A new report from global energy think tank Ember says batteries have officially hit the price point that lets solar power deliver affordable electricity almost every hour of the year in the sunniest parts of the world.

The study looked at hourly solar data from 12 cities and found that in sun-soaked places like Las Vegas, you could pair 6 gigawatts (GW) of solar panels with 17 gigawatt-hours (GWh) of batteries and get a steady 1 GW of power nearly 24/7. The cost? Just $104 per megawatt-hour (MWh) based on average global prices for solar and batteries in 2024. That’s a 22% drop in a year and cheaper than new coal ($118/MWh) and nuclear ($182/MWh) in many regions.

Ember calls it “24/365 solar generation,” and it’s not just a theoretical model. Cities like Muscat, Oman, and Las Vegas can hit that steady power mark for up to 99% of the hours in a year. Hyderabad, Madrid, and Buenos Aires can reach 80–95% of the way there using that same solar-plus-storage setup with some cloud cover. And even cloudier cities like Birmingham in the UK can cover about 62% of hours annually.

“This is a turning point in the clean energy transition,” said Kostantsa Rangelova, global electricity analyst at Ember. “Around-the-clock solar is no longer a distant dream; it’s an economic reality of the world. It unlocks game-changing opportunities for energy-hungry industries like data centres and manufacturing.”

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This is an enormous opportunity for sunny regions in Africa and Latin America. Manufacturers and data centers could also tap into solar-plus-storage and skip long waits (and big bills) for new grid connections.

It’s not a silver bullet for grid-wide reliability, but it lets solar carry much more of the load, especially where sunshine is abundant. Batteries also help avoid costly grid expansions by allowing up to five times more solar to plug into existing connections.

In 2024 alone, global battery prices dropped 40%, which helped drive down solar-plus-storage costs by 22%. Record-low tenders from countries like Saudi Arabia point to even cheaper options coming soon.

Real-world projects are already online: The UAE built the world’s first gigawatt-scale 24-hour solar facility. Arizona is already home to solar-powered data centers. And as battery tech keeps improving, round-the-clock solar could become the backbone of clean energy systems in the world’s sunniest places.

Read more: This solar canopy cools wastewater and powers a city utility

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