Gas Supply for Data Center Power Plants: Laterals, Metering and Capacity

Estimate the gas demand early

Gas demand follows from the plant’s output and heat rate. A large campus power plant can need a substantial daily volume and a high peak hourly flow, especially when several units start together. Estimate both the daily quantity and the peak hourly rate, and share them with the pipeline operator as early as possible.

Use the hottest and coldest site conditions, because output and fuel use both change with ambient temperature. Include future phases so the lateral is not undersized for the campus build-out.

The lateral from the transmission line

Most campuses are not next to a gas line. A lateral is a dedicated pipeline from a tap on a transmission pipeline to the site. Its length, diameter and route depend on demand, pressure and land access. Laterals may be built by the pipeline operator, a local distribution company or the project, depending on local rules and commercial arrangements.

Route selection needs surveys, landowner agreements, crossings of roads, rivers and other utilities, and environmental studies. These steps often take longer than construction itself.

Tap, metering and regulating station

At the connection point, a tap and valve assembly isolates the lateral from the main line. On or near the site, a metering and regulating station measures the gas for billing, reduces pressure to what the plant needs and provides filtration and overpressure protection. Many stations also include gas heating to prevent hydrates or liquids forming when pressure drops.

Decide who owns and operates each part of this chain. The ownership boundary affects maintenance, access, custody transfer and liability.

Pressure and compression

Gas turbines need fuel delivered at a minimum pressure, which varies by model. Aeroderivative units typically need higher pressure than many industrial frames. If the pipeline cannot guarantee that pressure at peak demand, the plant will need fuel gas compressors, which add cost, power use, maintenance and a further failure point.

Ask the pipeline operator for minimum guaranteed delivery pressure, not just typical pressure. The difference decides whether compression is needed.

Firm or interruptible capacity

Firm transportation capacity gives the plant priority on the pipeline. Interruptible capacity is cheaper but can be curtailed when demand on the system is high, often in the coldest weather. For a power plant whose job is to keep servers running, interruptible gas without backup fuel is a serious risk.

Where firm capacity is scarce, the project may need to fund pipeline expansion or accept a phased arrangement in which early phases use backup fuel more often.

Gas quality

Pipeline gas composition varies by source and over time. Heating value, hydrocarbon dew point, water content, sulphur and contaminants all matter to the turbine. Obtain historical gas analysis for the pipeline and share it with the turbine supplier, who will confirm whether the fuel suits the combustion system and what filtration or conditioning is required.

Plan for sampling and monitoring on site. A gas chromatograph at the metering station gives continuous data on heating value and composition.

Permits and right of way

Pipelines need permits from several authorities, covering safety, environment, land use and crossings. In some jurisdictions, the lateral will be regulated as part of the gas system, with its own approval process. Easements must be negotiated with every landowner along the route.

Start this work during site selection. Our article on choosing a site for a data center power plant explains why gas access belongs on the shortlist criteria.

Fit the gas schedule to the power schedule

Gas often arrives last. Commissioning a turbine needs fuel, so the lateral and metering station must be ready before first fire, with time for purging, testing and gas-in procedures. Put the gas path on the project critical path alongside turbine delivery and the high-voltage works. Our guide to the data center power critical path shows how these strands fit together.

Some campuses can use temporary supplies during the gap, such as trucked compressed or liquefied gas, but these need their own permits and safety studies.

Who to involve, and when

Bring the pipeline operator, the local distribution company if one is involved, the turbine supplier and the gas regulator into the conversation before the campus layout is frozen. Each has information that changes the design: available capacity, delivery pressure, metering rules and approval timelines. Appoint one person on the project team to own the gas path from first enquiry to gas-in, so that it does not fall between the civil, mechanical and commercial teams.

Backup fuel

Most on-site data center plants keep a backup fuel, usually distillate stored on site, for pipeline outages. Dual-fuel turbines can switch over automatically. Size storage for a defined outage period, and test fuel transfer regularly. Where backup fuel is not possible, battery systems and grid supply, if available, must cover a gas interruption.

Developers looking at prime power for hyperscale loads may also consider the New USP&E FX-45 45MW Modular Gas Turbine for the Hyperscale Data Center sector in the USA, with slots from 2028 to 2030; its gas supply needs are confirmed with the project during scoping.