Buyer Playbook
MISO • MidwestApr 24, 2026

MISO Capacity Cost Mitigation Guide: What To Do Before April 28

The Bottom Line (MISO / Midwest)

MISO's 2026/27 Planning Resource Auction results are scheduled for April 28, 2026, with the new planning year beginning June 1. Pre-auction data pointed to 135.6 GW of accredited capacity against a 137.5 GW requirement. Commercial buyers should not wait for the clearing price headline: review capacity pass-through language, confirm whether demand response is available, and model summer peak-load control before suppliers reprice Midwest fixed offers.

Apr 28
PRA Results
2026/27 auction posting
1.9 GW
Pre-Auction Gap
Accredited vs requirement
Jun 1
Planning Year
Capacity obligations begin

The Four Actions That Matter Now

Mitigation LeverTimingWhy It Matters
Capacity pass-through auditBefore Apr 28Identifies whether supplier can reprice capacity after results
Demand response enrollmentBefore summer seasonTurns curtailment capability into offsetting revenue
Peak-load controlJune-AugustReduces future capacity tag and coincident peak exposure
Fixed-rate extension reviewBefore results publishMay lock capacity assumptions before auction repricing

1. Audit Capacity Pass-Through Language

Many Midwest supply contracts quote a fixed energy price but reserve the right to pass through capacity, transmission, or resource adequacy charges. Before April 28, pull the executed agreement and look for terms such as capacity adjustment, planning resource auction, resource adequacy, regulatory change, or market pass-through.

If the supplier can pass through the final PRA result, the quoted fixed rate is not actually fixed. Ask for a bill-impact scenario at several clearing price levels and require the supplier to identify the specific line item that would change.

2. Treat Demand Response as a Hedge

MISO's demand resource rules for the 2026/27 planning year emphasize documentation, real-power testing, and the ability to curtail for defined events. That makes participation more operationally serious, but also more valuable if capacity prices rise. A cold-storage warehouse, wastewater plant, manufacturing line, or campus chiller plant with dispatchable load can use DR revenue to offset a portion of capacity inflation.

3. Reduce Future Peak Tags

Capacity cost is not just the auction clearing price; it is the clearing price multiplied by the customer's obligation or peak tag. Facilities that can pre-cool, sequence equipment, temporarily shift batch production, or use batteries during likely system peaks can reduce future capacity exposure even when the market price is high.

4. Decide Whether To Lock Before Results

The final pre-result window is narrow. If a supplier is still offering a fixed product with embedded capacity assumptions, compare that price against a transparent index-plus-capacity product. The fixed product may look higher today but become cheap if the April 28 result surprises upward.

States With Highest Buyer Exposure

  • Illinois: Large C&I accounts face both MISO and PJM adjacency risk depending on utility territory and supplier structure.
  • Indiana and Michigan: Coal retirement concentration and industrial load shape make peak management especially valuable.
  • MISO South: Mississippi, Louisiana, and Arkansas buyers should watch local resource adequacy and data-center-driven load additions.

Sources: MISO Resource Adequacy FAQ; MISO Planning Resource Auction timeline; MISO Demand Resource Registration and Testing Requirements for Planning Year 2026/2027; KilowattLogic MISO PRA pre-auction analysis.

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Model MISO Capacity Exposure

Capacity results can change a Midwest commercial invoice even when energy prices look stable.