ERCOT Real-Time Co-Optimization (RTCB) goes live Dec. 5, 2025

ERCOT has announced that Real-Time Co-Optimization (RTCB) will go live on Dec. 5, 2025, introducing major front-office and market model changes.

• Major system changes: RTCB restructures COP status handling (retiring legacy statuses such as ONREG, ONDSR, ONOSREG, ONDSRREG, ONRR, OFFNS, FRRSUP, FRRSDN, ONFFRRRS, ONECRS), updates RT Three-Part Offer requirements (Reason Code = “OTHR”, Reason Text required), implements real-time AS awards & AS prices via SCED, and migrates batteries to a Single-Model ESR (one unified device, single monotonic EB/OC curve, up to 10 price/quantity pairs).
• Operational details & reporting: New daily reports and timings include the AS Trade Overage Report (posted at 14:30) and two AS obligation reports (AS Obligation Advisory posted by 06:00, AS Obligation Final issued after DAM); price caps are enforced across energy and AS submissions ($5,000/MWh Day-Ahead SWCAP, $2,000/MWh Real-Time SWCAP), and legacy workflows (SASMs, FRRS Up/Down, Non-Spin $75/MWh TPO floor, RT energy bids for CLR-side batteries) are being retired.