RFERL:

The peak electricity demand in Iran and its neighbor clients Afghanistan and Iraq happens in warm months, but during this period last year Islamic Republic’s exports plunged due to high demand at home.

Its electricity imports from Armenia and especially Turkmenistan have been declining dramatically since September. This is possibly due to U.S. banking sanctions, which restrict Iran’s ability to pay its bills.

During international sanctions prior to the nuclear deal (2011-2016), Iran was also unable to pay for Turkmen gas and electricity imports, running up $2bn in debts.

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