Commissioned in 1994, Daya Bay is the Mainland's first commercial nuclear power station and also one of the earliest and largest joint venture projects launched under the Open Door Policy. The station comprises 2 x 984MW pressurised water reactor (PWR) generating units and produces around 15 billion kWh of electricity per year, of which 70% of its output is imported by CLP to Hong Kong. In 2009, this supply contract was extended to 2034.

In order to secure additional clean and cost-competitive energy for Hong Kong, an arrangement has been put in place to increase the import from 70% to around 80% from late-2014 to 2023. Currently, nuclear import from Daya Bay meets about 25% of Hong Kong's electricity needs.