A UAV hit the Khor Mor gas field in Chamchamal, west of Sulaymaniyah, causing fires and halting production, leaving most of Iraq's Kurdistan region without electricity.
The regional electricity ministry said the attack knocked about 2,800 megawatts off the grid. Hor Mor supplies gas to power plants in Erbil, Sulaimaniyah and other areas.
The field is operated by Pearl Petroleum, a consortium that includes Dana Gas and Sahar Petroleum of the United Arab Emirates, Austria's OMV, Hungary's MOL and Germany's RWE.