Installed power generation capacity has exceeded 82 gigawatts. According to Paven, The Energy Ministry news portal, thermal power plants account for 68,000 MW of the total.
The website said gas-powered units produce 25,000 MW or 31.6% of the total. It put the capacity of steam-powered stations at 20,000 MW or 16%.
Combined-cycled plants' capacity stands at 23,500 MW.
Close to 15% or 12,000 MW is produced from hydroelectric plants.
Paven said the nuclear power plant in Bushehr in the south and small-scale distributed energy resources (DERs) each produce 1,200 MW.
Renewable output has surpassed 670 MW.
Iran plans to add 5,000 MW of power capacity annually through 2022, the final year of its Sixth Five-Year Economic Development Plan.
Despite heavy reliance on hydrocarbons, the government in Tehran is taking measures to raise the share of renewables by 1,000 MW per year from below 700 MW at present.
Iran needs the higher output to shore up domestic power supply and increase electricity export to neighbors as part of a scheme to establish a regional power network.
Electricity demand reached an all-time high of 56,000 megawatts in summer. Over 60% of the power is produced by private companies.
The ministry says power plant construction deals, signed between 2013 and 2018, should add close to 20,000 MW of new capacity to the national grid.
The bulk of power infrastructure investments, $8.45 billion, are directed at thermal power plants that run on natural gas -- an abundant fossil fuel produced in Iran.
Close to 15,400 MW of new thermal capacity is expected to come on stream by 2022.
