Challenges and Opportunities of Business Models in Sustainable Transitions: Evidence from Solar Energy Niche Development in Lebanon

: Although business models presumably have a prominent role in socio-technical change remarkably little research has been conducted in this domain, more particularly in the context of developing economies. In this paper, we tap into this knowledge gap and study business model components and the challenges they face. We argue that the market value of renewable energy technologies will increase when new business models are implemented to overcome ﬁnancial and institutional challenges. We complement concepts of the business model literature with the insights from the sustainable transitions literature. This paper addresses two research questions: What are the challenges of business and ﬁnancial models in the transition towards decentralized solar energy driven systems? And what are the promising opportunities for new business models in a developing country context? To answer these research questions, we use a case study research design focusing on niche market development of solar thermal and solar photovoltaic (PV) technology in Lebanon. Data collection involved analysis of relevant text documents and expert interviews with 30 informants across di ﬀ erent groups of stakeholders. Data analysis involved qualitative interpretation of collected data against concepts from the business model and Strategic Niche Management literatures. The results show that business model challenges initially were highly dependent on donor aid, which contributed to the launch and network creation of niche markets. Later, a shift to micro-ﬁnance and business startup models was observed, which showed promising development. Knowledge transfer and community empowerment were found to play an important role in developing new business models that involve consumers more closely. As this development is expected to take place more often, we expect that new opportunity pathways will develop in developing economies like Lebanon.


Introduction
Renewable energy sources have a crucial role in lowering carbon emissions and creating a sustainable environment. Both scholars and practitioners are interested in understanding sustainable transitions, i.e., large-scale disruptive change of economic sectors, such as transport or housing [1]. The crucial role of business models is recognized in driving sustainable transitions [2]. For instance, an innovative business model can result in diffusion of sustainable energy technologies in developing countries [3], and as a result can facilitate the uptake of electric vehicle technology [4]. According to Geissdoerfer et al. [5], a significant approach to achieve competitive advantage and improve and challenges in developing countries, Harish et al. [26] argue that micro-finance banks can play an important role as a sales channel of business models for renewables due to their local market knowledge. This approach was found feasible because developing countries often suffer from low security of energy supply, thus resulting in frequent blackouts and poor power quality. Contextual factors like this make the introduction of new business models for intermittent renewable energy sources into such fragile infrastructures both a challenge and an opportunity [26,27].
Tapping into this research gap, Sarasini and Linder [2] propose including business model concepts into the research agenda of innovation studies. In the present paper we follow their suggestion and look to address the how business model concepts can complement socio-technical transition concepts. Next to discussing the relevance of business model concepts in sustainable transitions we provide an illustrative case study of solar energy niche development (i.e., solar thermal systems and solar photovoltaics) in Lebanon. The two research questions that are central to this paper are: (1) What are the challenges of business and financial models in the transition towards decentralized solar energy driven systems? (2) And what are the promising opportunities for new business models in a developing country context?
To answer the research questions of this paper several steps were taken. As a starting point we address a number of papers from both the transition literature and the business model literature, paying special attention to articles combining both areas of research and the role that business models have in sustainable transitions. The subsequent sections will address the theoretical background for this paper consisting of insights from both the literature on sustainable transitions and the literature on business models. Section 3 discusses aspects that the business model literature and the sustainable transitions literature have in common. Section 4 presents the research design and methodology applied in this paper, followed by Section 5, in which the results of the case study are presented. In Section 6 the results are discussed positioned in relevant academic debates. Section 7 concludes the paper and presents recommendations for further research.

Socio-Technical Transitions
Socio-technical transition theories are used to study the shifts within large socio-technical systems [28], transportation [29], and other societal utilities [30]. Transition theory perspectives employ a common set of concepts such as socio-technical systems, niches, regimes, and landscapes in order to study the dynamics of sustainable transitions. Transition occurs when these three levels interact, that is, radical innovations require protection to mature, and if a niche matures successfully it will cause regime to change which in turn builds up tension to even change the landscape level [31]. Socio-technical approaches to transitions often focus on the role that technology and technological innovation play in fulfilling societal functions. According to Schot and Geels [32], sustainable development might be achieved when the social and technical dimensions co-evolve.
Theoretical frameworks on sustainable transitions strive to understand and explain system transformation and address how to manage sustainable system transformations. Specifically, Strategic Niche Management (SNM), for instance, focuses on niche-level activities such as learning, networking, and visioning [11,32]. SNM argues that radical innovations require niches to be nurture in order to succeed [32]. Moreover, breakthrough technologies are likely to change mainstream markets, that consist of existing infrastructure, user preferences, and have multiple cultural meanings attached to it [11,12]. These technologies will start to develop within niches, that can be seen as protective spaces, and that operate within a unique set of rules [7]. Niches take the form of protected spaces where experimentation occurs and are expected to result in innovations. There are certain functions that spur innovations, and functions that are associated with the diffusion of technological innovations [33]. Examples pertain to research and development, financing of the innovation process, and fostering new fields for innovation development (such as entrepreneurial experimentation).
From a socio-technical perspective, technological innovations themselves play a key role in fulfilling societal needs, but the functioning of a technology in a socio-technical system basically depends on other elements, such as regulations, user practices, or cultural meaning [16]. That is, transition does not only involve changes to the technology itself, but also changes to the environment in which it has a function, and other elements of a socio-technical system, such as user practices and regulations [34]. In a similar sense, a shift towards sustainable development requires drastic change in both production and consumption structures and patterns [35].
Although transition research mainly focuses on the role of technological innovations, it is recognized that technological innovations alone are not sufficient to induce socio-technical change [35,36]. Similarly, the International Energy Agency (IEA) [37] argues that market uptake of energy efficient technologies is not moving fast enough, assuming that when the industry and the residential sector adopt such technologies it will reduce the energy demand considerably.
The niche processes of solar energy technology require business models that handle perceived risks and remove the high investment costs and space requirements of solar energy systems [7]. Moreover, business model innovation is considered an important driver in speeding up the low carbon power system transition [14].
From a market perspective, renewable energy technology requires business models that have the ability to effectively commercialize them and make them compete with available-mostly conventional-technology. Therefore, given the importance of the activities niche actors have in disrupting socio-technical regimes, we will reflect on the business model concept for transition.

Business Models
Business models play a significant role in capturing the value of an innovative idea through linking it to customers' needs [10,38]. Teece [10] defines a business model as the design or architecture of value creation, delivery, and capture mechanisms. In a similar vein, Bidmon and Knab [16] argue that business models address the process by which firms create and capture value. Business models have received various definitions and have been applied from different theoretical perspectives [39]. Despite the fragmentation among definitions, business models are described as market devices that shape how an organization creates, delivers, and captures value [40]. However, there is certain agreement on the basic conceptual meaning of a business model that describes how firms create and capture value [36]. Business models not only deal with linear value creation of a firm from suppliers to customers, but also with complex transactions within value-networks concerning value creation for multiple parties in those networks [40]. Osterwalder [41] provides a means to differentiate between different business model types by constituting nine building blocks. Among those, the product block includes the business area and the value proposition that is offered to the market. Another block is the customer interface, with the aim of identifying targeted customers, selecting distribution channels to reach them, and building relationships with them. Infrastructure management includes the network that the firm uses to deliver created values. The financial blocks include the cost structure and revenue streams. Osterwalder and Pigneur [42] address the business model blocks that business enterprises apply to create, deliver, and capture value.

Business Models and Socio-Technical Transitions
Bidmon and Knab [16] base their business model definition on the functional perspective of transforming resources into outcomes. They propose that the core function of a business model within a socio-technical system is to commercialize innovative technology developed at the niche level. In this sense business models are used in non-technological niches that have a higher stability level than niches that address (immature) technological innovations. Business models also contain deep and robust expectations that are well-articulated and communicated. As such they can be seen to entail an advanced stage of second order learning that involves social networks with a considerable breadth. A major component of a business model is generating value for customers by finding a solution for problem they encounter in their lives [43]. However, to understand and apply a business model perspective, Provance et al. [44] argue that contextual factors should also be taken into consideration.
Bidmon and Knab [35] propose that business models act as a crucial point of communication between actors. Thus, they support the articulation of visions and expectations of certain technologies. This allows the articulation of value creation and the value capture mechanism for a technology among innovation actors. In addition, business models are less likely to have a role in building social networks [41], but may increase communication between different innovation network actors, which will subsequently support learning processes and social network formation, and by doing so is more likely to attract consumer attention and investors [13]. Furthermore, business models improve learning processes between organization by acting as a knowledge hub [35] that creates competitive advantage for new technologies and attracts new actors to the network [14]. Hence, once a technology is coupled with an innovative business model it becomes more likely to be adopted by (a greater pool of) actors, and is therefore more likely to diffuse across markets.
Bidmon and Knab [16] explain that improvements occurring at business model levels will result in change in technological niches contributing to the emergence of dominant technological designs. This means that actors should not cling too much to existing business model logic (e.g., relying on donor funds in the case of firms in many developing countries), but should rather pave the way for new business models to emerge [45].

Characterization of the Business Model in Solar Energy Niche Cases
Boons et al. [46] address the importance of business models and argue that they should even be considered part of socio-technical systems. In order to create a higher market uptake of renewable energy technologies, better infrastructures, more customer oriented regulation, and support mechanisms are required due to their direct influence on the success of a business model [7].
Just as niche experimentation is designed to help a given niche compete with conventional technologies in markets, so is experimentation in the business model [10]. Transition theories discuss the importance of entrepreneurial activities in initiating change and supporting the diffusion of innovations [2]. These activities are referred to as 'entrepreneurial experimentation'. This includes testing the potential of new technology to disseminate "new knowledge, networks, and markets into concrete actions to generate new business opportunities" [9] (p. 421). Experimental activity will result in attracting a range of new stakeholders, with new ideas and new capabilities [2].
Koubaa [47] argues that entrepreneurial activities in developing countries suffer from various challenges such as access to finance, lack of investor protection and government regulations, political instability, and access of information for new business ideas. These challenges strongly influence the entrepreneur's ability to exploit opportunities. Thus, without experimenting and learning about a business model, many market opportunities are basically missed [43].
Just as demonstrations and experimentations occur at the niche level business models are also shaped in experimental ways. As a starting point, hypotheses are generated to be tested later, to be elaborated and reformulated [48]). That is, after experimentation is done, further evaluation, research, and development take place to address market and consumer needs. This shows that business models play a significant role in facilitating various activities in internal niche process within the SNM framework. According to Tolkamp [43], SNM is important to business model development because it provides guidelines for business model developers on how to organize certain niche activities. For the purpose of defining a business model just like processes taking place at the niche level, a learning process of trial and error takes place regarding business models. Because a business model takes the form of an experimental process, it does not only facilitate single loop learning, but also double-loop (second order) learning [49]. Once certain lessons are learned, the likelihood increases that a more customer oriented business model will develop [10]. This also allows for integrating the three core internal elements of the SNM framework (i.e., aligning expectations, network formation, and learning) into the business model perspective.
When perceiving the business model perspective from a broader societal context it is contextual factors that affect the success of business models [7,10]. Since a technology depends on its intended consumers can be much more than just end-users of energy involved in the process of gaining more knowledge and value [50]. However, even when business models focus on fulfilling consumer needs, behavioral challenges might hinder market uptake [38]. For this reason, gaining a better understanding of customers' behavior is likely to increase their awareness of environmental problems [51]. For consumers to use energy efficient technologies, a better fit with the social context and lifestyle of potential end users is required [52]. However, the assumed benefits of these kinds of technology need to be communicated to the consumer before it can be imagined, perceived, assessed, and eventually accepted and used.

Research Design and Methodology
A case study research design is used to provide new insights on the challenges and opportunities business models for sustainable niche market development encounter in a developing economy context. This research design was selected for its strength to address and assess rich, descriptive data of a specific phenomenon under study in its context resulting in comprehensive understanding [53]. The case study of business models in the Lebanese solar energy market serves here as "an empirical inquiry that investigates a contemporary phenomenon within its real life context; especially when the boundaries between the phenomenon and context are not clearly evident" [54] (p. 13). As the aim of this paper is to understand the opportunities and challenges that business models have in the transition literature, we look to explore similarities between the two literature concepts and to reflect on the core concepts [2]. We particularly address risk association that manifests with business models in developing economies [55,56].

Case Study Selection
The Middle East and North Africa (MENA) region is rich in solar radiation, thus making adopting solar energy technologies potentially attractive [57,58]. However, to our knowledge, no empirical studies have reflected on the sustainable transition framework and business models in developing economies of the MENA region. Because of this academic knowledge gap, Lebanon is used in this study as an illustrative case. The country has abundant solar radiation yet relies on fossil fuels imported from neighboring countries for energy generation. Moreover, Lebanon has unstable political and economic conditions, thus showing a hostile environment to green innovations [59]. Despite the ongoing national initiatives in the country, Lebanon needs new business models that involve consumer participation to develop renewable energy technology markets. For these reasons, this country is selected to present a case study of the complexity of market development and to serve as an example case for other developing countries of similar geo-political and socio-economic dimensions.

Data Collection and Analysis
To answer the questions on the challenges and opportunities business models encounter in sustainable transition in a developing economy context, a qualitative research approach is selected. This research approach aims to answer research questions of "what", "why", and "how", taking into consideration the social context to provide a rich understanding of the problems and potential in a given area, requiring the collection and analysis of detailed, rich, contextualized data [60].
For data collection we relied on two previously conducted empirical case studies that address the diffusion and transition of solar energy technologies in Lebanon [19,20]. Face to face, semi-structured interviews were conducted between February and March 2017, that lasted between 45 to 60 minutes each. Interviews were conducted in the English language and held with 30 informants across different groups of stakeholders (i.e., consultants, solar energy technology providers, consumers, NGOs, financing, public sector institutes, and project managers). To generate a rich understanding of the solar energy niches and the development of business models in the Lebanese market, the primary researcher of this study (the first author) participated in several solar energy project meetings. Data triangulation of different sources of evidence [61] was applied as interview data were complemented with information about implemented and alternative business models from secondary sources, such as online publications and newsletters and other professional publications from ongoing programs (implemented by the United Nations Development Program) and semi-public institutions (such as national energy efficiency center) in the renewable energy industry.
As a first step in the data analysis we brought the business model and SNM perspectives together following a literature study of the available academic literature (as presented in Sections 2 and 3). Then, we built on a qualitative analysis of the case study on the development of solar energy niches in Lebanon. This serves as an illustrative example that describes previously implemented and potential future business models in a developing economy and their interconnection with niche development.
The key terms of analysis were based on key themes of the business model canvas [42] and core concepts presented in the literature study, and the illustrative examples against these theoretical propositions were later evaluated.

Business Models of Solar Energy Niches in Lebanon
This section starts with presenting business models and their respective challenges applied in the Lebanese context in which the solar niche development took place, summarized in Table 1. Building on this, the main elements of the business model relevant to the Lebanese context are summarized in Table 2. These elements provide similarities with the transition concept as discussed earlier in the literature section. Furthermore, understanding the business model components will provide a clear direction towards addressing the opportunities that pertain in a developing country context, in particular Lebanon as discussed in this section of this paper. The demonstration of these projects helped increase the technical expertise of technology suppliers who were engaged in installations [19]. On the other hand, the demonstration projects at the niche level increased awareness of consumers. These projects pushed for financial models and more sustainable models in the solar energy market.  With the start of the solar thermal niche, investment projects were supported by non-governmental organizations and donor aid from countries like China, Spain, Turkey, Sweden, and Greece in the form of donations of individual systems from the nation states [62]. In 2009, one of the key projects was a United Nations Development Programme (UNDP) funded project which installed large scale solar thermals and PVs on public buildings. The installations were fully funded by foreign investors. This triggered the government to launch financial incentives for household and corporate installations. The demonstration projects and workshops funded by foreign investors increased the technical knowhow among technology providers [19].
To move away from fully funded projects, two new funded projects (Med Solar and Country Energy Efficiency and Renewable Energy Demonstration Project for the Recovery of Lebanon (CEDRO4)) facilitated a new financial model that required the private sector to cover their investments [63]. Unlike the pure grant funding, this approach guaranteed a more sustainable business model in order to open up new market opportunities: a gradual shift from completely grant-financed solar energy projects to a more sustainable financing model which also increasingly engaged the private sector to finance these investments. This shift was based on the need to change ongoing market approaches, thus, meeting the customers' needs.
A Global Environment Facility (GEF) funded project on Small Decentralized Renewable Energy Power Generation (DREG) provided a complementary grant co-financing scheme as an advancement to the previous financing mechanism [20]. This project triggered a transition away from pure grant-funding for renewable energy investments towards more sustainable business models to open up new market opportunities and increase commitment of end users. Thus, proving that new models that take into consideration the needs, capabilities, and challenges facing end users need to be considered.
The interviews and reviewed documents identified the following historical and new approaches (showcasing finance and knowledge transfer). In the past, the finance approaches involved active shielding, such as full donor support by international organizations. The funders were able to fill a gap that the Lebanese market was not ready yet to fill. This shows a need to have creative solutions in place that are tailored to the end users' needs. The approaches that were used are presented in Table 2.

The Donor Aid Model
The donor driven approach was the first form of business models applied in Lebanon. Although it did not ensure financial stability in the implemented projects, the donor aid business model contributed to the launch of the solar energy market. This form of business model relied on foreign funds, which did not ensure a sustainable financial flow as priorities of the funder shifted and the systems implemented depreciated over time. The end users (both in the commercial and the residential sectors) directly benefited from the installed system either with low cost or without cost. End users were set fully in charge of the system maintenance and usage. One of the drawbacks of such business models is low commitment of end users towards maintaining the solar energy systems in a good functional state. The value proposition of this business model promised end users no investment cost and full ownership of solar energy systems. However, quality and country of origin of the systems was limited to donor countries, offering customers limited choice.
The role of the donor aid business model was to successfully introduce the solar energy systems to the Lebanese market and increase the knowhow of local technology providers. The key resources in this business model pertained to the financial power of the funders, the products of technology providers, the knowhow of the project managers, and the underlying network of actors involved in the projects' implementation. The key activities were finding potential end users for systems' installations and the actual interaction between different local and international actors, thus resulting in knowledge transfer from one party to another. The distribution channel to deliver these activities and to ensure interaction between network actors themselves and potential customers, was done through the managing body of funded programs and the National Conservation Center. In its early stages, the customer segment of this business model mostly involved the residential sector. At a later stage, industry (i.e., public utilities) also became involved.
The donor funding created a protective space for the niche technologies. This was critical at the first stages of the products launch because it was aimed at reducing the risks associated with early investment in new business models. The early donor finance model can be regarded as supportive to organizing experiments that contributed to creating a learning environment and a basis for future finance approaches. The experiences and challenges that the solar energy project encountered included limited awareness and expertise by both end users and suppliers, and low performance of systems due to low quality (also related to the country of origin). This can be seen as a base from which new and more sustainable approaches were developed. Arguably, this can be viewed as second order learning taking place.

Locally Based Collective Project Business Models
Learning from these experiences, a new finance model paved the way to provide end users with a more active role in localized projects. Actors aimed at creating a more active role for end users. In this model, customers would finance their systems through low interest loans supported by the government. Yet, to make the investments more attractive to customers, a foreign grant of up to 25% of the total investment was to be provided. This shift was based on the UNDP and funder specifications to engage the private sector in investments and to ensure their commitment to the projects through financing their own investments. This proved to be essential to increase end users' commitment to the installed systems. The locally based collective business model was mainly applied to private corporations (over different industrial sectors) and did include installations of large scale decentralized solar PVs. The financing process would then start by evaluating projects requesting the smallest grant contribution for the projected energy generation, which would then be prioritized. The customers' proposals specify the financial and technical specifications of the systems along with the calculations of the annual yield [64]. Besides this, the National Conservation Center would approve and verify the proper installations of the systems prior to releasing the foreign grant. By the end of the projects' implementation term, the system would fall under the complete ownership of the end user who in turn becomes responsible for its maintenance.
The value proposition of this business model was mostly based on the ownership of a clean energy system with relatively acceptable cost of investment given the low interest loans and the grant. The most common form of inter-actor interaction was between technology providers, project managers, and funders on the one hand, and between the technology providers and the end users on the other. Technology providers were interested in taking part in large-scale decentralized projects managed by UNDP provided by foreign funds. This was expected to improve their market status and increase their technical knowhow. As from 2014, technology providers taking part in demonstration projects promised potential customers a relatively low cost and high quality solar system. After getting approval from program managers and funders, the providers had to initiate contact with potential end users to also receive their approval and start the implementation process. However, various coordination activities (such as reporting about potential customers or providing technical and financial studies of investments) took place between the technology providers and the project managers. The distribution channels to cover these activities were managed by project managers who acted as intermediaries between the funders on the one side and the technology providers and customers on the other side. One-on-one interactions between actors of each side and the intermediary occurred through various monitoring and coordination meetings. The most vivid challenges in this model pertained to the absence of clarity for the selection process of beneficiaries. Although the end users benefitted from the technical expertise of installers, the selection of locally based firms that would benefit from the system installation was mostly reliant on the capacity within available programs.

Micro-Finance and Entrepreneurship Project-Based Business Models as Promising New Models
Interactions and actor network building were established through previous finance approaches (i.e., donor aid and locally based business models). This was part of a nurturing process resulting in niche market development. However, the visions of the actors were not aligned to proper nurturing of the niche in all of the stages. This was observed through the various projects implemented simultaneously in the market. The actions of actors were coordinated to meet the desired outcomes of projects instead of trying to find a common vision that would serve overall niche development. Knowledge exchange started with donor-based networks but was eventually promoted with locally based projects and semi-funded grants. The funders supported network formation, knowledge transfer, and end users' involvement. At a later stage, the funders started supporting the community involvement through the incubation centers, creating ideas, and supporting the development of networks.
Micro-financed business models were based on 'in cash' investments and subsidized loans. This resembled residential and corporate end users who own and finance solar energy systems with full responsibility for installation and maintenance. Unlike the previous two business model types in which project managers are typically held responsible to coordinate with technology providers for the installation of solar systems, the end user is solely responsible for the installation of the systems in the micro-finance business model. This business model aims to reduce high upfront costs, mitigate financial risk, and increase end users' access to renewable energy technologies. Thus, solar thermal technology financing mechanisms in this model would act as a catalyst for market development. In this model, end users are subjected to subsidized loans (at a 0% interest rate). In the case of solar thermal systems in Lebanon, residential end users received a $200 grant for the installation of a qualified system from a selected technology provider. The bank then deducted this amount from the final installment of a qualified solar system. In the case of collective solar thermal and solar PVs (small and large scale), another financing mechanism (through the National Energy Efficiency and Renewable Energy Action-NEEREA) was launched to the market in 2010. This financing mechanism offered end users subsidized loans for a period of up to fourteen years with a 0.6% interest rate. It was offered at commercial banks and supported by the Central Bank of Lebanon, targeting residential, commercial, and industrial users for all renewable energy systems.
The initiatives launched aimed to accelerate the uptake of renewable energy systems installations in the Lebanese market. This was verified by the main value proposition used in this type of business model being "Energy for free, and a solar thermal system for every household" (in the case of residential solar thermal systems). Although this model played a significant role in developing the renewable energy market in Lebanon, it suffered from problems, such as lengthy procedures (two to three months). This challenge was demonstrated through the application process, for instance, in order to apply for a NEEREA loan, potential end users were requested to provide the commercial bank a technical report through a technology provider which included a feasibility study (for installations up to 20 Million USD) which should include complete technical and financial analyses. In the case of reports that were submitted well (and found eligible), micro-finance institutes would provide guarantees for the bank, thus making the lending process less risky for the bank through ensuring the reliability of customers in re-payment of the loan. In turn, the commercial bank would send the report to the National Conservation Center for revision.
The role of this model was to hold customers responsible for finding and contacting technology providers and for selecting the commercial bank that would grant the loan for solar system installation. Furthermore, technology providers would act as intermediaries between customers and banking institutes in the case of both small-and large-scale solar PV installations.
The funders gave more attention to the need for capacity building and creation of a market catalyst. The Strategic Hub for the Analysis and Acceleration of the Solar Sector in Mediterranean region project (SHAAMS) in 2014-which was partly implemented by Berytech-supported innovative ideas from entrepreneurs through a foundation that allocates a specific fund for research and development, supporting innovation adoption in the Lebanon. This approach triggered another form of business model that enables entrepreneurs and individuals to be part of the system to create change and involve consumers more in the market, and more specifically in knowledge transfer. For example, crowd powered startups created platforms that are aware of the particular space and financing challenges that the Lebanese consumers have encountered in the past few years. These platforms would invite customers to find the right renewable energy solution for their available space and budget, shop for a loan, and hire a design office, equipment supplier, and contractor to get solar panels installed on rooftops. These startups act as one-stop-shops for designing, securing, and financing. Individual approaches were applied by a number of municipalities in small villages in the south of Lebanon where they took personal initiatives for the community to collaborate with banks to ensure financing and connected with local communities to increase knowledge transfer. Municipalities then ensured implementation of solar systems on roof tops of residential consumers, via coordination with the aim to finalizing the financial processes. This was expected to pave the way for a new level of this model that would use digital technologies to link users to their respective municipality. PV systems would be installed on individual owned land properties, and the systems would operate under the approval of the respective municipality. The municipality would then become responsible for providing users with a map of the PV systems nearby. However, further empirical research is required to provide more precise quantitative data to measure the feasibility and success of such a model in the Lebanese context.

Comparative Analysis of the Three Business Models
Based on the overview of challenges addressed in Table 1, and the specific business model characteristics addressed in Table 2, we deduce the interrelation between the two. The challenges manifested in the donor based business model mostly pertain to limited awareness and expertise in market. The key partners involved were limited to specific donor countries, with limited learning experience and limited exchange of technical expertise (often restricted to mere intra-project expertise exchange). This was reflected in the key resources provided for local actors, which suffered from low diversity in partners. The locally based business model encountered different challenges. This model had more diverse key partners, however, having access to these partners as an end user is challenging, more particularly in terms of getting access to small local networks that are active in installing solar energy technology. These challenges were reflected through the lack of clarity on the selection of beneficiaries. The contact with reliable installers and writing a detailed and competent proposal to receive funding for medium-sized system installations required more clarity to improve the value proposition. Lastly, the challenges micro-finance business models encountered pertained to the lengthy process procedure for acquiring the necessary funding, and the misalignment of visions held by different actors. Although the key resources in this business model resulted in an interactive learning experience among local actors, the revenue streams encounter the challenge of having more bureaucratic procedures to obtain subsidy in addition to the challenge partners have in aligning various initiatives at the national level.

Discussion
To understand the diffusion of renewable technologies one needs to study the economic, environmental, social, and technical aspects of a technology [62,63]. Engelken et al. [21] showed that research from developing countries focuses on simple business models with attention to financial aspects without addressing many other important pillars of business models. On the contrary, most business model research that focused on industrialized countries revealed complex business models for renewable energy technology, stressing the need to differentiate between business models across regions and economic statuses. In particular, factors driving or hindering renewable energy technology diffusion are highly specific to geographic regions.
By mapping the business models applied and the ongoing challenges in the Lebanon case, we revealed that new business models create opportunities through presenting aspects that are similar to SNM. Both business model development and SNM depend on learning and experimentation (in line with [7]). In this sense, SNM can provide insights to the business models to help them broaden their context of operation and tackle ongoing market challenges.
In a similar vein, the Lebanon case revealed that business models contributed significantly to the development of a solar energy niche market. Whereas the government provided support in the form of financial subsidies, international funders created the knowledge and financial feasibility for installations, and the community initiatives prepared the market to make the shift. Heavy reliance on funders was reduced with micro-finance and alternative business models where local communities and incubation centers focus on creating more individual-based solutions to renewable energy uptake. This was either done through municipalities in small villages, or via entrepreneurs providing solutions to the small-scale barriers. The micro-finance business model was based on customers' decisions to make the investment and on their knowledge. However, this confirms the need to change from a donor-based to a market-based perspective [46,64].
The results also show that one of the important aspects in the Lebanese solar market development was the transfer of technical knowhow during local training sessions and workshops from firms and experts from developed countries. The importance of the learning process was also reflected in the shift from donor aid business models to local collective business models. Thus moving away from fully funded models to create more sustainable markets. Therefore, we agree with Doganova et al. [13], who address the importance of communication between different innovation network actors, which enriches the learning process and social network formation, but also succeeds in attracting new investments. Similarly, we agree with Martinot et al. [46] who argue that in order to increase the growth of renewable energy markets in a developing country, an increased technical knowhow is required to develop technologies and the supporting industries. This transfer of knowledge and expertise helped to establish a solid technical ground in the market. Yet, to achieve a sustainable development on the national level, a shift to innovative business models for renewable energies might result in a strong 'business-society relationship' [65]. Addressing the social context, creating more active roles for consumers in the market through business models that address ongoing challenges is a crucial component to sustain solar energy niche markets in Lebanon.
A common approach for business models in developing countries involves targeting the customer side, where products and services match the customers' preferences [24,25], such as social entrepreneurship business models addressing the same customers [3,23]. Another way is by involving consumers as information sources [66] so that users will be more likely to innovate and aid in the development of a certain technology in the market [67]. This segment of users is what Rogers' diffusion of innovation model defines as 'innovators' [68], and emphasizes that users might engage in having different roles such as co-producers (pro-sumers) or innovators [44].
We agree with Huijben and Verbong [7] that in order to achieve higher market uptake of renewable energy technologies, better infrastructure and more customer oriented mechanisms need to be applied. However, the challenge that surrounds certain business models in developing countries is the absence of stable energy supply (often resulting in numerous blackouts) and the lack of a regulatory framework that ensures the promotion of individual and entrepreneurial opportunities in the concept of trading electricity among neighbors or in certain neighborhoods. This situation offers interesting opportunities for more innovative business models with value propositions supporting decentralized technologies and less reliance on inadequate centralized systems. This makes it difficult to implement innovative business models for renewable energy sources into fragile infrastructures [26]. Such is the case pertaining to the unreliable Lebanese electricity grid and the bureaucratic system surrounding it.
Reflecting on the Lebanese solar energy market, a crucial dialogue occurred between a key banking institute and a consumer representative organization. In addition to the bank's core function of providing flexible loan terms to the customer, the banking institutes were indirectly reflecting on the quality of the system by showing the reports to the National Conservation Center, which monitors the entire process. In an effort to target new customers and expand their business models, technology providers highlighted the importance of micro-finance [46,69,70]. Micro-finance institutes that are non-governmental organizations (NGOs) act as a point of contact with the end users that not only provide customers with loans, but help firms to identify prospective customers and act as sales channels for renewable energy technology supply [26]. As reflected in the Lebanese case, corporate end users were targeted to provide a feasibility study for the banking institute granting loans for collective solar energy systems in cases where enterprises, municipalities, and non-profit organizations acted as a guarantee for the banks to process the funding.
As shown in the Lebanese case, from a business model perspective, applying a new value proposition might target a different customer segment. The case revealed that the segment of collective solar systems is still emerging, and consumers are not yet in the phase of taking active new roles that will help the niche to develop and scale up. This takes into account the importance of customer needs regarding their social position and lifestyle [52].

Conclusions and Implications
In this paper, two research questions were presented: (1) What are the challenges of business and financial models in the transition towards decentralized solar energy driven systems? And (2) what are the promising opportunities for new business models in a developing country context? In order to answer these two questions, we conducted a literature study and analyzed solar energy niche market development in Lebanon.
Results show that business models used within or even beyond niches represent change and development in markets [2]. By combining insights from transition and business model scholarship, new knowledge can be generated to develop research agendas and support policy makers. Business models through their various components not only have an important role in sustainable transitions in developed countries, but also in developing countries. In the case analyzed, this was observed in various activities that match the shaping of expectations and learning at the niche level.
Key challenges observed in the Lebanon case reflect the importance that should be given to certain business model characteristics. This results in an improvement in the various criteria of business models such as infrastructure management, and addresses product, customer, and financial aspects. As represented in the results section, the locally based and micro-finance business models were creating a higher value for customers and an improvement in the infrastructure and financial components.
Besides showing the contribution of the financial components of business models, the results show the importance of enabling entrepreneurs to create new business models given the available financial incentives in markets. In the Lebanon case, it is the promising opportunities of business models that focus on the potential that entrepreneurs have. However, to further insights in a developing country context, new research avenues addressing the role of entrepreneurs in creating knowledge hubs that attract local stakeholders (i.e., consumers and business companies) or organizing frequent discussions that address sustainable consumption tips regarding the use of new technology can be explored.
A particular challenge with the solar niche market development in Lebanon pertained to the unavailability of space. Therefore, it is important to start thinking about initiating projects that involve neighborhoods and households with spacious roofs, that can collectively use or finance a solar PV system, for instance by using community shares. As long as subsidies are high it is not likely that pressure will be created to come up with new market concepts to support higher uptake. Regarding solar PV technology, a shift from a centralized to a decentralized technological paradigm, and a societal shift from passive to active users or 'prosumers' is basically needed. This requires the need to address values in business models. Wainstein and Bumpus [14] showed, for instance, that having new value propositions in place allows for reaching different customer segments, like having shared ownership of collective solar PV. An exemplary business model concept would be that of citizen-led renewable energy cooperatives in which public values like equality, justice, community well-being, and ecological sustainability, but also financial efficiency and yield, apply, using a model in which the cooperative gives out shares and members become shareholders and gain ownership and influence in the governance and decision-making of the cooperative that runs one or more collectively owned solar PV parks [71].
Putting the key elements of business models addressed in the present study in perspective, we argue that prospects in developing countries like Lebanon are primarily based on micro-finance and the roles entrepreneurs take. For instance, the donors were observed to have shifted their expectations to focus on supporting socially oriented private enterprises, providing a key opportunity for new ideas and start-ups. Therefore, we think that political support for entrepreneurs is likely to enable development of new business model concepts. In light of ongoing challenges and the weak and unstable role that (national) governments have, creating a bottom-up social innovation approach will respond closely to community needs and interests. For instance, the need for creating sustainable business models through community-based initiatives-like renewable energy cooperatives-that will be the linking point between finance providers and the end users. The concept of launching large-scale renewable energy producing systems for large groups of end users might also help to solve issues pertaining to space availability problem and high investment cost. Yet, due to the individualistic culture that many of the end users have (particularly in Lebanon), setting up community-based initiatives may prove troublesome, especially in urban environments. However, there is a need to establish trust among individuals contributing to this type of initiative. For instance, a future potential business model that involves peer to peer trading was discussed by CEDRO, mentioning that it could have good potential given that the right regulatory scheme is in place. This requires further research to determine the essential technical infrastructure related to information and communication technology. To achieve higher adoption rates in the Lebanese solar energy market, it is important to develop and analyze policy, and for policy makers to select and adopt policy instruments that not only target end users (from the demand side), but also technology suppliers (from the supply side) and other agents in the wider supply chain and socio-technical system.
Limitations to the present study amongst others pertain to the particular country selected as a single case study for research. To address this issue, we recommend a comparison of business models used for solar PV niche market development between multiple developing economies that can provide comprehensive real life examples of common opportunities and pitfalls of business models. In addition, further insights are necessary to address the role consumers and enterprises can play in response to innovative business models. Future research may also address tackling of limitations that customer-centered business models face in developing countries, particularly in relation to the cultural, political, and infrastructure dimensions. Future research could extend the analysis of the present study beyond the financial and knowledge transfer components. Researching interrelations between digitalization and new business models in the renewable energy market might provide useful insights into involving consumers in the transition process in new ways.