FERC Order 764 (2012) — Integration of Variable Energy Resources

Order No. 764, issued in June 2012 in Docket RM10-11-000, required transmission providers to revise their tariffs to facilitate better integration of variable energy resources, particularly wind and solar generation. As renewable penetration grew, FERC found that hourly scheduling intervals—legacy from an era dominated by dispatchable fossil generation—created unnecessary imbalances and costs when generator output fluctuated within the hour.

The order mandated adoption of 15-minute scheduling intervals to replace the outdated hourly scheduling system, aligning market scheduling with operational practices many balancing authorities already used internally. Generators and scheduling entities can submit revised schedules every 15 minutes, allowing operators to better balance supply and demand as renewable output changes with wind and cloud conditions. This reduces the magnitude of imbalance charges variable resources face and improves system reliability.

Order 764 also required transmission providers to offer intra-hourly scheduling for generators and enhanced the ability of system operators to manage transmission constraints caused by variable generation. The order addressed coordination between transmission providers and balancing authorities, generator imbalance service charges, and the information needed to forecast variable output. These changes were essential to reliably and efficiently operating a grid with rapidly increasing amounts of renewable energy.

Orders 764-A and 764-B provided rehearing clarifications on implementation timelines and tariff language. Order 764 does not require utilities to build new transmission but instead reforms scheduling practices that affect how variable resources participate in wholesale markets. It complements interconnection reforms in Orders 845 and 2023 by addressing operational integration after generators connect to the grid.

Order 764 required revisions to generator imbalance service tariffs so that penalties reflected shorter scheduling intervals rather than punishing resources for normal forecast error at sub-hourly timescales. Transmission providers had to coordinate with balancing authorities on schedule submission deadlines and data exchange needed for security-constrained economic dispatch. The reforms applied across the country regardless of RTO membership, making scheduling practice changes as important as new transmission construction for renewable integration. Industry compliance proceeded through tariff filings reviewed in the 764-A and 764-B rehearing proceedings.

By aligning scheduling intervals with operational reality, Order 764 reduced the friction between renewable developers and system operators that had produced excessive imbalance charges and curtailment disputes. The order is frequently cited alongside state renewable integration efforts as a federal market design prerequisite for high wind and solar penetration. Transmission providers across RTO and non-RTO regions implemented the scheduling reforms on timelines established in the order and rehearing clarifications.