ERCOT | PJM | CAISO | MISO — ISO/RTO Wholesale LMP Data
Historical LMP price charts for ERCOT, PJM, CAISO, and MISO are being integrated via the EIA Wholesale Electricity Market API. ISO reference data and market design information are available below.
Electric Reliability Council of Texas
PJM Interconnection
California ISO
Midcontinent ISO
Primary ERCOT liquid hub. Represents load-zone pricing for the greater Houston area. Highest liquidity for financial trades and PPAs in the Texas market. Summer prices can spike to the $5,000/MWh ERCOT offer cap during scarcity events.
Most traded hub in PJM. Aggregation of nodes in western Pennsylvania. Benchmark for PJM bilateral and financial trades. Capacity payments from RPM auctions provide a revenue floor that dampens wholesale price volatility.
Default pricing zone for Southern California load. Subject to pronounced "duck curve" dynamics: midday prices can go negative during high solar output, while evening ramp prices spike as solar drops off and gas plants ramp.
Primary MISO trading hub located at the center of the footprint. Reflects Midwest generation economics with substantial wind penetration. Lower basis risk than peripheral nodes; commonly used for MISO financial hedging.
Energy-only market (no capacity payments)
Texas (TX)
Capacity + energy market (RPM capacity auctions)
Mid-Atlantic / Midwest (PA, NJ, DE, MD, VA, WV, OH, IN, IL, MI, KY, NC, TN, DC)
Energy + RA (resource adequacy requirements)
California / West (CA)
Capacity + energy market (PRA capacity auctions)
Central US (MN, WI, IA, IN, MI, IL, MO, AR, LA, MS, MT, ND, SD)
Historical wholesale LMP data sourced from the EIA Open Data API (Wholesale Electricity Market endpoint). Integration in progress.