The Cost of Energy
Energy use can carry a hefty price tag—and not just in money. The cost to our environment, to national security, and to the prospect of future sustainability is sometimes hard to calculate in dollar terms, but nonetheless very real in practical terms. What factors should we consider as we make decisions about energy options for the future?
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The Promise of Better LightingEnergy savings through lighting technology
Our Energy SystemA visualization of all our energy sources
- Kilowatt Hour (kWh)
A unit of measure for energy, typically applied to electricity usage. It is equal to the amount of energy used at a rate of 1000 watts over the course of one hour. One kWh is roughly equal to 3,412 British Thermal Units (Btu).
Search the National Academies Press website by selecting one of these related terms.
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