Global Energy Shift: Solar Overtakes Nuclear for the First Time

According to the World Nuclear Industry Status Report (WNISR) 2026, a historic pivot in global energy production has occurred. For the first time, solar power generation has surpassed that of nuclear power on a global scale.

The report, led by French energy consultant Mycle Schneider, paints a stark contrast between the stagnant growth of the nuclear sector—plagued by long construction times and a lack of Small Modular Reactor (SMR) deployment—and the explosive rise of renewables and energy storage.

The Timeline of Transition

The shift didn't happen overnight, but the momentum accelerated rapidly between 2025 and 2026.

Capacity Growth Comparison (2025)

The gap between traditional nuclear power and renewable energy widened significantly last year. The following table outlines the growth:

Note: Nuclear capacity has remained virtually flat for over a quarter-century.

A Note on Data Discrepancies

It is important to highlight that the WNISR figures are considered conservative. Data from the IEA PVPS suggests that solar additions in 2025 were actually closer to $\approx 690\text{ GW}$.

This implies a difference of: $\Delta = 690\text{ GW} - 510\text{ GW} = 180\text{ GW}$ This suggests the actual lead solar holds over nuclear is even more pronounced than the report indicates.

Industry Realities and Financial Struggles

Mycle Schneider provided a sobering perspective on the state of the nuclear industry:

“The reality of the nuclear industry on the ground is quite sobering for those who expected to find a booming sector.”

The financial markets have reflected this skepticism:

• Holtec: Put its IPO on hold just days before listing, missing a chance to raise nearly $1 billion.
• Fermi: Has seen its stock value plummet by approximately $80\%$ since its October 2025 debut.

Schneider attributes this to a lack of tangible progress: "These companies have little or nothing to show on the ground to convince investors to continue providing cash."

The Role of Energy Storage

The continued ascent of solar is heavily supported by the plummeting cost of batteries, which help manage the variability of renewable energy and mitigate the impact of negative electricity prices.

BESS (Battery Energy Storage System) Milestones in 2025:

• New Connections: 104 GW and 257 GWh.
• Concentrated Growth: Over $78\%$ of all cumulative BESS capacity was installed in the short window between 2023 and 2025.

Nuclear's Slow Decline

While nuclear power is not disappearing, its influence is waning. Most new activity is now concentrated exclusively in China and Russia.

Current Status (as of July 1, 2026):

• Operating Reactors: 411 units across 31 countries.
• Operating Capacity: $374.7\text{ GW}$ (excluding 30 units in long-term outage).
• Global Generation Share: Slipped to $8.8\%$, reaching its lowest point.

Generation Trends

In 2025, nuclear plants produced $2,703\text{ TWh}$ (a $1.1\%$ increase). However, this was almost entirely due to a $7.6\%$ jump in China. Outside of China, nuclear generation actually fell by $0.2\%$, remaining below 2006 levels.

{
  "annual_growth_comparison": {
    "nuclear_generation": "+1.1%",
    "solar_generation": "+30.0%",
    "verdict": "Growth rates are the deciding factor"
  }
}

Reported by Emiliano Bellini