FERC Order 2003 (2003) — Standardization of Generator Interconnection Agreements and Procedures

Order No. 2003, issued in July 2003 in Docket RM02-1-000, standardized the interconnection procedures and agreements for large generators—generally facilities greater than 20 MW—seeking to connect to the interstate transmission grid. Before Order 2003, each transmission provider used its own interconnection agreements and study processes, creating uncertainty for developers and barriers to entry for new generation investment.

FERC established the Large Generator Interconnection Procedures (LGIP) and Large Generator Interconnection Agreement (LGIA) as pro forma documents that all transmission providers must use. The LGIP defines the study sequence—feasibility, system impact, and facilities studies—along with timelines, cost responsibility rules, and queue management procedures. The LGIA is the binding contract governing construction of interconnection facilities, network upgrades, commercial operation milestones, and operating obligations once a project synchronizes to the grid.

The order distinguished Energy Resource Interconnection Service (ERIS), which allows injection at the point of interconnection subject to curtailment, from Network Resource Interconnection Service (NRIS), which treats the generator as a network resource for delivery to load. Developers choose the service level based on how they intend to sell output. Order 2003 set clear milestones for site control, financial deposits, and commercial operation, giving banks and investors greater certainty when financing large generation projects.

The order implemented a serial, first-come, first-served queue in which each interconnection customer bore the cost of network upgrades its project triggered. While this model provided transparency, it later proved inefficient as renewable energy surged and queues ballooned—leading to Order 2023's cluster reforms. Orders 2003-A and 2003-B addressed rehearing requests and refined study and cost provisions. Order 2003 remains the foundational interconnection framework that later orders including 845 and 2023 amended.

The LGIP established study deposit requirements, dispute resolution procedures, and rules for affected systems whose facilities may require reinforcement when new generation connects nearby. Interconnection customers must demonstrate site control and pay for interconnection facilities from the point of change of ownership to the point of interconnection, while network upgrades addressing broader system needs are allocated under defined cost responsibility rules. Order 2003 harmonized definitions across regions so developers could finance projects with predictable milestones—feasibility, system impact, and facilities studies—each with Commission-approved timelines. The standardization effort responded to explosive growth in independent power development and remains the structural backbone of U.S. generator interconnection regulation.

By replacing utility-specific agreements with mandatory pro forma documents, Order 2003 gave FERC direct oversight of interconnection terms that previously varied widely across regions. The order's serial queue model would later draw criticism as renewable queues exploded, but its standardization of definitions, study rights, and contractual milestones remains essential to every subsequent interconnection reform.