Constellation Energy Corporation

Most of this capacity came with the Calpine acquisition, which closed in January 2026, on top of Constellation's own gas plants. Gas plants can start and stop quickly, so they balance the grid when demand swings — but they burn fuel and emit carbon, unlike the nuclear fleet. This is now the largest part of the fleet by capacity, though not by the electricity actually generated.这部分产能大多随2026年1月完成的 Calpine 收购而来，此外还有 Constellation 自有的天然气电厂。天然气电厂可以快速启停，因此能在需求波动时平衡电网——但它燃烧燃料、排放碳，这一点与核电机组不同。如今按装机容量算，它是整个机组群中最大的一块，但按实际发电量算并非如此。

Constellation owns and runs the largest nuclear fleet in the United States, about 21 GW. Because the reactors run at close to full output nearly all the time (a ~95% capacity factor), they supply roughly 68% of Constellation's actual electricity — far more than their 38% share of capacity. This clean, always-on power is what technology companies pay to lock up for their data centres.Constellation 拥有并运营美国最大的核电机组群，约21吉瓦。由于反应堆几乎全天候满负荷运行（容量因子约95%），它们贡献了 Constellation 约68%的实际发电量——远高于其38%的装机容量占比。这种清洁、随时可用的电力，正是科技公司出钱为其数据中心长期锁定的东西。

• Microsoft contractMicrosoft 合同 — A 20-year deal to restart the Three Mile Island Unit 1 reactor (835 MW) as the Crane Clean Energy Center, targeted for 2027-2028.一份为期 20 年的协议，将重启三里岛 1 号反应堆（835 兆瓦），改名为 Crane 清洁能源中心，计划在 2027-2028 年投运。
• Meta contractMeta 合同 — A 20-year deal for 1,121 MW from the Clinton plant in Illinois, from 2027.一份为期 20 年的协议，从 2027 年起从伊利诺伊州的 Clinton 电厂购买 1,121 兆瓦电力。

Constellation runs wind farms across many states, plus solar and battery-storage sites added through Calpine. Small today next to nuclear and gas, but it rounds out the clean-energy side of the fleet.Constellation 在多个州运营风电场，并通过 Calpine 新增了太阳能和电池储能项目。目前相对核能和天然气规模较小，但它补齐了机组群中清洁能源的一侧。

Two large hydroelectric plants supply more than 1.6 GW between them — long-lived, low-cost, carbon-free capacity.两座大型水电站合计供应超过1.6吉瓦——长寿命、低成本、无碳的产能。

Through Calpine, Constellation now owns The Geysers in California, the largest geothermal complex in the world, at about 725 MW.通过 Calpine，Constellation 现在拥有加州的 The Geysers 地热田，这是全球最大的地热发电群，容量约725兆瓦。