On April 22, 2025 C.E., Britain’s electricity grid ran at 98.8% zero-carbon power for a half-hour window — the highest share ever recorded — while gas fell to just 1.2% of the energy mix. The next day, solar generation hit a new peak of 15.4 gigawatts. Together, the milestones mark a striking shift in how one of the world’s largest economies powers itself.
At a glance
- Zero-carbon record: Britain’s National Energy System Operator ran the transmission network at 98.8% zero-carbon between 15:30 and 16:00 on April 22, topping the previous record of 97.7% set just three weeks earlier.
- Solar generation peak: Distribution-connected solar reached 15.4 GW on April 23 — surpassing 14.8 GW set the day before and a prior record of 14.4 GW set on April 7.
- Gas at historic low: On the same day the zero-carbon record was set, gas supplied only 1.2% of Britain’s electricity at both transmission and distribution levels — enough clean power to serve nearly all 28 million homes and 5 million businesses across the country.
A grid that keeps breaking its own records
The April 22 milestone didn’t arrive in isolation. Just four weeks earlier, on March 25, Britain’s wind farms generated 23.9 GW — a record for that energy source. Solar then broke its own peak twice in two consecutive days. The frequency of these records reflects a grid that has been systematically rebuilt over 25 years.
In 2000 C.E., renewables accounted for just 3% of Britain’s electricity. By 2025 C.E., that figure reached 44% — with solar seeing the single largest year-on-year jump, up nearly a third from 2024 C.E. That leap was partly driven by 2025 C.E. being the U.K.’s sunniest year on record.
Britain also has five of the world’s largest offshore wind farms in its coastal waters. The U.K. government’s clean power plan aims to double onshore wind capacity and quadruple offshore wind by 2030 C.E., while expanding solar by two and a half times.
What the numbers mean on the ground
Kayte O’Neill, Chief Operating Officer at the National Energy System Operator, described the record as proof that large-scale renewable operation is not just possible but practical. “With more and more solar and wind records being broken, you can now be more confident than ever that when you turn on the washing machine or power up your laptop, that it’s likely being powered by clean green electricity,” she said.
O’Neill added that the 98.8% figure points toward a goal that once seemed distant: “I look forward to seeing if we can break the ultimate record of running Britain’s electricity grid entirely zero carbon in the months ahead.”
Energy Minister Michael Shanks framed the milestone in terms of energy security as much as climate: every renewable record, he argued, reduces the U.K.’s exposure to fossil fuel price shocks. That argument has gained weight since the volatility of global gas markets in recent years.
Coal’s exit and the longer arc
The April records land against a remarkable historical backdrop. In 2024 C.E., Britain became one of the only countries in the world to stop using coal entirely for electricity generation — the first time coal had been absent from the grid since the 1880s. As recently as 2013 C.E., coal was responsible for 40% of the country’s electricity.
That shift required not just new infrastructure but new ways of managing grid stability without the inertia that large spinning turbines once provided. NESO has developed tools and markets for synthetic inertia and fast-response balancing to keep the grid stable as variable renewables dominate. The April 22 window demonstrates that those systems are working.
Britain is not alone. Global renewable capacity has expanded rapidly, with wind and solar now the cheapest sources of new electricity generation in most of the world. The U.K.’s grid, however, is one of the few that has managed such a high zero-carbon share across an entire national system — not just in a single region or during a brief test.
Still work to do
The 98.8% figure lasted only 30 minutes, and daily and seasonal averages remain well below that peak. Gas still plays a balancing role during low-wind, low-solar periods, and the grid’s long-term reliability will depend on expanded storage capacity — particularly long-duration storage — that remains limited. NESO’s own analysis acknowledges that reaching consistent zero-carbon operation will require significant investment in storage, interconnectors, and demand flexibility, not just more generation.
The path from a record moment to a reliable everyday reality is still being built. But the records themselves confirm the direction of travel — and the pace at which Britain is moving along it.
Read more
For more on this story, see: National Energy System Operator (NESO)
For more from Good News for Humankind, see:
- Renewables now make up at least 49% of global power capacity
- Indigenous land rights win at COP30: 160 million hectares recognized
- The Good News for Humankind archive on the United Kingdom
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