As of May 2021, nuclear power is provided by six licensed commercial nuclear power plants. The Pakistan Atomic Energy Commission (PAEC) is solely responsible for operating these power plants, while the Pakistan Nuclear Regulatory Authority regulates safe usage of the nuclear energy. The electricity generated by commercial nuclear power plants constitutes roughly 5.8% of Pakistan's electrical energy, compared to 64.2% from fossil fuels (crude oil and natural gas), 29.9% from hydroelectric power, and 0.1% from coal. Pakistan is one of the four nuclear armed states (along with India, Israel, and North Korea) that is not a party to the Nuclear Non-Proliferation Treaty, but it is a member in good standing of the International Atomic Energy Agency.