Free-use gas clauses and wellsite generator fuel royalty in Texas
Standard oil and gas leases let the operator use gas produced from the lease free of royalty for operations on the leased premises. When gas from the separator is routed into a generator engine instead of a pipeline, whether royalty is owed, and how that royalty is valued, depends on whether the electricity runs the lease's own wells or a commercial compute or power load.
This page is general landman reference material. Every royalty calculation turns on the specific oil and gas lease and any division orders in effect. It is not legal advice.
Most Texas oil and gas leases contain two provisions that govern gas burned at the wellsite: the gas royalty clause (which typically sets royalty on "market value at the well" for gas used off the premises or in the manufacture of products, and on "proceeds" or "amount realized" for gas sold at the well) and the free-use clause (which grants the lessee free use of oil, gas, and water from the land "for all operations hereunder"). Under Texas Supreme Court precedent (ConocoPhillips Co. v. Koopmann, 547 S.W.3d 858; BlueStone Natural Resources II, LLC v. Randle, 620 S.W.3d 380), the wording of the free-use clause controls how far royalty-free fuel extends. Gas burned in a wellsite generator to power the lease's own submersible pumps (ESPs), rod pumps, or lease compressors directly serves lease operations. Gas sold across a meter, or burned by the operator or an affiliate to run data-center servers or export power off the lease, is not an operation to produce oil and gas from the lease, and royalty owners will look to the gas royalty clause for payment on the metered volume and heating value.
1What standard Texas free-use clauses actually say
A typical Producer's 88 free-use clause states: "Lessee shall have free use of oil, gas, coal and water from said land, except water from Lessor's wells, for all operations hereunder, and the royalty on oil, gas and coal shall be computed after deducting any so used."
When a landman reviews the lease chain before a gas-to-power project starts, three variations in the recorded lease language matter immediately:
- "Operations hereunder" (on the leased premises or pooled unit): Covers heater-treaters, dehydrators, lease gas lift, and electric generation used to run pumping units or ESPs on that lease or properly pooled unit. It does not cover commercial computing, cryptocurrency mining, or third-party industrial loads located on the pad.
- Custom landowner addenda deleting or narrowing free use: Many modern Texas ranch leases delete the free-use clause entirely or restrict royalty-free fuel to a fixed percentage of gross wellhead volume (for example, no more than 3% or 5% of monthly production).
- Off-lease central tank batteries and microgrids: Under BlueStone v. Randle, a clause granting free use "for operations hereunder" does not automatically permit royalty-free use of gas off the leased premises unless the lease or pooling agreement expressly authorizes off-lease fuel use.
2Proceeds vs. market value at the well on genset fuel
When gas is used or sold to run a compute or power load that falls outside the free-use clause, the gas royalty clause sets the valuation basis. Texas gas royalty clauses usually split along two prongs:
| Transaction structure | Typical lease prong | What royalty is figured on |
|---|---|---|
| Arm's-length gas sale at the wellhead custody meter | "Sold at the well" (proceeds / amount realized) | The contract price per MMBtu or Mcf actually received from the unaffiliated power or compute buyer at the wellsite meter, subject to any minimum-price or index floor in the lease addendum. |
| Operator-owned or affiliate-owned compute skid, or gas "used off the premises" | "Used off the premises" or affiliate sale (market value at the well) | Market value at the well (or a specified hub index formula in modern landowner leases), rather than an internal transfer price between the operator and its own power subsidiary. |
3Metering split loads: lease ESPs plus compute containers
On some pads, a single generator skid powers both the operator's electric submersible pump (ESP) on the well and a modular compute container that absorbs the surplus kilowatts. If the lease allows royalty-free fuel for the ESP load but requires royalty on gas used for the compute load, accurate accounting requires:
- A calibrated custody fuel meter (`FQ-300`) with periodic gas chromatograph or lab BTU sampling ahead of the generator header.
- Revenue-grade kilowatt-hour sub-meters on the breaker feeding the lease ESP and the breaker feeding the compute container so fuel MMBtus can be allocated proportionally between lease operations (RRC Form PR disposition code 1, lease use) and gas sold or used for commercial power.
4Natural gas liquids (NGLs) knocked out ahead of the engine
Rich Permian or Eagle Ford casinghead gas (often 1,250 to 1,450+ BTU/scf) usually passes through a Joule-Thomson (JT) skid or mechanical refrigeration unit ahead of the engine so heavy hydrocarbons do not cause detonation. That conditioning skid produces two streams: leaner residue fuel gas to the engine and liquid hydrocarbons (y-grade NGLs or stabilized condensate) into a bullet tank. The gas purchase agreement and the operator's revenue accounting must state who owns the liquids, who trucks and markets them, and how royalty owners are paid on the liquid barrels or gallons recovered at the skid.
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