"Increasing temperatures, decreasing water availability, more intense storm events, and sea level rise will each independently, and in some cases in combination, affect the ability of the United States to produce and transmit electricity from fossil, nuclear, and existing and emerging renewable energy sources," the report said. (See related story: "Obama Unveils Climate Change Strategy.")

It catalogued a long list of impacts already occurring: the fuel shortages in New York and New Jersey after Hurricane Sandy, the shutdowns of power plants in New England and Illinois last summer due to hot weather and drought, the restrictions placed on fracking companies' access to water in North Dakota and elsewhere.

Such disruptions are likely to become "more frequent and intense" in the years