Skip to main content

Operational Data

Maintenance

Maintenance is an essential part of our role in keeping the high-pressure gas National Transmission System (NTS) safe, fit for purpose and operating efficiently and economically, in line with our obligations. 

To carry out work on the NTS, we sometimes need to implement an outage on part of the network or reduce the flexibility available (e.g. where steady flows may be required). This may affect one or more parties connected to the network, including: 

  • Gas-fired power stations and large industrial consumers
  • Gas storage facilities 
  • Gas entry facilities
  • Distribution networks. 

Types of maintenance 

Customers may be affected by:

  • routine maintenance 
  • asset replacement 
  • pipeline and defect inspections 
  • emergencies and faults  
  • work to facilitate investment in the network, which may result from a new connection or capacity requirement  

We are incentivised  on some aspects of our maintenance activities. 

Flexible approach to maintenance  

We aim to minimise the impact of our maintenance on customers by being transparent about what we do, aligning our work with their outages as appropriate, and accommodating customer needs for flexibility. 

Maintenance plans 

When working with our customers to plan our system access requirements, we consider maintenance needs, forecast supply and demand patterns, as well as outage programmes from relevant and affected industry parties.  
 
Each year, we ask customers when their own outages will take place, so we can align our maintenance works with them. If your outages move, please email us ([email protected]) as early as possible, so we can consider whether it’s possible to realign our works to minimise impacts. 

Report your outage changes 

If the dates of your planned outages change, please contact us right away so we can consider realigning our works to reduce any impacts. 

Customer recharge process

It may be possible for us to agree different maintenance approaches through a mutual contract with directly connected customers. 

Customer Recharge Process