Southern California Edison said it plans to buy power from two photovoltaic plants totalling 550MW, to be built by First Solar, the utility has announced.

As part of the agreement – which is subject to approval by state regulators – First Solar will build two thin-film solar PV plants in San Bernadino and Riverside counties, California, US.

The 250MW Desert Sunlight plant and the 300MW Stateline project are expected to supply enough energy to power 170,000 homes.

The financial details of the deal were not disclosed.