Summary
- Ireland’s CRU proposes mandatory interruptible gas connections for new industrial customers with peak hourly demand above 50MWth.
- Seventeen planned data centres seeking gas connections could impose peak demand comparable with six 500MWe combined-cycle gas turbines.
- The consultation has closed, but the regulator said on 7 September that no final decision has been made.
Ireland’s Commission for Regulation of Utilities is considering a mandatory interruptible gas connection regime for very large industrial customers as prospective data centre demand increases pressure on the country’s gas system.
The regulator’s proposed direction would apply to new industrial customers with peak hourly demand above 50MWth, excluding gas-fired generators participating in the Single Electricity Market. Customers connected under the regime would accept the risk of curtailment when the gas system is under stress.
The CRU consultation closed on 10 August. On 7 September, the regulator said it was still considering stakeholder feedback and had not made a final decision.
Data centres sit at the centre of the proposal because of the scale of prospective demand. CRU analysis cited in Irish reporting indicates that 17 planned data centres seeking gas-grid connections could together impose peak demand equivalent to six 500MWe combined-cycle gas turbine plants, or around 2.6 million homes.
The regulator has warned that rapid growth from very large industrial connections could have a substantial effect on security of gas supply before network reinforcement becomes available. Gas Networks Ireland also has statutory duties to provide eligible customers with access to the network, limiting the option of simply refusing connections because future capacity may become constrained.
The interruptible product is intended to bridge that gap. Rather than provide all large customers with firm capacity, the network would retain the ability to reduce or stop gas supply during periods of severe system pressure.
Irish reporting indicates that an interruptible customer would receive a network-tariff discount reflecting the probability of interruption. The level of any discount has not been finalised.
For data centre developers, the proposed regime would move part of the resilience burden behind the meter. A facility relying on gas for onsite generation would need an operating plan for periods when that fuel supply is unavailable, potentially involving load reduction, alternative generation, stored fuel, or another source of electricity.
Those choices carry their own engineering and commercial consequences. Backup generation requires fuel storage, maintenance, emissions controls, and regular testing, while reducing compute load during a gas interruption may conflict with customer availability commitments.
Ireland’s data centre power regime has increasingly encouraged developers to demonstrate that new facilities can support their own energy requirements rather than relying solely on additional grid generation. Greater reliance on onsite gas, however, transfers part of the capacity problem from the electricity system to the gas network.
The CRU’s analysis assumes substantial additional data centre demand against a gas system that may face periods of scarcity during severe cold weather. Interruptibility would give the network another tool for protecting supply to customers that cannot readily switch fuels or reduce consumption.
The proposal does not alter Gas Networks Ireland’s wider programme of network expansion, nor does it remove statutory connection rights. It instead changes the quality of capacity available to the largest new industrial customers while reinforcement catches up with demand.
That distinction is likely to influence project economics. Developers assessing a gas-backed power strategy would have to account not only for the cost of the connection and fuel, but also for the probability and operational consequence of interruption.
The CRU now has to decide whether mandatory interruptibility offers sufficient protection to the gas system without making otherwise viable industrial projects unworkable. Until its final direction is published, the connection terms facing the largest prospective gas users remain unsettled.
