A plug-in solar solution that utilities and lawmakers can agree on
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- Utah became the first state to pass a plug-in solar law in 2024, allowing residents to plug solar-generating devices into home sockets, with Colorado, Maine, Virginia, California, New York, and New Jersey following within months.
- California's plug-in solar bill passed the state Senate 35-1 with support from Sen. Scott Wiener, while New York and New Jersey bills passed their legislatures this summer and now await governor signatures.
- Residents in states with plug-in solar laws stand to save $175 to $340 annually while reducing reliance on fossil fuels, per the source.
- A Lawrence Berkeley National Laboratory article in the peer-reviewed journal Energies found utilities acknowledged plug-in solar could reduce or defer future infrastructure upgrade costs while offering grid impacts similar to utility-scale solar.
- Germany has more than 5 million households with plug-in solar installations and has recorded no incidents affecting homes or energy infrastructure, the source notes.
- CraftStrom CEO Stephan Scherer argues the 1,200-watt cap in Utah's law is unsafe because most systems plug into shared branch circuits that could overload a 15-amp circuit and create a fire risk; he also flags "breaker masking" that can let wiring overheat without tripping a breaker.
- Scherer recommends a 420-watt safe harbor tier requiring no power control system, systems above 420 watts to use PCS on non-dedicated circuits, and a 400-watt cap on electricity exported to the grid; Colorado and Maine have already adopted tiered definitions in their new laws.
Why it matters: For plug-in solar to scale safely, state legislators drafting the next wave of bills need to adopt tiered wattage definitions and a 400-watt export cap rather than copying Utah's 1,200-watt limit, because the higher cap can overload home branch circuits and invite utility pushback that stalls adoption — Colorado and Maine's tiered approach is becoming the model other states weigh this fall.
