Solar photovoltaic (PV) system has been one of the most important solutions to reduce the dependence on imported energy supply and impacts on the environment in Taiwan. Recently, the building sector could be seen as a major driver for next years during climate change and global warming contexts. However, the world community has made only little and insufficient progress in the building sector in terms of energy savings and greenhouse gas reductions. Therefore, this research addresses the impacts of rooftop solar PV installations on residential and commercial buildings to identify the potential of GHG emissions reduction in Taiwan. The purpose is to analyze the influence of rooftop solar PV installation on greenhouse gases under the government policy focusing especially on Feed-in Tariff (FIT) and government subsidy for PV installation costs. Accordingly, a total of 11 policy strategies (five single and six hybrid policies) is proposed and how they influence the number of rooftop solar PV installations on buildings and corresponding carbon footprint from 2021 to 2050. The results show that the hybrid policy with FIT 1% increment and government subsidy of 50% can help achieve the lowest carbon footprint compared to the other policies. Besides suggesting the best policy to the government, this research also hopes to help raise the awareness of people on the benefit of using solar panels from both economic and environmental perspectives.

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