en.Wedoany.com Reported - The latest OMS-MISO survey released by the Midcontinent Independent System Operator (MISO) shows that the power supply margin within its jurisdiction will continue to grow, marking a reversal of the supply gap predicted two years ago. Under the condition of an average annual load growth of 5.1%, the survey still estimates that the available power supply margin will improve.

Survey data indicates that in the planning year starting June 2027, MISO's available supply across all seasons will exceed its planning reserve margin, with surpluses ranging from 4.6 MW to 12.7 MW. The report predicts that these surplus levels may further expand. Based on the November load forecast, MISO's excess capacity beyond the planning reserve margin requirement (including buffers for higher-than-expected peak loads) will increase from 11.5 GW in summer 2028 to 39 GW in summer three years later. However, these reserve margin figures are significantly smaller when based on the April load forecast.

Recently, solar and battery storage have constituted the main portion of new capacity additions. The report notes that of the approximately 100 GW of new supply expected by 2032, about 60% comes from wind, solar, and batteries, with the remaining 40% from gas-fired generation.

MISO noted that there is uncertainty regarding the feasibility of the 87 GW of resources that have signed generator interconnection agreements but have not yet been built. The grid operator stated that it is studying an additional 192 GW of interconnection requests. According to MISO's generator interconnection queue commercial operation date dashboard data, 3 GW of nameplate capacity has been commissioned so far this year, compared to 10.6 GW for the full year last year, 7.6 GW in 2024, and 5.6 GW in 2023. During this period, solar power accounted for nearly 60% of the total 26.8 GW of installed capacity.

MISO stated that it is transitioning to a "direct load loss" resource accreditation method, which will assess a resource's contribution to reliability during the highest-risk hours. This change will take effect in MISO's 2028/29 planning year.

MISO operates the grid and wholesale electricity markets in 15 U.S. states and the Canadian province of Manitoba. Carrigan stated that the OMS-MISO survey has become an important tool for states, utilities, MISO, and stakeholders to understand changes in resource adequacy within the grid operator's footprint, with this survey achieving a record participation rate of 99.5%.

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