China Aims for World's Largest Nuclear Fleet by 2035 as Reactor Output Stumbles

China Aims for World's Largest Nuclear Fleet by 2035 as Reactor Output Stumbles Extended refuelling outages cut nuclear generation in April, forcing China back onto coal even as Beijing targets doubling reactors' share of power to 10% by 2035. China leaned harder on coal in April (2026-04), boosting coal and gas power generation by 3.1% year-on-year as nuclear and wind output fell, according to oilprice.com. Some reactors were offline for maintenance, and weak wind speeds left thermal plants to cover the gap.⁷ That matters because nuclear is supposed to be the steady, weather-proof leg of China's grid, and its stumble exposes how much coal still does the heavy lifting when low-carbon supply wobbles. The Centre for Research on Energy and Clean Air estimated total power generation rose 6.6% year-on-year, but extended nuclear refuelling outages, subdued solar and weak wind pushed coal power up for a fourth consecutive month.¹ Beijing's ambition for the sector is large. By 2035 China aims to have the largest nuclear sector in the world, producing 10% of its electricity, twice the share it generates today (2026-05-19), according to The Economist.³ The gap between that target and current performance is the story. A fleet meant to anchor baseload power instead became a swing factor in April, refuelling cycles pulling capacity offline at the same time renewables underdelivered.^1,7 Coal answered. Thermal power commissioning in the first quarter surged more than 160% year-on-year to a record high, CREA data show, the legacy of a building spree that began when power cuts across 20 provinces in 2021 and 2022 spooked party leaders. Construction started on nearly 100GW of coal generation in 2024.^1,3 Yet the longer arc still bends away from coal. Carbon Brief found China's coal-power generation fell in 2025 after the country added record clean energy. Separate Carbon Brief analysis showed clean power growth pushing China's CO2 emissions down 1% year-on-year in one quarter despite rising demand.^5,6 So April looks less like a reversal than a reminder. When nuclear, wind and solar all sag in the same month, the system leans on the plants it has spent years building as insurance. Solar capacity additions fell 31% year-on-year off a high base, while wind additions rose just 8%, according to CREA.¹ China is trying to smooth those swings with storage. A third of the world's pumped-storage under development sits in China, which looks set to break its own 130GW target for 2030, The Economist reported. More storage would let an expanded nuclear fleet run flat out while reservoirs absorb the renewable volatility that caught the grid out in April.³ The supply side stays comfortable. China's coal production slipped 1% in April (2026-04) to 385.63 million tons, Reuters reported, down from a record in March, while coal imports fell 6% year-on-year in March (2026-03) to a historic low as domestic output surged and prices hit four-year lows. Analysts attribute the import drop to weak demand, high port inventories, narrowing margins and a strategic pivot toward self-sufficiency, according to newstarget.com.^2,4 That self-sufficiency push is the quiet subplot. A widening price gap between cheap domestic coal and imported tonnes has incentivised Chinese buyers to lean on local mines, newstarget.com reported, which keeps coal cheap and available precisely when nuclear and renewables fall short.⁴ Watch the refuelling calendar and the next monthly generation print. If nuclear output recovers as units return and coal power stops climbing, April was a maintenance blip. If thermal commissioning keeps running at record pace while reactors stay slow to restart, the 2035 nuclear target starts to look like ambition racing ahead of delivery.^1,3