Lange Gas Turbines
Pennington County, South Dakota · EIA plant ID 55478 · Operator: Black Hills Power, Inc. d/b/a
100 MW under construction (Natural Gas Internal Combustion Engine), first expected Dec 2026 · EIA-860M
Nameplate40MWSummer 34 MW
Generators1in service · 100 MW building
Net generation144GWh12 mo to Dec 2025
Capacity factor49%gas/coal/oil units, summer MW
Heat rate10,946Btu/kWhfossil units, electric fuel, HHV
First online2002Runs as intermediate
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2003 | 67.8 | 22.8% | 9,747 |
| 2004 | 16.4 | 5.5% | 14,907 |
| 2005 | 17.1 | 5.7% | 11,186 |
| 2006 | 23.8 | 8.0% | 10,473 |
| 2007 | 32.1 | 10.8% | 10,539 |
| 2008 | 24.8 | 8.3% | 10,678 |
| 2009 | 14.6 | 4.9% | 10,894 |
| 2010 | 4.7 | 1.6% | 12,916 |
| 2011 | 3.9 | 1.3% | 11,969 |
| 2012 | 12.9 | 4.3% | 11,554 |
| 2013 | 8.4 | 2.8% | 9,597 |
| 2014 | 2.9 | 1.0% | 14,245 |
| 2015 | 10.9 | 3.6% | 12,608 |
| 2016 | 11.7 | 3.9% | 12,344 |
| 2017 | 8.9 | 3.0% | 11,812 |
| 2018 | 9.3 | 3.1% | 11,929 |
| 2019 | 22.3 | 7.5% | 11,327 |
| 2020 | 35.2 | 11.8% | 11,386 |
| 2021 | 42.8 | 14.4% | 10,742 |
| 2022 | 27.7 | 9.3% | 11,300 |
| 2023 | 38.2 | 12.8% | 11,636 |
| 2024 | 115.4 | 38.6% | 11,254 |
| 2025 | 144.5 | 48.5% | 10,946 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 1 | Natural Gas Fired Combustion Turbine | GT | 40 | 34 | Mar 2002 | Operating | — | coming soon |
| IC01 | Natural Gas Internal Combustion Engine | IC | 16.6 | 16.3 | planned Dec 2026 | Under construction | — | coming soon |
| IC02 | Natural Gas Internal Combustion Engine | IC | 16.6 | 16.3 | planned Dec 2026 | Under construction | — | coming soon |
| IC03 | Natural Gas Internal Combustion Engine | IC | 16.6 | 16.3 | planned Dec 2026 | Under construction | — | coming soon |
| IC04 | Natural Gas Internal Combustion Engine | IC | 16.6 | 16.3 | planned Dec 2026 | Under construction | — | coming soon |
| IC05 | Natural Gas Internal Combustion Engine | IC | 16.6 | 16.3 | planned Dec 2026 | Under construction | — | coming soon |
| IC06 | Natural Gas Internal Combustion Engine | IC | 16.6 | 16.3 | planned Dec 2026 | Under construction | — | coming soon |
Owner / operator
Operator: Black Hills Power, Inc. d/b/a. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Black Hills Power, Inc. d/b/a | 100.0% | 40 MW |
Nearby plants
Within 80 km.
| Ben French | 110 MW | 1.4 km |
| Wild Springs | 128 MW | 33.7 km |
| Spearfish Hydro | 4 MW | 63.3 km |