The most consequential piece of grid infrastructure installed this year might be a sign-up form.

Utility Dive made a case today I hadn’t seen stated quite this plainly: the binding constraint on turning EVs, home batteries, and rooftop solar into dispatchable grid capacity isn’t the hardware anymore. It’s enrollment. A battery sitting in someone’s garage that could shave a peak might as well not exist if the owner never clicked through the utility’s app. The frontier of grid flexibility has quietly become a customer acquisition problem, the kind of thing a startup growth team would recognize on sight, and utilities (historically not staffed for growth teams) are only now learning to solve it.

Australia is the proof of concept. Nearly a million homes there installed batteries in the past year alone, on top of 990 watts of rooftop solar per person, more capacity than the entire national coal fleet. A guy named Sam opened his power bill and found $500 in credit because his battery and EV made him a grid asset instead of just a customer. That took two decades of deliberate incentive design, not a killer app.

Meanwhile the other bottlenecks don’t care how good your onboarding flow is. DOE says transmission congestion cost $12 billion in wholesale power last year, a problem no number of enrolled batteries fixes if the wires between regions are simply full. And a KEMA Labs piece, breathless in a way that made me smile (“a stress test the system appears ill-prepared to pass”), points at something real underneath the drama: transformer lead times past two years, capacity thinned out since 2022.

Three chokepoints, three unrelated fixes: a UX problem, a permitting problem, a manufacturing problem. Nobody gets to solve just one and call it done.

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