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Maguire: World solar power set to surpass nuclear generation for the first ever

This summer, the global electricity generated by solar farms will surpass the output of nuclear reactors. This is a significant milestone in the continued growth of solar energy within the global energy system.

Solar farms generate electricity only during daylight hours, so their annual output is far behind that of wind, nuclear, and hydroelectric systems.

Solar farms have started to exceed global wind production during the summer of last year in the northern hemisphere.

Solar farms are now set to briefly eclipse global hydroelectric systems during peak solar production.

CAPACITY SURGE

Solar systems are relatively inexpensive and can be connected quickly, which is why utilities have added twice as much capacity as other sources of power to their generation networks over the last decade.

According to Ember, the energy think-tank, by 2024 there will be 1,866 gigawatts of utility-scale solar power generation embedded in global electrical systems.

This was the biggest capacity increase of all major power sources in that time period.

Wind power has seen the second largest increase in capacity, by a factor 3.2. All other sources of generation have seen a capacity less than doubled.

Solar power's capacity in terms of total was third among the major sources of power generation by 2024. It was behind coal's 2,174 gigawatts (GW) and natural gas's 2,055 gigawatts, but above the 1,283 gigawatts of hydroelectric and 1,132 GW wind power.

OUTPUT AFFECT

Since the beginning of this decade, peak solar electricity production has reached new heights every year due to the steadily increasing solar capacity footprint.

Ember data show that utility-scale solar power generation has increased by 25% per year on average since 2020.

Solar generation in the first three month of 2025 was 34% higher than in the same period of 2024. This was due to the widespread increase in generating capacities in many key regions.

If the monthly solar production continues to be around 30% higher than in 2024's same month, then global solar electricity output will exceed 260 Terawatt Hours (TWh), per month, during June, July, and August this year.

These output totals are likely to be far greater than the output of the nuclear reactor fleet in the world, which has a peak monthly production of 252 TWh and an average monthly output 223 TWh by 2024.

As daylight hours begin to decrease in the northern Hemisphere, home to three quarters of all solar farms on the planet, solar generation is expected to fall below 250 TWh by September.

Solar farms will supply more electricity than nuclear reactors in the world for the first ever during the summer of 2015. This is a new benchmark for the solar industry.

UTILITY SCALE

Utility operators face both challenges and opportunities as a result of the constant growth in solar energy supplies.

Solar farms are intermittent and can produce more power than is needed at peak times, but then stop production completely during the night. This means that real-time balancing of systems with other sources of energy is necessary.

The rapid growth of solar power in national grids also forces utilities to upgrade their grids so that they can better handle fluctuations in renewable energy and optimize the overall flow of electricity over time.

A growing number of utilities are also deploying batteries to store excess solar power during times when it's not needed, then dispatching that power at peak electricity demand.

The "solar plus battery" model allows utilities to limit the use of fossil-fuels in their generation mix, which in turn can save money when gas and coal prices increase and reduce emissions.

When solar farms reach new output records this summer, utilities will be able reduce nuclear production at peak times, then increase it again when the solar output drops during the night.

It could help utilities reduce their reliance on fossil-fuels, while maximising clean energy generation. This would also set the stage for future growth in solar power generation and usage.

These are the opinions of the columnist, an author for.

(source: Reuters)