Page in progress. Crown-jewel pillar — full draft coming once Bat reviews tone and Rocky Mountain Power’s responses are in.

TL;DR: Utah HB 340 (effective May 2025) legalized plug-in solar systems up to 1,200W AC. No permits, no utility approval, no interconnection agreement. Utah is currently the only US state where this is fully legal.

What HB 340 changed

(Section in progress — bill citation, ceiling, exemptions, timeline)

What’s required: a smart meter

Rocky Mountain Power needs a bidirectional meter to read your offset correctly. See the RMP onboarding guide for the request flow.

What you give up

No net metering — offset only, no credits
1,200W AC ceiling — bigger systems still need permits + interconnection
No commercial — residential only

Germany was first

Plug-in / “balcony” solar has been legal in Germany for years. Over a million systems are installed there. Utah is the first US state to follow.

Sources

(Coming: bill text, Utah State Legislature link, Rocky Mountain Power filings, KUER coverage)