Nasdaq: U.S. Interior Secretary Ken Salazar on Thursday approved construction of a large solar-thermal power plant proposed by NextEra Energy Inc. (NEE) for the California desert. The 250-megawatt Genesis solar power plant would generate enough electricity to serve 75,000 to 185,000 homes, the Interior Department said. The plant is the seventh large solar power plant the department has approved this year for construction on federal land in the U.S. West. NextEra said last week that its resources unit…