According to the Outlook of Renewable Energy in America report of the American Council on Renewable Energy, the United States by 2025 could have 248 GW of wind power and 100 GW of geothermal energy, in addition to 287 GW of other renewable energy, power and fuels. "Renewable energy will not be a 'niche' source of America's energy in 2025," according to Robert Detchon, executive director of the Energy Future Coalition. States such as Texas, Wyoming, New Mexico, and Colorado, where much of the increased wind generation is anticipated, and Nevada, California and Oregon, where much of the increased geothermal generation is anticipated, will likely require more transmission to deliver the renewable power to markets where it is needed.
Utilities and governments in Europe, China and the United States could spend up to $150 billion on wind projects over the next five years, and the United States alone could invest $67.5 billion by 2015 to produce an anticipated total of 45,000 MW of wind capacity by that year. According to a May survey conducted by the Geothermal Energy Association, up to 2,455 MW of new geothermal power plant capacity is currently under development in the United States, with 251 MW of capacity currently under construction. Investment giant Merrill Lynch Commodity Partners recently closed on a $35 million deal with geothermal power developer Vulcan Power in order to finance the development of properties in California, Nevada and Oregon. Calpine recently announced its intention to boost output at its Geysers geothermal facility in California to approximately 800 MW, and Nevada Power signed a 20-year power purchase agreement with Ormat Technologies for up to 30 MW from Ormat's proposed geothermal project development in northern Nevada.
The world’s largest wind farm, located south of Abilene, Texas (population 115,000) already enjoyed access to sufficient transmission infrastructure necessary to bring the generation to a nearby market. But for much future renewable energy development new transmission will be needed since renewable energy resources tend to be remote from load centers.
Several states, including Texas, California, Minnesota and Colorado are using a "zone" approach to transmission planning in order to incorporate renewable energy. Driven by renewable portfolio standards in many states, the zone approach requires utilities to identify areas of renewable resources, plan the transmission capacity needed to reach those areas, and lobby state regulators to allow recovery of the investment in the required transmission. Some believe that a federal initiative of this ilk would be necessary in order to tap the nation's vast renewable resources across the country.