Capacity Market Design and Electricity System Reliability
Summary
Capacity markets are structured mechanisms that remunerate power generators, storage operators and demand-side resources for maintaining available capacity over a defined period, thereby ensuring that sufficient resources exist to meet peak demand and unexpected system stress. In liberalised electricity systems, the intermittent nature of renewable generation, combined with evolving demand patterns and network constraints, has heightened concerns over adequacy and security of supply. Capacity market design therefore addresses the twin objectives of signalling efficient long-term investment and preserving system reliability in the face of growing variability. Key design elements include product definition (duration and timing of capacity obligations), procurement procedures (auctions or bilateral contracts), qualification criteria (performance requirements, penalties for non-delivery) and technology neutrality. Practical implementations vary widely—from forward capacity auctions with multi-year contracts to strategic reserves activated only under scarcity conditions. Effective designs balance the need for investment incentives, cost containment and integration of emerging resources such as energy storage and demand response. International experience highlights the importance of transparent price signals and close coordination with energy, ancillary services and carbon markets to deliver a resilient and decarbonised power system.
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Capacity Market Design and Electricity System Reliability publication trend
The graph below shows the total number of articles in capacity market design and electricity system reliability across all publications each year (not limited to Nature Index journals).
Technical terms
Capacity market: A mechanism that pays resources for being available to supply or curtail power during periods of system stress, thereby ensuring resource adequacy.
Capacity remuneration mechanism (CRM): A structured framework, often auction-based, which secures commitments from generators or other resources to provide capacity at specified future times.
Strategic reserve: A quantity of capacity held aside from the energy market and only activated when system margins fall below predefined thresholds.
Capacity credit: A metric that quantifies the reliable contribution of a resource (e.g. wind, solar or storage) towards meeting peak demand.
Reserve margin: The excess capacity above peak expected demand, expressed as a percentage, used to absorb contingencies and forecast errors.
References
- A survey on electricity market design: Insights from theory and real-world implementations of capacity remuneration mechanisms. Energy Economics (2019).
- An analysis of a forward capacity market with long-term contracts. Energy Policy (2017).
- On the role of electricity storage in capacity remuneration mechanisms. Energy Policy (2021).
- Combining capacity mechanisms and renewable energy support: A review of the international experience. Renewable and Sustainable Energy Reviews (2022).
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