Resource adequacy ensures there is enough available power to meet peak demand at all times. It is a key function of MISO. MISO serves as an intermediary between energy sellers and buyers in its region through the Planning Resource Auction. MISO’s resource adequacy construct complements the jurisdiction that regulatory authorities have in determining the necessary level of adequacy. It also works in concert utilities that provide demand forecasts that help drive the development of local and regional requirements. MISO began determining resource adequacy on a seasonal, rather than annual, basis in Fall 2022.
See BPM-011 Resource Adequacy for more information on resource adequacy and processes.
The annual Planning Resource Auction (PRA) demonstrates sufficient resources and allows market participants to sell capacity, via an auction, to other market participants who may expect a shortfall. MISO sets the capacity requirements in its region for each season of the June 1 to May 31 time period. MISO bases the region’s energy needs, including a planning reserve margin, on multiple studies including members’ demand forecasts for peak use. It determines the reserve margin from the annual Loss-of-Load Expectation study. MISO accepts auction offers the last four business days of March, applies constraints calculators, and then approves or rejects the transactions within the first 20 business days of April.
MISO conducts and issues resource assessments in advance of each season that evaluate potential resource adequacy risks for the upcoming season. These informational assessments evaluate projected near-term available capacity under probably and extreme peak load forecasts and historical generator outage conditions for each season.
The assessments highlight potential issues in the upcoming seasons to help system operators and stakeholders prepare for potential strained system conditions and develop preventative actions.
RA Seasonal Accredited Capacity FAQ (KA-01373)
MECT Seasonal Accredited Capacity Displays (KA-01320)
MECT Tool Changes for Seasonal Accredited Capacity (Video)
SAC Resolution Process (KA-01376)
SAC Templates & Information
How to Use the Resource Adequacy SAC Unit Template (KA-01372)
How to Use the Resource Adequacy SAC Unit Template (Video)
How to access Schedule 53 SAC Validation files in the Market Portal
Computer Based Training
The following module is available in the Customer Learning Center:
Introduction to Seasonal Accredited Capacity
Auction cycle will move from annual to seasonal auction (clearing all four seasons still once yearly).
Seasonal Accredited Capacity (SAC)
The thermal resource accreditation will be calculated seasonally based on each resource’s real-time offered availability during all hours and hours with the tightest operating conditions to effectively reflect the actual availability of resources during times when they are most needed. The calculation of SAC values will be enhanced to a more efficient, automated process in replacement of the current manual method for thermal type resources.
The general process for auctions will not change.
Data required for each auction cycle will not change.
Development is currently underway. Enhancements are being released to MECT Customer Connectivity Environment (CCE) as they become available. Production release and implementation will coincide with the 2023-2024 Plan Year cycle to begin in September 2022.
|Date||Current & Upcoming
|Data View Provided|
|Now Available in PRA Docs > PY23-24||RA Hours||Sept 2019 - Aug 2022 (PY 23/24)|
|November 2022||Initial Class Average
Initial UCAP/ISAC Ratio
(Draft) SAC Values
|Sept 2019 - Aug 2022 (PY 23/24)|
|December 15, 2022||Final SAC Values||Sept 2019 - Aug 2022 (PY 23/24)|
PY = Plan Year
Recently published references:
|How to Access Customer Connectivity Environment (CCE) KA-01319|
Registrations in MECT
Registrations in MECT (Video Walkthrough) KA-01369
Seasonal Accredited Capacity Displays Doc KA-01320
Seasonal Accredited Capacity Displays (Video Walkthrough) KA-01368
Net Capacity Verification Test KA-01344
Seasonal Accredited Capacity:
Resource Adequacy/Seasonal Accredited Capacity FAQ KA-01373
How to Access Customer Connectivity Environment (CCE) KA-01319
LMS Training: Intro to Seasonal Accredited Capacity
MECT Tool Changes for Seasonal Accredited Capacity KA-01368
MECT - Registration Changes with SAC KA-01369