Registry, engineering, and operating metrics shown on a consistent EIA basis.
| Metric | Hawthorn Jackson County | GREC Mayes County |
|---|---|---|
| Capacity | 1,046.2 MW | 1,194.3 MW |
| Technology | Natural Gas Fired Combustion Turbine, Natural Gas Fired Combined Cycle, Conventional Steam Coal | Natural Gas Fired Combined Cycle, Conventional Steam Coal |
| Operator | Evergy Metro | Grand River Dam Authority |
| Operating units | 5 | 4 |
| Latest 12-month generation | 2.78 TWh | 3.23 TWh |
| Latest complete-year capacity factor | 32.9% (2025) | 38.2% (2025) |
| National technology rank | #117 of 206 | #247 of 538 |
| Latest EIA report | 2026-04 | 2026-04 |
Generation comes from EIA-923. Capacity, unit counts, technology, and reporting relationships come from EIA-860. Incomplete reporting years are excluded from capacity-factor comparisons.