Energy-Efficiency and Conservation: Programs that reduce energy use, both during peak and off-peak periods, typically without affecting the quality of services provided. Such programs substitute technologically more advanced equipment to produce the same (or a higher) level of end-use services (e.g., lighting, heating, cooling, drive power, or building shell) with less electricity.
Demand Response: Demand response is reducing or shifting electricity use in response to either high wholesale electricity prices or reliability problems on the electricity grid.
Distributed Generation (DG): Distributed generation refers to a variety of small, modular power-generating technologies that can be combined with energy management and storage systems and used to improve the operation of the electricity delivery system, whether or not those technologies are connected to an electricity grid.
Renewable Energy: Renewable energy resources include solar, wind, hydropower, hydrogen, geothermal, and biomass. Renewable energy resources - such as wind and solar energy - are constantly replenished and will never run out. Most renewable energy comes either directly or indirectly from the sun. Sunlight, or solar energy, can be used directly for heating and lighting homes and other buildings, for generating electricity, and for hot water heating, solar cooling, and a variety of commercial and industrial uses.