A: Plug-in solar laws differ state-by-state but the core goals of each bill are the same: Define a new class of small solar systems, distinguishing them from the larger rooftop arrays that existing rules were designed for. Exempt small systems from utility interconnection requirements and approvals, eliminating permitting delays and expensive interconnection fees. Require product safety certifications, protecting both consumers and utility workers.

In states that have passed plug-in solar legislation, utilities are explicitly prohibited from requiring customers to pay any fee or charge related to the system.

In states that have passed plug-in solar legislation, utilities are explicitly prohibited from requiring customers to obtain utility approval before installing or using the system.

This varies by state. Some plug-in solar laws include renter protections that limit a landlord's ability to restrict use of a qualifying system. Check your state's specific legislation for details.

Wattage limits vary by state. Most plug-in solar laws define qualifying systems as those up to 1,200W, including Utah, Virginia, Maine, and Maryland. Colorado is the exception, allowing systems up to 1,920W, the highest limit of any state to have passed plug-in solar legislation. Check your state's specific legislation for details.

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