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Cost–Benefit Analysis of Rooftop PV Systems on Utilities and Ratepayers in Thailand

The Joint Graduate School of Energy and Environment, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand
Center of Excellence on Energy Technology and Environment, PERDO, Bangkok 10140, Thailand
Department of Building Engineering Services, Trier University of Applied Sciences, Trier 54293, Germany
Ernest Orlando Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
Author to whom correspondence should be addressed.
Energies 2019, 12(12), 2265;
Received: 6 May 2019 / Revised: 27 May 2019 / Accepted: 5 June 2019 / Published: 13 June 2019
Driven by falling photovoltaic (PV) installation costs and potential support policies, rooftop PV is expected to expand rapidly in Thailand. As a result, the relevant stakeholders, especially utilities, have concerns about the net economic impacts of high PV adoption. Using a cost–benefit analysis, this study quantifies the net economic impacts of rooftop PV systems on three utilities and on ratepayers in Thailand by applying nine different PV adoption scenarios with various buyback rates and annual percentages of PV cost reduction. Under Thailand’s current electricity tariff structure, Thai utilities are well-protected and able to pass all costs due to PV onto the ratepayers in terms of changes in retail rates. We find that when PV adoption is low, the net economic impacts on both the utilities and retail rates are small and the impacts on each utility depend on its specific characteristics. On the other hand, when PV adoption ranges from 9–14% in energy basis, five-year retail rate impacts become noticeable and are between 6% and 11% as compared to the projected retail rates in 2036 depending on the PV adoption level. Thus, it is necessary for Thailand to make tradeoffs among the stakeholders and maximize the benefits of rooftop PV adoption. View Full-Text
Keywords: cost–benefit analysis; rooftop PV; utility; ratepayer; Thailand cost–benefit analysis; rooftop PV; utility; ratepayer; Thailand
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Chaianong, A.; Bangviwat, A.; Menke, C.; Darghouth, N.R. Cost–Benefit Analysis of Rooftop PV Systems on Utilities and Ratepayers in Thailand. Energies 2019, 12, 2265.

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