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MISO IMM API

The IMM API from MISO — 1 operation(s) for imm.

MISO IMM API is one of 38 APIs that MISO publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include IMM. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

This API exposes 1 operation across 1 path, and defines 38 schemas. It is described by OpenAPI 3.2.0, at version 3.3.0.

Requests are made against 2 base URLs: https://cce.midwestiso.org/dart2/, https://markets.midwestiso.org/dart2/.

1 operations 1 paths 38 schemas 1 GET

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
3.3.0
Base URL
https://public-api.misoenergy.org
License
For use by MISO member companies and thier vendors
Resource Areas
1

Paths & Operations 1

Across 1 path, the API surfaces 1 operation — 1 GET. Each is listed below with its method, path, parameters, and response codes.

IMM 1
GET
/markets/{market}/{day}/imm/resource-assignment/participants/{participantName}
Get participant imm offer
getParticipantImmOffer 6 params → 200400403404500

Schemas 38

The contract defines 38 schemas that model the data the API accepts and returns. The most detailed are ESRImmResourceAssignmentItem (18 properties), GenImmResourceAssignmentItem (18 properties), DRR2ImmResourceAssignmentItem (18 properties), EARImmResourceAssignmentItem (16 properties). Each schema is shown below with its type and property counts.

MarketTypeIncBoth
string
Energy Market types, includes support for both markets.
ESRImmResourceAssignmentItem
object
18 properties 3 required
MarketPriceNullable
numbernull
General type for all market prices.
SERCommitStatusNullable
stringnull
ESRCommitStatusNullable
stringnull
MarketOperatingDay
string
Effective Market operating day of data. RFC 3339. 'YYYY-MM-DD'.
OpCostNullable
numbernull
Operational cost for resource such as startup, noload, or shutdown costs.
DIRImmResourceAssignmentItem
object
13 properties 3 required
EARCommitStatusNullable
stringnull
DRR1ImmResourceAssignmentItem
object
12 properties 3 required
EARImmResourceAssignmentItem
object
16 properties 3 required
MarketType
string
Energy Market types.
DownTimeNullable
stringnull
Type used to represent down time for the resource.
MWRampRateNullable
numbernull
Used to represent a ramp rate which is measured in MW/Min.
RealEnergy
number
Used to represent real energy values submitted to the market.
DRR2CommitStatusNullable
stringnull
HourLabel
integer
Hour ending label. Represents an hour segment of time.
PNodeName
string
Commercial Pricing Node (PNode) name.
GenCommitStatusNullable
stringnull
DurationNullable
stringnull
Type used to represent time duration.
APIResponse
object
General container for API response.
4 properties
MultiVariantImmResourceAssignment
object
IMM ResourceAssignment
2 properties 2 required
RunTimeNullable
stringnull
Type used to represent run time for the resource.
SERImmResourceAssignmentItem
object
9 properties 3 required
ParticipantName
string
Market participant name.
NotificationTimeNullable
stringnull
Type used to represent time required for Cold Notification/Intermediate Notification/Hot Notification for the resource.
RealEnergyNegativeNullable
numbernull
Used to represent real energy values submitted to the market that must be less than or equal to zero. Nullable added to allow for data driven delete behaviour.
IMMScheduleType
string
GenImmResourceAssignmentItem
object
18 properties 3 required
MaxRunTimeNullable
stringnull
Type used to represent run time for the resource.
StartupTimeNullable
stringnull
Type used to represent time required for Cold Startup/Intermediate Startup/Hot Startup for the resource.
DRR2ImmResourceAssignmentItem
object
18 properties 3 required
RealEnergyResultsSignedNullable
numbernull
Used to represent real energy values in market outcomes. Historically simliar to 'MWType'.
RealEnergySignedNullable
numbernull
Used to represent real energy values submitted to the market. Nullable added to allow for data driven delete behaviour.
MarketPrice
number
General type for all market prices.
DRR1CommitStatusNullable
stringnull
RealEnergyNullable
numbernull
Used to represent real energy values submitted to the market. Nullable added to allow for data driven delete behaviour.
TransitionTimeNullable
stringnull
Type used to represent time required for transitioning from Hot To Cold state/Hot to Intermediate state for the resource.

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

miso-imm-api-openapi.yml Raw ↑

Other APIs MISO publishes across the network.

MISO Market Reports
MISO File Download API
MISO FTR MPMA Market User API
MISO EDR Service (Electronic Data Reporting)
MISO CROW API (Outage Scheduling)
MISO Fuel and Consumables Data Request API
MISO Market Portal Meter Data and Settlement Statements API
MISO Ace API
MISO Admin API
MISO Aggregated Pnode API
MISO Bidding API
MISO Binding Constraints API
Where this information came from

This is an independent, third-party profile of MISO IMM API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

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