Hong Kong Polytechnic UniversitySolar radiation level in Hong Kong is high, while the solar power generation capacity only accounts for 0.1% of the total power generation capacity in Hong Kong. The “On-grid Electricity Price” later promoted by Hong Kong Electric Holdings, Ltd., and CLP Group was planned to purchase power from power producers as per the current electricity price, to encourage Hong Kong residents and enterprises to install solar panels and other renewable energy power generation facilities in their local places.

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75% of the rooftops of houses in Hong Kong could be installed with solar panels

As investigated by Hong Kong Polytechnic University, among all the 310,000 buildings, 75% of the rooftops of houses could be installed with solar panels. Annual power generation capacity could be 10.7% of the local power consumption. However, the current solar power generation facilities are mostly installed in land of government use or official government buildings, while the power generation capacity only accounts for 0.1% of the local power consumption.

Cost-returning period of the small system needs 30 years.

Take rooftops in villages as example, rooftop of a typical house of 70m2 in villages of Hong Kong could be installed with 1.6kw small rooftop solar system, which could annually produce 1560 degrees of power, equaling to 1/3 of average power consumption of a family in Hong Kong. However, even the special administration government exempt owners to install solar PV facilities on rooftops, only 9 of the solar power system installed on rooftops of houses in villages could be connected to power grid. 

Not enough popularization of solar energy production may be related with lack of economic factors. A 1.6kW small rooftop solar PV system may cost 50,000. While users could only save cost for electricity expense for about 150 yuan, meaning the cost returning period would be as long as 30 years.

“On-grid Electricity Price” mechanism could provide trigging factors for house owners or business owners, while the power company shall purchase the power with price higher than the standard power price from the people owning the installed renewable energy power generation system, to shorten their cost returning period. If a village house owner sell the power to the power company at 5 yuan for each degree of power, and then pay 1.1 yuan for each degree of power, he would own profit of 4 yuan.