Renewable energy is energy generated from naturally replenished sources such as sunlight, wind, tides, and heat from the earth’s core. Unlike conventional energy sources like coal, oil and other fossil fuels, renewable energy is plentiful and does not produce greenhouse gases during operation. High oil prices as well as climate change concerns have contributed to the promotion of alternative renewable energies as a solution to growing energy demand and diminishing oil supply.

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The Hong Kong Government aims to generate 1 to 2 percent of the City’s electricity supply using renewable energy by 2012. Consistent with this sustainable development strategy, new government buildings shall aim to achieve energy saving provided by renewable energy technologies. For example, new schools and educational buildings shall aim to achieve at least 0.5 percent of its annual electricity consumption using renewable energy. Prevalent technologies applied to Hong Kong’s public buildings include solar photovoltaic (PV) panels, solar hot water system, solar lighting, wind turbines, and bio-gas electricity generation.