(A - E) (F - J) (K - O) (P - T) (U - Z)

  • U.S. Department of Energy (DOE) : The DOE managers programs of research, development and commercialization for various energy technologies, and associated environmental, regulatory and defense programs. DOE announces energy policies and acts as a principal advisor to the President on energy matters.
  • U.S. Environmental Protection Agency (EPA) : The EPA administers federal environmental policies, enforces environmental laws and regulations, performs research, and provides information on environmental subjects. The agency also acts as chief advisor to the President on U.S. environmental policy and issues.
  • Ultrahigh Voltage Transmission : Transporting electricity over bulk-power lines at voltage greater than 800 kilovolts.
  • Unbundling : Disaggregating electric utility service into its basic components and offering each component separately for sale with separate rates for each component. For example, generation, transmission and distribution could be unbundled and offered as discrete services.
  • Uncertainties : Uncertainties are factors over which the utility has little or no foreknowledge, and include load growth, fuel prices, or regulatory changes. Uncertainties are modeled in a probabilistic manner. However, in the Detailed Workbook, you may find it is more convenient to treat uncertainties as "unknown but bounded" variables without assuming a probabilistic structure. A specified uncertainty is a specific value taken on by an uncertainty factor (e.g. 3 percent per year for load growth). A future uncertainty is a combination of specified uncertainties (e.g. 3 percent per year load growth, 1 percent per year real coal and oil price escalation, and 2.5 percent increase in housing starts).
  • Unit Energy Consumption (UEC) : The annual amount of energy that is used by the electrical device or appliance.
  • Universal Service : Electric service sufficient for basic needs (an evolving bundle of basic services) available to virtually all members of the population regardless of income.
  • Unserved or Unmet Energy : The average energy that will be demanded but not served during a specified period due to inadequate available generating capacity.
  • Upgrade : Replacement or addition of electrical equipment resulting in increased generation or transmission capability.
  • Uprate : An increase in the rating or stated measure of generation or transfer capability.
  • Utility : A regulated entity which exhibits the characteristics of a natural monopoly. For the purposes of electric industry restructuring "utility" refers to the regulated, vertically-integrated electric company. "Transmission utility" refers to the regulated owner/operator of the transmission system only. "Distribution utility" refers to the regulated owner/operator of the distribution system which serves retail customers.
  • Utility-Earned Incentives : Costs paid to a utility for achieving consumer participation in DSM programs.
  • Utilization Factor : The ratio of the maximum demand of a system or part of a system to the rated capacity of the system or part of the system.

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