IAEE Members and subscribers to The Energy Journal: Please log in to access the full text article or receive discounted pricing for this article.

Crediting Wind and Solar Renewables in Electricity Capacity Markets: The Effects of Alternative Definitions upon Market Efficiency

As the penetration of variable renewable energy in electricity markets grows, there is increasing need for capacity markets to account for the contribution of renew-ables to system adequacy. An important issue is the inconsistent industry definition of capacity credits for resources whose availability may be limited, such as renewable generation. Inaccurate credits can subsidize or penalize different resources, and consequently distort investment between renewables and non-renew-ables, and also among different types and locations of renewables. Using Electric Reliability Council of Texas (ERCOT) data, we use a market equilibrium model to quantify the resulting loss of efficiency due to capacity credits alone and in combination with renewable tax subsidies and portfolio standards. Layering inaccurate capacity credits with existing US federal tax subsidies decreases efficiency as much as 6.3% compared to optimal capacity crediting under those subsidies. Compensating producers based on their marginal contributions to system adequacy, considering how renewable penetration affects the timing of net load peaks, can yield an efficient capacity market design.

Download Executive Summary Purchase ( $25 )

Download Appendix 

JEL Codes: Q42: Alternative Energy Sources, Q20: Renewable Resources and Conservation: General, Q40: Energy: General, Q21: Renewable Resources and Conservation: Demand and Supply; Prices

Keywords: Electricity Markets, Capacity Mechanisms, Renewable Generation, Wind, Solar

DOI: 10.5547/01956574.38.SI1.cbot

References: Reference information is available for this article. Join IAEE, log in, or purchase the article to view reference data.

Published in Volume 38, KAPSARC Special Issue of the bi-monthly journal of the IAEE's Energy Economics Education Foundation.


© 2023 International Association for Energy Economics | Privacy Policy | Return Policy