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This is a sub-issue of RASC-2019-2 Capacity Accreditation.
High levels of renewables result in a declining peak contribution and can create system instability. As MISO has studied high levels of renewable penetration on the grid within its RIIA study, it has recognized that its capacity accreditation framework – the manner by which it assesses variable renewables’ ability to contribute to peak demand needs – will likely change as these resources become more prevalent on the grid. However, MISO has not yet developed sufficiently robust forward guidance for resource planning processes to account for how those values might change in the future, creating uncertainty in the resource planning process.
MISO’s current resource adequacy requirements do not consider the expected marginal decline in load carrying capability from renewables as penetration increases, which we believe could ultimately result in a resource deficiency.
(Issue number formerly IR095)