How to measure grid utilization

Virginia has a new law requiring utilities to measure how much of the power grid actually gets used, rather than just building new infrastructure to handle rare peak demand. By mid-October, the state's two big utilities, Dominion Energy and Appalachian Power, must submit plans on how they'll do this to regulators. Other states, including Colorado, Maryland, Michigan, Minnesota, Montana, New Jersey, and North Carolina, are watching closely and may follow with similar rules.

The catch is that no one has agreed on how to measure "grid utilization." A nonprofit group called the Utilize Coalition, whose members include Google and Tesla, just released its own proposal for tracking how much grid capacity sits unused at different times and places. The idea is that this data could help identify where batteries or other flexible technology could soak up spare capacity, versus where new poles and wires are genuinely needed. Supporters argue that using the existing grid more efficiently, rather than always building new, could save utility customers significant money, since new demand could be served at lower cost.

None of this changes anything for homeowners right now. It's a policy and planning debate playing out among utilities, regulators, and advocacy groups. But the outcome could eventually shape how utilities justify rate increases for new infrastructure, and how much room the grid has for things like electric vehicle charging, home batteries, or rooftop solar without costly upgrades. Homeowners interested in these issues can watch whether their own state follows Virginia's lead.