Appendix A: Glossary of renewable energy terms
The abbreviations in parentheses at the end of some definitions refer to the Sources listed below. Some definitions are slightly shortened or otherwise minimally edited for clarity.
Active solar: Energy from the sun collected and stored using mechanical pumps or fans to circulate heat-laden fluids or air between solar collectors and a building. (EIA)
Aggregator: Any marketer, broker, public agency, city, county or special district that combines the loads of multiple end-use customers in negotiating the purchase of electricity, the transmission of electricity and other related services for these customers. (EIA)
Ancillary services: Services that ensure reliability and support the transmission of electricity from generation sites to customer loads. Such services may include load regulation, spinning reserve, non-spinning reserve, replacement reserve and voltage support. (EIA)
Auction: A procurement mechanism by which renewable energy supply or capacity is competitively solicited from sellers, who offer bids at the lowest price that they would be willing to accept. (REN21)
Avoided cost: The incremental costs to an electric utility of electric energy or capacity or both which, but for the purchase from the qualifying facility or qualifying facilities, such utility would generate itself or purchase from another source.
Base load: The minimum level of demand on an electric grid over a given period of time (usually over the year, or over a season or day). Base load power sources are power stations that are capable of consistently generating the electrical power needed...
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