Do I Need a Permit for Plug-In (Balcony) Solar in Utah?
Quick Answer
No — portable plug-in solar under 1,200 watts needs no permit, inspection, or utility agreement.
What HB 340 Changed
In 2025 Utah became the first U.S. state to explicitly legalize plug-in solar. House Bill 340 (Solar Power Amendments) was signed in March 2025 and took effect in May 2025, creating a new legal category called a 'portable solar generation device.' Devices that fit this category are exempt from the permitting and utility processes that normal rooftop solar still requires.
The 1,200-Watt Rule
To qualify, a system must have a maximum output of 1,200 watts of AC power, plug into a standard 120-volt household outlet, include built-in anti-islanding protection (so it shuts off during a grid outage), meet the most recent National Electrical Code, and be certified by a nationally recognized testing lab such as UL. If your setup meets all of these, it is treated as a plug-in appliance rather than a grid-tied solar installation.
What's Exempt — and What Isn't
Inside the 1,200W box you need no building permit, no electrical permit, no inspection, and no interconnection agreement — and the utility cannot charge a fee, require pre-approval, or demand extra controls. Step outside the box, though, and the normal rules return: anything hardwired, roof-mounted, or above 1,200W is standard solar and needs both a building and electrical permit plus a utility interconnection agreement. See our rooftop solar guide for that path.
The Catch: UL-Certified Devices Are Scarce
Here is the gotcha the headlines miss. The law requires UL certification, but the relevant standard (UL 3700) was only finalized in December 2025, and as of early 2026 essentially no products have completed certification yet. So plug-in solar is legal in Utah before fully compliant, certified devices are widely available. Buy only a UL-certified unit — an uncertified device does not qualify for the exemption and can create real safety and insurance risk.
Renters and HOAs
This law is a big deal for people who can't do rooftop solar. Renters can install a balcony system as long as they have access to an outdoor balcony or patio and a standard 120V outlet, with no landlord approval required. HOAs are not explicitly addressed in HB 340, but the law's broad language gives homeowners standing to challenge an HOA that tries to ban a qualifying plug-in system.
Utility Pushback
Be aware that Rocky Mountain Power objected to HB 340 and has been reluctant to honor it, arguing it wasn't consulted. If your device meets the 1,200W standard, the utility is not legally allowed to require an interconnection agreement or block it — know your rights under the statute if you get pushback.
Bottom Line
Plug-in solar up to 1,200W is genuinely permit-free in Utah, the first state to allow it. The real hurdle isn't paperwork — it's finding a UL-certified device, since that certification standard was only finalized in late 2025.