San Luis Obispo: Pacific Gas and Electric today announced that it has entered into agreements to purchase 800 megawatts of power from two solar plants to be built on the Carrizo Plain. The agreements will make the northern Carrizo Plain around California Valley one of the state’s major producers of solar electricity. Three solar projects have now been proposed for the area, each with agreements to sell their power to PG&E. Senior executives with PG&E are calling the agreements a landmark in …