By 2012, Iran had roughly 400 power plant units. By the end of 2013, Iran had a total installed electricity generation capacity of 70,000 MW, which had been increased from 90 MW in 1948, and 7024 MW in 1978. It is planned to add more than 5,000 MW of generation capacity annually to the power grid, which will almost double the total power generation capacity to 122,000 MW by 2022. The government of Iran plans to privatize 20 power plants by September 2010. Iran's peak demand for electricity was 45,693 MW during the summer of 2013.