Additionally Iran has a lot of spare capacity that has made the country a big exporter of electricity. For example about 25% of Afghanistan (Iran's eastern neighbor) is provided by Iran. There were talks of increasing exports by 400 MW to Pakistan (another neighbor in the east). Same thing in the west with Iraq and Syria.
There are also either smaller amounts exported or exports were for a couple of years to other neighbors such as Turkey, Armenia, Turkmenistan, Azerbaijan.

TEHRAN - Iranian Energy Ministry's Spokesman for Electricity Industry Mostafa Rajabi Mashhadi said on Wednesday the country has stopped electricity exports to neighboring countries due to the surge in domestic demand and only 50 megawatts (MW) of electricity is exported to Afghanistan at the moment.
According to Rajabi Mashhadi, the imports of electricity, on the other hand, have been raised to 650 MW and the country is currently importing electricity from Turkmenistan, Armenia, and Azerbaijan, ISNA reported.

The official had announced on Tuesday that the country’s power plants are currently able to generate only 54,000 MW of electricity which is nearly 12,000 MW less than the domestic power demand.