Behind-the-meter gas generation costs a data center about 2.2 cents per kWh in fuel and roughly 3.5 to 5 cents per kWh all-in operating cost at high utilization, using gas at $2.9 to $3.0 per MMBtu and a heat rate of about 7,400 Btu/kWh (StackedAI analysis, Energy-First BTM cost model, Jul 2026). Blended utility rates in major US data center markets run about 7.15 to 9.25 cents per kWh.
How is the behind-the-meter cost per kWh built up?
Fuel is heat rate times gas price. A heat rate of about 7,400 Btu/kWh is about 46% thermal efficiency, since 3,412 Btu of fuel energy equals one kWh. At Henry Hub or Houston Ship Channel gas of $2.9 to $3.0 per MMBtu, fuel cost is 7,400 Btu/kWh multiplied by $3.0 per million Btu, or $0.0222 per kWh: about 2.2 cents (StackedAI analysis, Energy-First BTM cost model, Jul 2026). Delivered gas costs more than the hub price once transportation is added, so the hub figure is a floor.
Operating cost adds fixed and variable operations and maintenance: OEM service agreements priced per running hour, consumables, catalyst media, staffing, insurance, and water. With those layers, StackedAI’s model lands at roughly 3.5 to 5 cents per kWh all-in operating cost at high utilization (StackedAI analysis, Energy-First BTM cost model, Jul 2026). Capital recovery is excluded and discussed below; the prime-mover choice that drives it is compared in gas turbine vs reciprocating engine for data center power.
How sensitive is the number to gas price, utilization, and heat rate?
Three inputs move the result; the gas prices and heat rates below are hypothetical inputs to the cited formula, not forecasts.
Gas price: at 7,400 Btu/kWh, each $1 per MMBtu change in delivered gas moves fuel cost by about 0.74 cents per kWh. Gas is the largest operating line item, so supply structure (firm versus interruptible transport, fixed versus index pricing, hedge tenor) is a lender’s first question.
Heat rate: it degrades at part load, in high ambient temperatures, and as units age between overhauls, so an oversized plant runs worse than its 7,400 Btu/kWh design.
Utilization: fuel scales with output, but fixed O&M and capital recovery do not. Fixed cost per kW-year divided by 8,760 hours times capacity factor gives its share per kWh, so halving capacity factor doubles it. That is why the figure is stated at high utilization, and why every M+1 spare unit adds fixed cost without output, as explained in M+1 redundancy for on-site power.
| Sensitivity | Input (hypothetical) | Fuel cost per kWh (arithmetic on cited heat rate) |
|---|---|---|
| Gas price at 7,400 Btu/kWh | $2.9–3.0/MMBtu (cited band) | ~2.15–2.2¢ (StackedAI analysis, Jul 2026) |
| Gas price at 7,400 Btu/kWh | $4.0/MMBtu | ~3.0¢ |
| Gas price at 7,400 Btu/kWh | $5.0/MMBtu | ~3.7¢ |
| Heat rate at $3.0/MMBtu | 6,500 Btu/kWh | ~1.95¢ |
| Heat rate at $3.0/MMBtu | 8,500 Btu/kWh | ~2.55¢ |
What is not in the 3.5 to 5 cents per kWh figure?
Five items sit outside the operating figure.
Capital recovery: engines or turbines, generators, switchgear, transformers, gas compression, controls, and civil works. Turbine equipment alone is heading toward about $600 per kW by the end of 2027, up 195% from 2019 (Wood Mackenzie via Bloomberg, Gas turbine prices surge, Apr 2026), and transformer prices are up 60 to 80% since January 2020 (Wood Mackenzie, Power transformer lead times, Apr 2024). Engine pricing is quoted per engagement.
Permitting and compliance: permit preparation, modeling, controls, monitoring, and annual compliance.
Land and civil: footprint, noise attenuation, gas interconnection, and site works.
Backup: a BTM plant does not eliminate the diesel emergency generation a data center still builds for loss of gas supply or the plant itself.
Utility charges: with a grid tie, standby charges, minimum-take obligations such as AEP Ohio’s 85% for 12 years, and curtailment provisions such as Texas SB6 continue to apply (StackedAI analysis, large-load tariff template review, Jul 2026).
How does BTM compare with utility rates by market?
| Market | Blended utility rate (¢/kWh) | BTM gas all-in operating (¢/kWh) |
|---|---|---|
| Northern Virginia | ~9.25 | ~3.5–5 |
| Columbus | ~8.5–9.5 | ~3.5–5 |
| Salt Lake City | ~7.77 | ~3.5–5 |
| Austin | ~7–8 | ~3.5–5 |
| Dallas-Fort Worth | ~7.15 | ~3.5–5 |
Utility rates: StackedAI analysis, Tier-2 market benchmarks, Apr 2026. BTM operating cost: StackedAI analysis, Energy-First BTM cost model, Jul 2026.
The utility rate is the fuller number: it includes generation capital, transmission, distribution, and reserve margin, while the BTM figure is operating cost only. A like-for-like comparison adds capital recovery to the BTM side and standby charges to both. Even so, at high utilization and cheap gas BTM is competitive on a levelized basis, and the comparison ignores what usually decides it: the utility rate is only available after a 4.4 year average wait for large loads (Cushman & Wakefield, Global Data Center Market Comparison, May 2026).
When does behind-the-meter power beat the grid?
BTM wins on four conditions: when the grid cannot deliver on the required date, since a site that energizes in 2027 on gas rather than 2030 on the grid earns three years of revenue no per-kWh comparison captures; when gas is cheap and firm; when utilization is high, because a plant running a few hundred hours a year is a peaker; and when minimum-take or curtailability terms make the grid non-firm.
It loses when the utility can deliver on time at a competitive rate, when gas is expensive or unhedged, when the permit path is long, or when the plant cannot be financed on terms that fit the lease: top-credit projects price at spreads in the low 200 basis points with leverage up to 85% loan-to-cost, non-credit projects 200 to 300 basis points wider at 70 to 80% (JLL, NA Data Center Report Midyear 2026, Aug 2026). How sponsors weigh that is set out in how private equity underwrites data center power risk and in the energy-first campus development pillar.
Key terms
- Heat rate: fuel energy consumed per unit of electricity produced, in Btu per kWh; 3,412 Btu/kWh would be 100% efficient.
- Capacity factor: actual output over a period divided by output at continuous rated capacity.
- Firm transportation: pipeline capacity reserved by contract that cannot be interrupted for other customers.
- Levelized cost: total lifetime cost of a generation asset, including capital, divided by lifetime output.
How StackedAI applies this
StackedAI builds a site-specific BTM cost stack for every Tier-2 target that cannot secure grid power on the required date, starting from delivered gas price, unit heat rate, and the leasing plan’s utilization curve, then adding capital recovery, permitting, and tariff charges to reach a levelized figure comparable with the local utility rate. Inputs are benchmarked per engagement, and the result is presented alongside the revenue value of earlier energization.
Frequently asked questions
What does behind-the-meter gas power cost a data center per kWh?
At $2.9 to $3.0 per MMBtu gas and a heat rate of about 7,400 Btu/kWh, fuel costs about 2.2 cents per kWh. Adding operations and maintenance, all-in operating cost at high utilization is roughly 3.5 to 5 cents per kWh (StackedAI analysis, Jul 2026). Capital recovery, permits, land, and backup are on top.
How is the 2.2 cents per kWh fuel cost calculated?
Multiply heat rate by gas price: 7,400 Btu/kWh is 0.0074 MMBtu per kWh; times $3.0 per MMBtu equals $0.0222 per kWh, or 2.2 cents. At $2.9 gas the result is about 2.15 cents. That heat rate corresponds to about 46% thermal efficiency, since 3,412 Btu equals one kWh.
How sensitive is BTM cost to the price of natural gas?
At 7,400 Btu/kWh, each $1 per MMBtu change in delivered gas moves fuel cost by about 0.74 cents per kWh. Gas at $4 gives roughly 3.0 cents of fuel; at $5, roughly 3.7 cents. Fuel is the largest operating line item, so firm transportation and a hedged supply contract matter more to lenders than any other input.
What is not included in the 3.5 to 5 cents per kWh figure?
Capital recovery on engines, turbines, switchgear, transformers, and balance of plant; air permitting and compliance; land and civil works; the diesel emergency backup that still has to be built; gas interconnection and firm transport charges; and utility standby or minimum-take charges. These are site-specific and benchmarked per engagement.
When does behind-the-meter power beat the grid?
When the grid cannot deliver on the required date, which in 2026 means an average 4.4 year wait for large loads (Cushman & Wakefield, May 2026); when gas is cheap and firm; when utilization is high; and when the tariff imposes minimum-take or curtailment terms. It loses when utilization is low or gas is expensive and interruptible.
Sources
- Cushman & Wakefield, 2026 Global Data Center Market Comparison, May 2026, https://ir.cushmanwakefield.com/news/press-release-details/2026/Dallas-Texas-Ranked-No–1-Primary-Data-Market-in-the-World-as-AI-Demand-Power-Constraints-and-Regulation-Reshape-CRE-Strategy/default.aspx
- Wood Mackenzie via Bloomberg, Gas turbine prices surge, Apr 2026, https://www.bloomberg.com/news/articles/2026-04-01/gas-turbine-prices-surge-crimping-efforts-to-power-data-centers
- Wood Mackenzie, Supply shortages and an inflexible market give rise to high power transformer lead times, Apr 2024, https://www.woodmac.com/news/opinion/supply-shortages-and-an-inflexible-market-give-rise-to-high-power-transformer-lead-times/
- JLL, North America Data Center Report Midyear 2026, Aug 2026, https://www.jll.com/en-us/insights/market-dynamics/north-america-data-centers
- StackedAI analysis, Energy-First BTM cost model, Jul 2026 (internal)
- StackedAI analysis, Tier-2 market benchmarks, Apr 2026 (internal)
- StackedAI analysis, large-load tariff template review, Jul 2026 (internal)