Solar PV and wind are now the cheapest sources of power globally, with co-located hybrid systems increasingly delivering round-the-clock electricity at fossil fuel-competitive costs in high-resource regions, according to a new report by the International Renewable Energy Agency (IRENA).  
In its report titled ‘24/7 renewables: The economics of firm solar and wind’, IRENA highlighted that while renewable energy deployment has scaled rapidly on the back of falling costs, the next phase of the energy transition will be defined by system adequacy and flexibility – ensuring clean electricity is available whenever and wherever it is needed. 
The report introduced a new project-level metric, “firm levelised cost of electricity (LCOE)”, to assess the cost of delivering continuous electricity from hybrid systems combining solar PV, onshore wind and battery energy storage systems (BESS).  
According to IRENA’s analysis, firm renewable electricity costs have declined rapidly across all major technologies and markets, driven primarily by sharp reductions in solar PV and battery storage costs. 
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In high-quality solar resource regions, co-located solar PV and storage systems are already capable of delivering firm electricity at costs below fossil fuel benchmarks. The report said that in 2025, firm LCOE for solar-plus-storage systems in strong solar and wind regions ranged from around US$54-82/MWh, down from more than US$100/MWh in 2020. 
Further cost reductions are expected, with IRENA projecting firm LCOE could fall by around 30% by 2030 and approximately 40% by 2035, bringing costs below US$50/MWh at the best-performing sites. 
The agency’s analysis of 252 utility-scale solar PV projects commissioned in 2024 in China shows that a significant majority can deliver firm electricity below US$100/MWh, with minimum firm costs as low as US$30/MWh at a 90% reliability level. Even at 99% reliability, costs rise only modestly to around US$46/MWh. 
Between 2010 and 2024, global weighted average total installed costs for solar PV fell by 87% to US$708/kW, while levelised costs of electricity declined by 90% to US$44/MWh. 
Battery energy storage systems experienced even steeper declines, with costs falling by 93% over the same period from US$2,634/kWh in 2010 to US$197/kWh in 2024. Industry data cited in the report suggests that battery system prices fell by around 30% in 2025 alone, reaching their lowest recorded levels. 
The report stated that in 2025, utility-scale solar PV and onshore wind both cost around US$40/MWh globally, less than half the cost of new combined-cycle gas turbines, which exceeded US$100/MWh. 
In China, firm solar-plus-storage already undercuts both new coal and gas generation, while in markets such as Saudi Arabia, firm solar electricity is approaching parity with gas-fired generation even where fuel costs are relatively low. 
IRENA also noted that in several economies, co-located wind and solar systems with storage are now competitive with the operating costs of existing fossil fuel plants, challenging not only new build economics but also the viability of continued operation of legacy assets. 
The report concluded that the pace of deployment of firm renewable electricity systems will be one of the most consequential factors shaping the global energy transition in the coming decade. 
To read the full version of this story, visit PV Tech, where it was originally published.

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