EnergyData brief
Google's data centers used 42.4 TWh in 2025, 2.9x their 2020 level
Six years of Google's own reported data-center electricity, showing why a 20-year nuclear deal is part of the plan.
Tec N Trend data desk · 1 min read · 3 open sources
- Data-center electricity, 2025
- 42.4 TWh
- Change vs 2024
- +38%
- Multiple of 2020
- 2.9x
- Constellation nuclear upgrades (Verge)
- 890 MW over 5 years
Google signed a 20-year agreement with Constellation to pay for upgrades at nuclear plants in Illinois, Pennsylvania and New Jersey. The Verge reports it should add about 890 megawatts over five years across 11 reactors, and sits alongside a separate 15-year, 2,700 MW supply deal.
Google's environmental reports show the demand behind it. Data centers used 42.4 TWh in 2025 per the 2026 report, up 38% from 30.6 TWh in 2024 and 2.9 times the 14.4 TWh the 2025 report gives for 2020. The 2025 increase alone, 11.8 TWh, equals 82% of everything the data centers used in 2020.
By our arithmetic, 890 MW running every hour would yield about 7.8 TWh a year, less than 2025's 11.8 TWh increase. Watch whether the upgrades arrive on schedule, and whether the 2025 figure is revised later, as earlier years were.
Data, method and caveats
- Google 2026 Environmental Report, data centers electricity table (2021-2025), PDF p.93 published report (figures cited) · captured 2026-10-07
- Google 2025 Environmental Report, data centers electricity table (2020-2024), PDF p.107 published report (figures cited) · captured 2026-10-07
- The Verge, Google and Constellation nuclear deal news report (facts only) · captured 2026-10-07
- Each bar uses the latest report that carries the year: 2021-2025 from the 2026 report, 2020 from the 2025 report (the 2026 report starts at 2021). Google recalculates history; for 2021-2024 the 2025 report gave 17.7, 20.8, 24.3 and 30.8 TWh, 0.2 to 0.3 TWh higher.
- The 2020 to 2024 report editions were searched for a data-center-only row; their tables show total electricity (data centers plus offices), so 2019 and earlier are not charted. The 2024 report's text says "more than 24 TWh" for 2023, consistent with 24.0-24.3.
- Figures are electricity consumption, not generation or emissions, and count Google-operated data centers only (offices excluded; offices added 1.2 TWh in 2025).
- The Verge article was read for the deal terms; its 37% electricity-growth figure is for total company electricity (Google's report: 31.7 to 43.6 TWh), while the 38% here is data centers alone.
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