The maximum amount of powerThe rate of transfer of energy. It's essentially how quickly... an energy source can physically produce (measured in megawatts/MW), or when referring to an electrical gridThe electrical grid is a vast, interconnected network compri..., the total amount of electricity that power plants connected to the grid are capable of producing. It’s essentially the total potential output of all the electricity sources, like coal, nuclear, hydro, wind, and solar plants. Meanwhile, energy is the actual output of a source over a particular time period.
- Capacity accreditation – The process by which grid operators determine the reliabilityA characteristic of the whole electricity system to describe... contribution of individual power resources (such as power plants or energy storage systems) to the overall electricity grid. It quantifies how much a resource can reliably contribute to meeting demand, especially during peak times or periods of tight supply, guiding investment decisions for grid stability.
- Capacity auction – A competitive market mechanism where grid operators or utilities purchase energy in the market from electricity generators (such as coal plants, wind, and solar farms) or demand-response participants for future energy needs. Essentially, the generators or demand-response entities provide their energy or technology for future periods of high demand. Capacity market auctions ensure enough electricity is available for future demand at the lowest achievable price for consumers. The goal is to balance reliability with cost by having market participants compete. There are two main types of auctions:
- Forward capacity auctions: held years before the capacity is needed, giving operators time to upgrade or build facilities.
- Incremental auctions: take place closer to the delivery time, adjusting for changes in demand or unexpected generator issues.
Generally, participants submit sealed bids to offer capacity at specific prices. The auction ends when the total capacity offered matches the region’s needs, and a single clearing price is set for all commitments.
- Capacity costs – The charges associated with ensuring a sufficient supply of power to meet peak demandThe brief periods when electricity consumption is at its hig.... These charges cover the cost of maintaining and operating power plants, transmissionThe process (and infrastructure) of moving large amounts of ... infrastructure, and other components needed to meet the highest levels of electricity usage, essentially guaranteeing power is available when it’s most needed.
- Capacity market – A type of wholesale market designed to ensure there will be enough power generationThe process of creating electricity. available in the future to meet peak demand and maintain grid reliability. Generators receive payments for promising to be available to produce electricity when needed, even if they aren’t running all the time. Functions sort of like an insurance policy, in that generators are paid for the promise to show up with power during times of high demand. This type of market is a method to maintain resource adequacyAn assessment of whether the current or projected resource m.... Not all markets use this method (example: Electric Reliability Council of Texas (ERCOTThe Electric Reliability Council of Texas serves as an indep...).
