Cleary Gottlieb Steen & Hamilton, Covington & Burling and other firms advised on a long-awaited deal in which Puerto Rico selected a company to help it improve its battered electricity infrastructure.

This week, Puerto Rico announced it has chosen LUMA Energy, a joint venture between Houston-based Quanta Services and Canadian Utilities Ltd., with North Carolina’s Innovative Emergency Management Inc. assisting with administration of federal funding, to improve its power transmissions and distribution system. The process to select a private sector partner took more than 18 months.