ISO-NE proposes capacity market overhaul with shift to ‘prompt’ auction

Core Viewpoint - ISO New England (ISO-NE) is proposing to reform its capacity auction process by shifting to a "prompt" capacity auction framework, allowing capacity to be procured a month in advance instead of three years, aiming for improved accuracy in load forecasts and auction parameters [2][3]. Group 1: Proposal Details - The proposed changes are set to take effect in June 2028 and will only allow existing resources to participate in the capacity auction [2]. - The new framework is expected to enhance the efficiency of auction outcomes and better meet resource adequacy objectives, addressing uncertainties regarding future resource needs in New England [3][5]. Group 2: Market Dynamics - ISO-NE anticipates a decline in its reserve margin from 15% in 2029 to 8% in 2034, influenced by home and vehicle electrification, although this forecast may be overly optimistic due to the end of federal tax credits for electric vehicles [4]. - The proposal includes a change in the process for power plant retirements, moving from a four-year advance notice to a one-year notification requirement, allowing for more accurate decision-making based on current market conditions [5][6]. Group 3: Stakeholder Engagement - The proposal has garnered broad support from stakeholders and is part of a larger initiative to reform the capacity market [6]. - ISO-NE is also collaborating with stakeholders to develop a seasonal capacity auction framework, replacing the current annual model to better reflect summer peak demand [7].