The Ontario government on April 8 approved renewable energy projects—worth nearly $9 billion to U.S. and Canadian firms—to produce 2,500 MW. The 184 projects fall under the province’s feed-in tariff (FIT) program, which gives solar power developers a premium fixed price of up to 80 cents per kWh for 20 years. Seventy-six of the projects are for ground-mounted solar photovoltaic technology, 47 involve onshore wind and 46 are smaller hydroelectric projects. The remaining projects involve biogas, biomass, landfill-gas, rooftop-solar and offshore wind applications. U.S. contract winners include Chicago-based Invenergy LLC, Recurrent Energy, San Francisco, and Nextera Energy, Juno Beach, Fla.
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.