Battery Storage

Battery Attach Is the Real Solar Growth Story in 2026

Quick answer

While residential solar installs are forecast down 18% to 21% in 2026, national battery attach rate hit 45% in Q1 2026, up from 38% a year earlier, and residential battery storage grew 51% year over year in 2025 to 3.1 GWh. Batteries, not solar generally, are the part of this market that is actually growing, driven largely by California's NEM 3.0 rules making storage close to mandatory for system economics, and that shift changes what a well-qualified solar appointment should look like.

By VA Horizon Team · July 20, 2026 · 6 min read

The Numbers That Don't Fit the Contraction Story

Residential solar installs are forecast down 18% to 21% for 2026. Against that backdrop, national solar-plus-storage attach rate hit 45% in Q1 2026, up from 38% a year earlier, and residential battery storage grew 51% year over year in 2025, to 3.1 GWh. That is not a small trend inside a shrinking category. It is genuine growth sitting directly next to genuine contraction, and the two numbers describe different products, not the same one.

Why Batteries Are Growing While Solar-Only Isn't

California's NEM 3.0, formally the Net Billing Tariff, cut solar export credits by roughly 75% starting in April 2023. A Court of Appeals upheld the rule in March 2026, and the NEM 2.0 grandfathering window that let older systems keep the old credit structure closed on April 15, 2026. Under NEM 3.0's math, exporting excess power to the grid pays far less than it used to, which makes storing that power in a battery and using it at night, instead of selling it back cheap, functionally required for a system to pencil out the way it once did without one.

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What This Means for Appointment Quality

A solar-only pitch in a market shaped by NEM 3.0 is increasingly a weaker pitch than a solar-plus-battery one, because the standalone-solar economics that used to sell the deal on their own don't hold up the same way anymore. That is a real qualification signal, not a sales gimmick: an appointment where the homeowner is in a NEM3-affected market, or has already expressed interest in storage, is a materially different, higher-value conversation than a generic solar consult.

Battery Interest as a CLV Lever

Forward-thinking installers are already shifting from one-time-sale economics to customer lifetime value, layering batteries, EV chargers, and roofing onto the original solar sale to spread acquisition cost across more revenue per household. Battery attach fits directly into that model: it is both a real 2026 growth line and a genuine second product to sell into the same appointment, which is a better answer to rising CAC than simply trying to close more solar-only deals faster.

Where This Leaves the Rest of the Market

It's worth being precise about how narrow this growth pocket is. Commercial and industrial solar grew 6% in 2025 but is forecast to decline 13% in 2026, driven largely by California policy changes, the same regulatory shift that's pushing residential battery attach up. Growth in this market in 2026 is specific, not general: batteries are up, residential rooftop overall is down, and C&I is turning down too. That specificity is exactly why qualification criteria matter more than volume right now, and why a blanket "solar is booming" pitch would be wrong on its face.

Sources

The external data in this article draws on the sources below. Figures described in the text as estimates or industry triangulations are directional and are not attributed to a single dataset.

FAQ

Is anything actually growing in solar right now?

Yes, battery storage specifically. National solar-plus-storage attach rate hit 45% in Q1 2026, up from 38% a year earlier, and residential battery storage grew 51% year over year in 2025, even as overall residential solar installs are forecast down 18% to 21% for the year.

What is battery attach rate?

The share of solar installations that are paired with a battery storage system rather than solar panels alone. It reached 45% nationally in Q1 2026, up from 38% a year earlier.

Why does NEM 3.0 make batteries more important in California?

NEM 3.0 cut solar export credits by roughly 75% starting in April 2023, which makes exporting excess power to the grid pay far less than it used to. Storing that power in a battery and using it later, instead of exporting it cheap, has shifted from optional to close to required for a California system's economics to work.

Should solar appointment criteria include battery interest?

It is a reasonable qualification signal in 2026. An appointment where the homeowner is in a NEM3-affected market or has already expressed storage interest is a genuinely different, and often higher-value, conversation than a generic solar-only consult.

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