That emphatically does not mean you can power an American house for $2,500. A safe, code-compliant system also needs inverters, battery-management electronics, enclosures, racking, wiring, breakers, controls, permits, inspections and installation. American tariffs, certification, labor, distribution and financing can multiply the price of the raw components. The point is not that household electricity has suddenly become almost free. It is that the manufactured technology has become cheap enough to change what the rest of the electrical system ought to look like.
The obvious conclusion would be that everybody should simply go off-grid. That would be wrong. An array sized to equal a household’s annual consumption still has to live through December, snow and several cloudy days in a row. Batteries can carry electricity from afternoon into evening, but buying enough of them to survive a week of miserable winter weather is a different proposition. Complete self-sufficiency gets expensive because you end up building for rare conditions.
So perhaps the interesting question is not how to get rid of the grid. It is how to change what the grid does.
Imagine a house that produces most of its annual electricity itself, uses a battery to carry solar power through the evening and overnight, and buys utility electricity during several lousy winter days. There is no need to buy enough storage for every imaginable weather event because the grid already exists. On the handful of hot afternoons when the utility itself is desperate for capacity, the relationship can reverse: the house can discharge part of its battery or simply stop drawing from the grid.
For most of the electrical age, the utility was the primary power source and anything we generated locally was backup. Cheap generation and storage make it possible to imagine that relationship beginning to reverse.
The more I looked at the numbers, however, the more I realized that this is not really a story about solar panels. It is a story about time.
Ontario makes the point almost absurdly clear. Under its Ultra-Low Overnight rate, electricity costs 3.9 Canadian cents per kilowatt-hour between 11 at night and 7 in the morning. From 4 to 9 on a weekday afternoon, it costs 39.1 cents. Other charges still appear on the bill, but the electricity itself is priced at exactly ten times as much during the evening peak.
The electrons are not ten times better at five in the afternoon. What is scarce is the ability to produce and deliver enough of them when everybody wants them at once.
For more than a century, utilities had little choice but to make supply follow demand. The grid had to be large enough for the hottest afternoon, the coldest morning and the dinner hour when millions of people arrived home and turned things on. Power plants, transmission lines, substations and transformers had to be built for those peaks even if some of that capacity was crucial only a few hours a year.
That made sense when customers could not store meaningful amounts of electricity and almost nothing on the demand side could respond automatically. That is changing quickly. Electric cars can charge overnight. Water heaters can run before the peak. Warehouses can pre-cool. Batteries can charge when electricity is abundant and discharge when it is scarce. Some industrial processes can move by an hour or two, and some computing can move in both time and geography.
For the first time, we can make some demand follow supply instead of requiring all supply to follow demand.
That may matter more than shaving another penny from the cost of a solar panel. If enough electricity use can move away from the handful of hours when the system is under the most strain, we may be able to avoid building some of the generating capacity, transformers and wires that would otherwise be required to satisfy everyone’s maximum demand at exactly the same moment.
This also explains why falling solar costs have not produced equally dramatic declines in electric bills. IRENA estimates that new utility-scale solar cost about $44 per megawatt-hour globally in 2025, while American households pay several times that amount for delivered electricity. Those are not contradictory numbers. One is the cost of generating electricity; the other includes the entire system required to deliver it reliably whenever the customer wants it.