A review of shrinkage volumes on the National Transmission System (NTS)

Call for input description

Shrinkage describes gas that is consumed, lost or unaccounted for on the National Transmission System (NTS).

We are launching a review of NTS Shrinkage with the intention to consider options to reduce gas volumes that are lost on the network. By improving the efficiency of the system more gas can be used productively and efficiently, reducing waste, cost and the environmental impact of emissions. We are aware of stakeholders’ concerns on the volumes of NTS Shrinkage in recent years.

We are seeking insights and evidence on the causes behind NTS Shrinkage. The call for input will cover fugitive emissions, metering and the minimisation of metering errors, gas quality issues and its impact on Calorific Value Shrinkage (CVS). It will also cover the roles and responsibilities of important industry participants.

Who should respond 

We are keen to hear from all stakeholders on the matters concerned and the questions raised in the call for input. We are particularly keen to hear from: 

• National Gas 
• gas distribution networks (GDNs) 
• gas shippers 
• large offtakers on the NTS 
• meter owners and operators 
• consumer and environmental representatives 

How to respond

Submit your response by 7 January 2026 by emailing gas.systems@ofgem.gov.uk