ENERGY LAW AND ACCREDITATION OF ENERGY STORAGE FACILITIES

1. Introduction

Accreditation of energy storage facilities refers to the legal and regulatory process through which a battery, pumped-storage plant, thermal-storage system, hydrogen-storage facility, or other electricity-storage resource becomes recognised as technically, legally, and commercially eligible to connect to the grid or participate in electricity markets.

There is no single universal accreditation system. Depending on the jurisdiction, approval may involve generation or storage licensing, planning permission, grid-connection approval, technical certification, fire and electrical safety compliance, environmental authorisation, metering certification, market registration, capacity accreditation, and qualification for ancillary-service markets.

Modern energy law increasingly treats storage as a distinct and flexible electricity resource rather than simply as conventional generation or consumption.

2. Regulatory Purpose of Accreditation

Accreditation protects the reliability and safety of electricity systems. Before participating in regulated markets, storage facilities may need to demonstrate compliance with requirements concerning rated capacity, duration, state-of-charge management, charging capability, discharge performance, frequency response, metering accuracy, cybersecurity, environmental standards, and emergency shutdown systems.

Market accreditation is particularly important because the amount of installed battery capacity is not necessarily equal to the capacity that can reliably be delivered during system stress. Regulators and system operators may therefore apply duration requirements, derating factors, availability testing and performance obligations.

In the United States, FERC Order No. 841 required regional transmission organisations and independent system operators to establish participation models recognising the operational characteristics of electric-storage resources. Storage resources must be permitted to provide capacity, energy and ancillary services for which they are technically capable.

3. Case Name/Citation

National Association of Regulatory Utility Commissioners v Federal Energy Regulatory Commission, 964 F.3d 1177 (D.C. Cir. 2020)

Facts

FERC adopted Orders 841 and 841-A to remove barriers preventing electric-storage resources from participating effectively in federally regulated wholesale electricity markets. State regulators and public power organisations challenged FERC's authority, particularly concerning storage resources connected to distribution systems.

Legal Issue

Whether FERC exceeded its jurisdiction under the Federal Power Act by requiring RTOs and ISOs to permit qualifying storage resources to participate in wholesale markets.

Judgment

The United States Court of Appeals for the D.C. Circuit rejected the challenge and upheld FERC's storage-market rules. The court concluded that petitioners had not demonstrated that Orders 841 and 841-A violated the Federal Power Act's division of federal and state jurisdiction or were arbitrary and capricious.

Legal Principle/Ratio

Federal regulators may establish rules governing the participation of storage facilities in wholesale electricity markets where those rules directly affect wholesale rates and market access, while states continue exercising authority over matters allocated to them under electricity legislation.

Significance

The case provides an important legal foundation for regulatory accreditation of storage resources. A storage facility meeting technical and market requirements cannot automatically be excluded merely because traditional market rules were designed around conventional generators.

4. Technical and Market Qualification

Accreditation should distinguish between physical certification and market qualification. Physical certification concerns equipment safety, grid-code compliance and interconnection capability. Market accreditation determines whether the facility satisfies requirements for capacity, balancing, frequency response or other services.

FERC's implementation of Order 841 required organised markets to recognise characteristics unique to storage and generally allow qualifying storage resources to provide services they are technically capable of supplying.

Consequently, accreditation methodologies should avoid imposing requirements designed exclusively for thermal generation where they unnecessarily disadvantage storage technologies.

5. Capacity Accreditation

Capacity accreditation measures the contribution a storage facility can reliably make to system adequacy. Relevant factors include MW output, MWh energy capacity, discharge duration, expected availability, charging constraints, forced-outage rates and coincidence with peak demand.

A four-hour battery, for example, may receive different accredited capacity from a longer-duration facility because the two resources provide different levels of reliability during prolonged scarcity events.

Legal disputes may arise where accreditation methodologies allegedly discriminate among technologies or materially affect wholesale market compensation. Such rules must ordinarily be justified through transparent regulatory procedures and supported by evidence.

6. Safety and Environmental Accreditation

Storage operators may additionally face rules governing battery fire risk, hazardous materials, recycling, land-use approval, environmental assessment and decommissioning. Grid operators may require protection systems, telemetry and operational testing before commercial operation.

Accreditation therefore operates as a continuing compliance obligation, rather than merely a one-time certificate.

7. Conclusion

Energy-storage accreditation provides the legal bridge between installation of storage technology and lawful participation in electricity systems. It combines licensing, technical certification, interconnection approval, safety regulation and market qualification. NARUC v FERC demonstrates that regulators may restructure market-access rules to accommodate the distinctive characteristics of storage technologies. Effective accreditation frameworks should therefore be technology-neutral, transparent and performance-based while preserving grid reliability, consumer protection and regulatory jurisdiction.