Quick definition
For decades, solar power cost meaningfully more per kWh than buying electricity from the utility, and tax credits and rebates existed largely to help close that gap. Grid parity marks the point where that gap closes entirely on its own, where solar's true cost, measured using its levelized cost of energy, matches or beats the standard utility rate without needing any subsidy to make the comparison work.
Most of the US and Canada crossed this threshold years ago, though the exact economics still vary a lot by local utility rates and solar resource.
At a glance: falling panel and installation costs over the past two decades are the main reason most regions now sit below grid parity, meaning solar is often already cheaper than utility power before any incentives are applied, a decline NREL's own solar industry cost benchmarking has tracked closely year over year.
Why it matters
Grid parity matters as a milestone because it reframes the entire conversation around why someone installs solar. Before grid parity, the case for solar leaned heavily on incentives and environmental motivation, since the raw economics without subsidy often didn't quite pencil out. Past grid parity, solar makes financial sense as a straightforward cost comparison, tax credits and rebates just make an already-good deal better.
Because grid parity depends on local utility rates, it isn't a single national milestone that happened on one specific date. A region with historically cheap electricity, often areas with abundant hydroelectric or older, already-depreciated power infrastructure, sets a tougher bar for solar to clear than a region paying high retail electricity rates. This is part of why some areas reached grid parity years before others, and why a handful of regions with unusually cheap utility power are still working toward it.
It's worth being precise about what grid parity does and doesn't claim. It's a statement about the underlying cost of generating a kWh of solar power versus buying one from the utility, not a guarantee that every individual solar quote will beat every individual electric bill. Installation quality, system sizing, roof conditions, and financing terms still shape what any specific homeowner actually pays. The Solar Energy Technologies Office sets cost targets for solar electricity and tracks progress toward them. To see Grid parity in a real example, the cash purchase vs financed payback comparison in our Financing section applies it to a working system.
Where you'll see this
The levelized cost of energy calculator works out solar's true per-kWh cost for your specific system, the exact number grid parity compares against your utility's rate.
Since grid parity varies so much by location, the payback period by region grouped tool shows how quickly solar pays for itself across different regional utility rate environments.
This term comes up in solar industry reports, in regional market analysis, and any broader discussion of why solar adoption has accelerated as underlying costs have fallen over the past two decades, a system-sizing question worth grounding with the solar panel calculator for your own specific roof and usage.
Related terms
Frequently asked
In most regions, yes, solar's levelized cost has fallen well below typical retail electricity rates over the past decade, even without factoring in incentives. Some specific areas with unusually cheap utility electricity or high installation costs may still sit closer to the line.
Not universally. Grid parity is inherently local, since it depends on your specific utility's rates, your local solar resource, and your installation cost. A region with very cheap utility electricity might have a higher bar for solar to clear than a region with expensive utility rates.
Grid parity is typically discussed as the point solar becomes competitive without needing incentives at all. Many homeowners' actual, incentive-adjusted cost is already well below utility rates, but true grid parity refers to the underlying unsubsidized economics.
Solar panel manufacturing costs fell dramatically over the past two decades as production scaled globally, while installation costs and financing options also improved. That combination steadily pushed solar's levelized cost down until it crossed below typical utility rates in most regions.