To many, solar power’s biggest selling point isn’t that it’s “green.” It’s that, in a growing number of places, it’s simply the cheapest way to make electricity.
One reason is baked into the physics. Solar panels don’t require fuel deliveries, and sunlight doesn’t come with a monthly invoice. Once a solar project is built, most of the cost is up front — equipment, labor, permitting and financing — while operating costs are comparatively low.
That structure can be a financial advantage in an energy world where fossil-fuel prices can spike quickly and unexpectedly.
That advantage shows up in “levelized cost of energy” estimates, a common way analysts compare the lifetime cost of generating electricity from different sources.
Utility-scale solar’s cost range typically comes in below many conventional options on an unsubsidized basis, according to Lazard’s annual LCOE+ analysis.
Costs also have a long track record of falling as manufacturing scales and technology improves. The International Renewable Energy Agency reported that in 2023 the global weighted-average levelized cost of electricity for newly commissioned utility-scale solar PV fell to $0.044 per kilowatt-hour, and that utility-scale solar posted one of the largest year-over-year declines among major new-build power sources.
In other words, for many grids, solar is competing as a “new-build” option — not against the operating costs of an already-paid-for plant, but against what utilities would pay to build the next unit of generation.
From that perspective, the International Energy Agency says utility-scale solar is the cheapest source of electricity generation in most parts of the world, even as developers in some countries face rising permitting and siting challenges.
The economics are helped by solar’s modular nature. A utility can build a 50-megawatt project and expand later, instead of betting everything on a single massive facility.
That can reduce the risk of overbuilding — and it lets developers learn and improve from project to project, which tends to drive costs down over time.
In the United States, the National Renewable Energy Laboratory’s Annual Technology Baseline provides standardized cost and performance assumptions that show how those economics can pencil out, including typical operations and maintenance ranges for utility-scale PV. Those expenses are real — panels get dirty, inverters fail, crews are needed — but they’re not in the same category as fueling a gas plant for decades, according to NREL.
There are also “soft” cost advantages that don’t always show up in a simple cents-per-kilowatt-hour comparison. Solar can be built relatively quickly, which matters when electricity demand is rising and timelines are tight.
And because it’s a domestic, fuel-free resource once installed, solar can act as a hedge against volatile commodity markets — a feature utilities and large customers often value when signing long-term contracts.
None of this means solar is automatically the best answer everywhere. Its output varies with weather and time of day, which can add system costs for flexibility, transmission upgrades, and storage — and those costs depend heavily on local grid conditions.
Lazard’s analysis, for example, shows that pairing solar with storage raises costs compared with standalone solar, reflecting the price of “firming” power for evenings and peak demand.
Still, the direction of travel is hard to miss: solar’s core technology keeps getting cheaper, and its fuel stays free.
For households, businesses and utilities trying to control long-term energy bills, that’s a cost advantage that doesn’t require a climate argument to make sense.
