Central United States; Manitoba, Canada interface.
Wholesale design: nodal energy and operating-reserve market with an annual seasonal Planning Resource Auction.
Energy in MISO trades in 2 layers: Day-Ahead Energy and Operating Reserve Market and Real-Time Energy and Operating Reserve Market. Participation in Real-Time Energy and Operating Reserve Market is mandatory. Scheduling and settlement, where the cited sources give them, are in the table below.
| Layer | Scheduling | Settlement |
|---|---|---|
| Day-Ahead Energy and Operating Reserve Market | hourly | locational marginal pricing for energy and zonal market-clearing prices for operating reserves |
| Real-Time Energy and Operating Reserve Market (mandatory) | five-minute | real-time locational marginal pricing for energy and market-clearing prices for operating reserves |
MISO has 6 ancillary-service products, across 4 families — regulation, contingency reserve, ramping reserve and replacement reserve: Ramp Capability Down, Ramp Capability Up, Regulating Reserve, Spinning Reserve, Short-Term Reserve, Supplemental Reserve. Response timing, direction and eligibility for each are in the table below; a product's full record lists the official sources behind it.
Every value below comes from the official sources listed in that product's full record. Most products cite more than one, and the published sources do not say which of them states each individual value, so the binding is to the product's record rather than to a single document. A missing line means the source does not state that value — never that the value is zero.
Scroll the table sideways for the rest of the columns →
| Service | How it activates | Response | Sustained delivery | Procurement |
|---|---|---|---|---|
| Regulation | ||||
| Regulating Reserve Regulation | Response type pre-contingency continuous Trigger continuous movement within the cleared regulation range Dispatched by automatic generation control | Stated response MISO characterizes regulation as covering the approximately four-second to five-minute operating horizon; that horizon is not a promise that every award reaches full output in four seconds. | Through day-ahead; real-time Pricing design capacity and performance/mileage compensation under MISO tariff rules | |
Full record for Regulating Reserve — document bound, page for these figures not recorded What it is for Correct short-duration frequency and area-control error deviations through automatic control. What the source does not state The source states a response time in its own words. It does not state how long delivery has to be sustained, and the volume is either set per auction or not published as a standing figure — the source does not say which. Sources | ||||
| Contingency reserve | ||||
| Spinning Reserve | Response type post-contingency Trigger online synchronized capability available within ten minutes Dispatched by MISO contingency-reserve deployment instruction | Expected within 10 min | Through day-ahead; real-time Pricing design operating-reserve market-clearing price | |
Full record for Spinning Reserve — document bound, page for these figures not recorded What it is for Provide synchronized contingency reserve after a supply or transmission contingency. Checkpoint recap Expected within 10 min What the source does not state The source states the response deadline. It does not state how long delivery has to be sustained, and the volume is either set per auction or not published as a standing figure — the source does not say which. Sources | ||||
| Short-Term Reserve STR | Response type post-contingency and flexibility Trigger online or qualified offline capability in the approximately thirty-minute to three-hour operational horizon Dispatched by market commitment or MISO instruction | Expected within 30 min | Through day-ahead; real-time Pricing design operating-reserve market-clearing price | |
Full record for Short-Term Reserve — document bound, page for these figures not recorded What it is for Provide thirty-minute flexibility to manage short-term uncertainty and events outside ten-minute contingency-reserve coverage. Checkpoint recap Expected within 30 min What the source does not state The source states the response deadline. It does not state how long delivery has to be sustained, and the volume is either set per auction or not published as a standing figure — the source does not say which. Sources | ||||
| Ramping reserve | ||||
| Ramp Capability Down | Response type pre-contingency flexibility Trigger forward ramp need over approximately ten to thirty minutes Dispatched by co-optimized dispatch positioning | Stated response The product addresses the ten-to-thirty-minute operating horizon; requirements and available capability vary by interval. | Through day-ahead; real-time Pricing design market-clearing price reflecting opportunity cost and scarcity under tariff rules | |
Full record for Ramp Capability Down — document bound, page for these figures not recorded What it is for Maintain downward ramp capability for anticipated net-load changes and forecast error beyond the immediate dispatch interval. What the source does not state The source states a response time in its own words. It does not state how long delivery has to be sustained, and the volume is either set per auction or not published as a standing figure — the source does not say which. Sources | ||||
| Ramp Capability Up | Response type pre-contingency flexibility Trigger forward ramp need over approximately ten to thirty minutes Dispatched by co-optimized dispatch positioning | Stated response The product addresses the ten-to-thirty-minute operating horizon; requirements and available capability vary by interval. | Through day-ahead; real-time Pricing design market-clearing price reflecting opportunity cost and scarcity under tariff rules | |
Full record for Ramp Capability Up — document bound, page for these figures not recorded What it is for Maintain upward ramp capability for anticipated net-load changes and forecast error beyond the immediate dispatch interval. What the source does not state The source states a response time in its own words. It does not state how long delivery has to be sustained, and the volume is either set per auction or not published as a standing figure — the source does not say which. Sources | ||||
| Replacement reserve | ||||
| Supplemental Reserve | Response type post-contingency Trigger qualified capability available within ten minutes Dispatched by MISO contingency-reserve deployment instruction | Expected within 10 min | Through day-ahead; real-time Pricing design operating-reserve market-clearing price | |
Full record for Supplemental Reserve — document bound, page for these figures not recorded What it is for Provide additional contingency reserve from qualified online or offline resources. Checkpoint recap Expected within 10 min What the source does not state The source states the response deadline. It does not state how long delivery has to be sustained, and the volume is either set per auction or not published as a standing figure — the source does not say which. Sources | ||||
Yes — Planning Resource Auction is a central capacity market.
The PRA is a residual mechanism after bilateral and self-supply positions; it does not represent all capacity in the MISO footprint.
Current as of · from the Global Electricity Market Catalogue v1.2.0 (compiled to , CC BY 4.0, rendered here with wording edited for readability). Facts belong to the linked official authorities; verify the current rules before design or bidding decisions.
The markets index holds the full set. For what the grid demands of a battery here, see the grid-code ride-through atlas.