What Is NEM Grandfathering?
Once a utility or regulator closes its older net metering program to new customers, NEM grandfathering preserves the original terms for systems that met the cutoff, usually for a defined period. The trigger, the length, and whether the protection survives a home sale or an expansion all vary by state and utility.
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Once a utility or regulator closes its older net metering program to new customers, NEM grandfathering preserves the original terms for systems that met the cutoff, usually for a defined period. The trigger, the length, and whether the protection survives a home sale or an expansion all vary by state and utility.
NEM Grandfathering explained
Regulators typically define the cutoff by application date or by interconnection date, set a window for qualifying systems to be completed, and publish how long legacy terms last. Customers who qualify keep the older export credit and billing treatment, while everyone after the cutoff lands on the new tariff. The details live in the regulator’s order and the utility’s tariff sheets, not in marketing copy.
Grandfathering shapes two kinds of calls. Prospects who already have solar ask about adding panels or a battery, and buyers or sellers of homes with older systems ask what the legacy terms are worth. In both, the question is whether changing the system, moving the account, or transferring the home ends the protection. Setters should log existing solar and an approximate install year; closers confirm the details with the utility.
Edge cases decide outcomes. Some states let legacy terms pass to a home buyer, others end them at sale. An expansion can reset eligibility if it crosses a size threshold, and a battery added later may or may not count. A rep who guesses does more harm than one who says the utility must confirm. Watch for false urgency too: a pitch to sign today before the rules change is only true if a regulator’s written order says so.
Why it matters when you're buying
Some of the most valuable solar prospects already own a system on favorable legacy terms. Recognizing that, asking the right questions before suggesting an expansion, and never pressuring anyone with an invented cutoff protects the homeowner’s existing benefit and the company’s reputation at the same time.
Frequently Asked Questions
What happens to grandfathered net metering when I sell my home?
Does adding a battery or panels end NEM grandfathering?
Can the deadline to qualify for grandfathering be extended?
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