An Iraqi official told AFP that the new sanctions waiver took effect last week.
The new four-month waiver comes just after a visit to Washington by Iraqi Prime Minister Mustafa al-Kadhimi.
Iraqi government officials have been pressing the US to renew the waivers as the Arab country is heavily reliant on Iran to respond to a growing demand for energy.
That comes as Iran has continued to supply gas and electricity to Iraq in recent years despite Baghdad’s failure to pay its energy arrears.
Exports have declined slightly in recent months both because of the arrears and also because of an unexpected surge in demand for energy inside Iran.
Iraqi authorities have urged Iran to restore normal gas supplies while waiting for a solution on the issue of arrears. That comes as terrorist attacks on electricity transmission lines in Iraq have caused more power cuts in the country in recent weeks.
Supplies from Iran currently account for almost a third of demand for electricity in Iraq, a country where many power plants rely on Iranian gas to generate electricity.