Ohio PUCO OAC 4901:1-10-28 Solar Net Metering Guide: Sizing, Credits, and SRECs

Key Takeaways

• Net metering facilities in Ohio are subject to a 120% sizing limit based on historical electricity requirements.
• This sizing limit is calculated using the average electricity supplied over the previous three years.
• Excess generation is converted to a monetary credit at the Standard Service Offer (SSO) energy component.
• Monetary credits for excess generation continuously carry forward on future bills.

What are Ohio's Net Metering Rules (OAC 4901:1-10-28)?

Ohio Administrative Code (OAC) Rule 4901:1-10-28 establishes the framework for net metering across Ohio's electric utilities, including AEP Ohio, Duke Energy Ohio, AES Ohio, and FirstEnergy. This rule, effective April 8, 2024, defines how customer-generators can connect solar facilities to the grid and receive credit for excess electricity. It addresses system sizing, credit mechanisms, and ownership of Renewable Energy Credits (SRECs).

The table below summarizes the primary provisions of OAC 4901:1-10-28.

| Interconnection Chapter Cross-Reference | Chapter 4901:1-22 of the Administrative Code. | Figures as of August 2026.

How We Verified Ohio's Net Metering Regulations

We verified the provisions of Ohio Administrative Code Rule 4901:1-10-28 by directly consulting the official online publication of the Ohio Administrative Code. The specific rule text, including its effective date of April 8, 2024, was accessed on August 23, 2026, from the Ohio government's codes website. This direct source ensures the accuracy of the statutory limitations and requirements presented in this guide.

Understanding the 120% Sizing Limit

Ohio's net metering rule mandates that a customer-generator's solar facility must not exceed one hundred twenty per cent of its electricity requirements at the time of interconnection. This requirement is calculated based on the average amount of electricity supplied by the electric utility to the customer-generator annually over the previous three years. This provision aims to align system size with historical consumption, preventing over-generation beyond a reasonable margin. You should consult your utility for precise calculation methods for your specific historical usage.

How Excess Generation is Credited

When a net-metered solar facility generates more electricity than the customer consumes, the excess electricity is converted into a monetary credit. This credit is valued at the energy component of the electric utility's standard service offer (SSO). The rule specifies that this monetary credit continuously carries forward on the customer-generator's future bills. This ensures that any surplus generation retains value and can offset future electricity charges. The rule also prohibits electric utilities from imposing charges related to the electricity a customer-generator feeds back to the system.

Ownership of Renewable Energy Credits (SRECs)

Under OAC 4901:1-10-28, renewable energy credits (SRECs) associated with a customer-generator's net metering facility are the property of the customer-generator. This ownership stands unless a separate contract specifies otherwise. This provision allows customer-generators to retain or sell their SRECs, providing an additional potential revenue stream from their solar investment.

Considerations for Solar Installation in Ohio

Navigating solar installation in Ohio involves understanding both net metering and interconnection rules. The Ohio Administrative Code cross-references Chapter 4901:1-22 for interconnection guidelines. This means that while OAC 4901:1-10-28 covers net metering specifics, you will also need to comply with separate interconnection requirements.

For those considering a solar installation, understanding these regulations is crucial for proper system sizing and financial planning. You can explore more about interconnection processes in our guide on Ohio PUCO Level 1 OAC 4901:1-22-06 Interconnection Guide. Comparing Ohio's rules with other states, such as Pennsylvania PUC 52 PA Code 75.13 Solar Net Metering Guide or Washington RCW 80.60.010 Solar Net Metering and Capacity Limits Guide, can provide broader context. For assistance with system design, you can use a solar sizing tool to estimate your energy needs and potential system output.

Understanding Rule Scope and Avoiding Misinterpretation

Regulatory documents, such as OAC 4901:1-10-28, are precise. It is important to interpret the text literally. For instance, the rule explicitly states that a customer hosting or leasing third-party owned generation equipment on their premises is considered a customer-generator. This clarifies eligibility for net metering benefits even with leased systems. Similarly, the definition of "premises" includes contiguous lots, even across easements or public thoroughfares, which can impact where solar arrays may be sited relative to the meter. Always refer to the exact wording of the code and consult with your utility or a qualified professional for specific applications.