Balcony Solar in Colorado
Colorado set the highest cap in the country — 1,920 watts — under HB26-1007. Devices over 391 W must be labeled and listed by a testing lab, and utilities must accept meter-collar connections. Most market provisions start January 1, 2027.
Reviewed August 6, 2026 against primary sources. Laws change — the sources below let you re-check.
Does Colorado require UL 3700?
No — the statute does not name UL 3700.
labeled and listed by a nationally recognized testing laboratory.
Does not name UL 3700 — the bill cites UL 414 only for meter-collar adapters. After January 1, 2027, selling or leasing a device over 391 W that is not UL labeled and listed is prohibited.
Why this matters: “certified by UL” names an organization; “certified to UL 3700” names a plug-in-PV standard. They are not the same claim. Full explainer →
What the law does
- Must include a feature that prevents the device from energizing the grid during a power outage (anti-islanding).
- Devices at or below 391 W are exempt from PV-install and product-listing/wiring provisions.
- Utilities — investor-owned, municipal, and cooperative — must accept meter collars.
What's still unsettled
- The 1,920 W cap is not labeled AC or DC in the statute.
- Most market provisions don't take effect until January 1, 2027; PUC meter-collar rules are due December 31, 2026.
Before you buy in Colorado
A state law opening the door is only one of three gates. The gear must actually be certified to what the law asks for — and today no plug-in kit sold in the US carries UL 3700 yet. Your utility may still want notification. If you rent, your lease or HOA is a separate yes. What "UL 3700 certified" really means →