Utah went first. What happened after HB 340

What Utah did

Representative Raymond Ward's HB 340 passed the Utah House 72–0 and the Senate 27–0, was signed by Governor Cox in March 2025, and took effect on 7 May 2025.

The structure is the one California is now copying: a device under 1,200 watts, connecting through a standard 120-volt receptacle, certified by a recognised testing laboratory and compliant with the National Electrical Code, is exempt from interconnection requirements.

The detail that matters most: Rocky Mountain Power, the state's main utility, took no position. It had been involved in drafting the language. Compare that with California, where SCE and SDG&E opposed SB 868 outright — and the bill passed anyway, but with a longer fight and more amendments.

What happened next

Manufacturers moved. EcoFlow launched its STREAM range into the US with Utah as the initial market. CraftStrom expanded there. The National Caucus of Environmental Legislators, which tracks this policy area, notes that the model — limiting interconnection requirements and professional installation costs — can cut prices for plug-in systems by roughly half.

That's the important mechanism, and it's worth being precise about it. The law didn't subsidise anything. It removed the process cost. An interconnection application, an inspection, and an electrician are a large fraction of a $600 purchase, and deleting them is equivalent to a very large discount.

The certification bottleneck showed up first there. Utah's law required certification before UL had a plug-in photovoltaic standard, which meant early sellers were pointing at UL 1741 inverter listings. UL 3700 arrived in January 2026 and started resolving that.

Other states followed. By mid-2026 around eight or nine states had enacted plug-in solar frameworks — Colorado, Connecticut, Maine, New Jersey and Virginia among those adding them in the second quarter of 2026. Bills were active in a dozen more.

What we don't know about Utah

We'd like to tell you how many devices Utah has installed, whether there have been any incidents, and what the average customer saved. We can't, because Utah doesn't run a registration database the way Germany does, and nobody has published a good count.

That absence is itself a finding of sorts. The German data exists because registration is mandatory and centralised. The American approach — deliberately, in the name of removing friction — produces no data at all. Which means in three years, when California's exemption comes up against its 2030 sunset, there may be no dataset to argue with.

Why California is different

Scale. Utah has about 1.1 million households. California has about 13.55 million, of which roughly 6 million rent. California is not the next market, it's the market.

Rates. Utah's electricity is inexpensive. California's is among the most expensive in the country. The same panel is worth roughly twice as much here, which changes the buying decision entirely.

Utility posture. Rocky Mountain Power helped write Utah's bill. SCE and SDG&E opposed California's. That difference will probably show up in how registration processes get built and how enthusiastically they're publicised.

Housing. Utah is largely single-family and owner-occupied. California is the opposite in exactly the places where plug-in solar makes most sense. That's an argument for a larger market and a harder one — more renters means more demand and more landlords to ask.

What it means for you

Mostly: this isn't an experiment. There's a year of US market history, a decade of German history, and a set of manufacturers who've already built products for these rules. California isn't going first, it's going biggest.

Where SB 868 stands →