So, what is Singapore's plan for harnessing renewable energy?
A lot of renewable energy is not really available here.
As per this source,
Singapore's high average annual solar irradiation of about 1,500 kWh/m2 makes solar photovoltaic (PV) a potential renewable energy option for Singapore. However, we face challenges to the use of solar energy in Singapore. We have limited available land for the large scale deployment of solar panels. In addition, the presence of high cloud cover across Singapore and urban shading poses challenges such as intermittency.
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The report on Singapore Energy Statistics says that
The adoption of solar PV systems in Singapore continued to accelerate in 2015. Grid-connected installed capacity of solar PV systems sharply increased from 26 MWac in 2014 to 46 MWac in 2015. This increase was driven by 305 new installations in 2015.