Before the 1980s, the only widely used renewable electricity technology was hydropower. Hydropower is still the most significant source of renewable energy, producing 20 percent of the world's electricity and 10 percent of that of the United States. The 1973 oil crisis awoke the country to its vulnerability through dependence on foreign oil. Subsequent changes in federal policy spurred the development of renewable technologies other than hydro. In 1978, Congress passed the Public Utility Regulatory Policies Act (PURPA), which …showed first 75 words of 637 total…

…showed last 75 words of 637 total…take care to find out what is expected or needed. References: Graham, Daniel A., "Cost-Benefit Analysis under Uncertainty," American Economic Review (September 1981, No.71, 715-725). Hazilla, Michael and Kopp, Raymond J., "Social Cost of Environmental Quality Regulations: A General Equilibrium Analysis." Journal of Political Economy (August 1990, No. 98, 853-73). Tator CH, Duncan EG, Edmonds VE, Lapczak LI, Andrews DF. Complications and costs of management. (1993); 31(11):700-14. Gramlich, Edward M., A Guide to Benefit-Cost Analysis (Englewood Cliffs: Prentice Hall, (1990).