The Prospects for Residential Rooftop PV System Investment in Brunei

Brunei Darussalam aims to increase renewable energy share to combat climate change. This study proposed that the country invest in residential rooftop PV systems. It was vital to calculate the required PV system sizes for the residents, the economic feasibility of these systems, and estimate the projected total solar capacity and the national budget to achieve it. This work found that the PV system sizes are between 8.1 and 24.5 kW, depending on rooftop availability. Without government incentives, the payback period (PB) for users is 39.9–94.2 years, with an ROI of −73.5−37.4%. However, with government incentives, the PB is shortened to 20.7–48.7 years, with an ROI of −48.6–20.7%. Despite the benefits, installing PV systems remains disadvantageous for the residential sector. On the brighter side, if the government invests in residential rooftop PV systems, the total solar 146capacity would be between 551 and 1665 MW, with a budget of between BND530 million and BND2137 million. The results show that the country can easily reach the renewable share targets by investing in residential rooftop PV systems instead of conventional solar farms.