Sempra Generation believes in solar power’s bright future: The dust had barely settled at the company’s five-month-old 10-MW photovoltaic power generation plant near Boulder City, Nev., when it announced an expansion to quintuple capacity. The company claims it will create North America’s largest thin-film photovoltaic installation. Photo: First Solar Solar plant is next to Sempra’s 480-MW gas-turbine plant. The unit of San Diego-based Sempra Energy “won’t start construction until we have a [power sales] contract in hand,” says a Sempra spokesman. “We hope to start construction later this year.” Potential buyers could come from neighboring states, all of which have
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.