MISO Data Exchange Load, Generation, and Interchange API
The system-data half of MISO Data Exchange. Twenty-two documented GET operations spanning actual load, day-ahead and real-time cleared demand, day-ahead cleared generation both physical and virtual, day-ahead and real-time generation by fuel type, offered and committed generation at ECOMAX and ECOMIN, fuel-on-the-margin, day-ahead, real-time and historical net scheduled interchange, real-time net actual interchange, real-time binding constraints, real-time and forecast outages, the medium-term load forecast, and state estimator load. MISO's own operation metadata carries the warning that interchange data is subject to change up to one hundred and five days after the market day due to reconciliation. Every operation is date-pathed (/v1/{market}/{yyyy-mm-dd}/...) with optional interval, region and paging filters. A subscription key is required — an anonymous GET to https://apim.misoenergy.org/lgi/v1/real-time/2026-07-26/demand/actual returned HTTP 401 "Access denied due to missing subscription key" on 2026-07-27 — and that key is self-serve with no approval step. The OpenAPI in openapi/ was assembled verbatim from MISO's anonymously served portal metadata.