U.S. Department of Energy Energy Efficiency & Renewable Energy U.S. Department of Energy Energy Efficiency & Renewable Energy


Use the glossary to access terms and definitions related to residential energy efficiency programs. Click the letters below to find your terms. Letters that do not appear currently do not have glossary terms related to them.

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Net Present Value (NPV)

The value of a stream of cash flows converted to a single sum in a specific year, usually the first year of the analysis. It can also be thought of as the equivalent worth of all cash flows relative to a base point called the present.

Non-energy Benefits

The identifiable benefits that accrue to energy efficiency programs beyond energy savings, such as job creation, economic development, avoided emissions, and water savings. Quantifying these non-energy benefits may help program administrators improve upon cost-effectiveness tests, demonstrate progress toward program or policy goals, and increase general awareness and support for program activities.