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  • Maintenance

  • Maintenance is an essential undertaking as part of our role to keep the high pressure gas National Transmission System (NTS) safe, fit for purpose and operating in an efficient and economic manner, in line with our various obligations.

    In order to facilitate work on the NTS, it is sometimes necessary to take an outage of a part of the network or reduce the flexibility available (e.g. where steady flows may be required). This may affect one of more parties connected to the network including:

    • Gas fired power stations and large industrial consumers connected to the NTS;
    • Gas Storage Facilities;
    • Gas Entry Facilities; and
    • Distribution Networks.
     

    We are also incentivised on some aspects of our maintenance activities.

  • Types of Maintenance

  • Primarily the work that affects our customers is as a result of routine maintenance, asset replacement, pipeline and defect inspections, emergencies and faults and work to facilitate investment in the network which may be as a result of a new connection or capacity requirement (common maintenance types).

  • Facilitating Flexibility

  • We aim to minimise the impact of our maintenance on customers through transparency, aligning our work with their outages as appropriate and facilitating customer needs for flexibility.

    Each year we ask when our customers' outages are to enable alignment of works. If your outages move, please get in touch as early as possible so that we can consider whether we can also realign our works to reduce any impact of these works.

    Contact us

    If you would like to talk to us regarding alignment of works please contact us at

     ntsaccessplanning@nationalgrid.com   

    Sometimes standard maintenance approaches may not be optimal for our customers. Where this is the case the Minor Works Agreement can enable parties to agree different maintenance approaches through a bilateral contract with directly connected customers. Customers can pay the incremental costs of working flexibly outside normal working practices where we are able to accommodate these requests. For example:

    • Customer-initiated requests for us to change our planned maintenance to a non-standard arrangement; such as requesting planned maintenance during non-standard hours (e.g. weekend or bank holiday).
    • Customer-initiated requests for NGG work including the isolation of their supply to facilitate the customer's works.
     

    If you would like more information, please get in touch or have a look at our standard Minor Works Agreement and Minor Work Request template

     
     Contact us

     If you would like to talk to us about potential options, please contact us at;

    box.SCM.GTO@nationalgrid.com

      

  • Maintenance Plans

  • In working with our customers to plan our system access requirements, we consider maintenance requirements, forecast supply and demand patterns as well as outage programmes from relevant and impacted industry parties to facilitate alignment of work where feasible to reduce its impact.

  • 31 Aug 2017
    Winter 2017 Maintenance Programme Draft
    184 KB

    10 Jul 2017
    Deliverablity with Respect to Planned Maintenance 01 October 2016 - 31 December 2017 (June 2017 Update)
    7 KB

    31 May 2017
    Maintenance Programme 2016-17 Review
    299 KB

    12 Apr 2017
    Deliverablity with Respect to Planned Maintenance 01 October 2016 - 31 December 2017 (March 2017 Update)
    7 KB

    31 Mar 2017
    Summer 2017 Maintenance Programme Final Version
    351 KB

    31 Jan 2017
    Summer 2017 Maintenance Programme DRAFTv1
    281 KB

    06 Jan 2017
    Deliverability with Respect to Planned Maintenance 01 October 2016 - 31 December 2017 (December 2016 Update)
    7 KB

    14 Nov 2016
    EU Harmonisation of Maintenance 2017 Interconnector Capacity Summary Tables - 14th November 2016
    99 KB

    14 Nov 2016
    EU Harmonisation Cover Note
    149 KB

    10 Oct 2016
    Deliverability with Respect to Planned Maintenance 01 October 2016 - 31 December 2017 (September 2016 Update)
    7 KB

    30 Sep 2016
    Winter 2016 Maintenance Programme Final v1
    183 KB

    31 Aug 2016
    Winter 2016 Maintenance Programme Draft v2
    189 KB

    12 Jul 2016
    Deliverability with Respect to Planned Maintenance 01 October 2015 - 31 December 2016 (July 2016 Update)
    7 KB

    03 Jun 2016
    Maintenance Programme 2015-16 Review v2
    306 KB

    11 Apr 2016
    Deliverability with Respect to Planned Maintenance 01 October 2015 - 31 December 2016 (March 2016 Update)
    13 KB

    31 Mar 2016
    Summer 2016 Maintenance Programme FINAL v1
    301 KB

    29 Jan 2016
    Summer Maintenance Programme 2016 v1
    256 KB

    05 Jan 2016
    Deliverability with Respect to Planned Maintenance 01 October 2015 - 30 December 2016 (December 2015 Update)
    55 KB

    13 Nov 2015
    EU Harmonisation of Maintenance Publications at Interconnection Points 2015-16
    110 KB

    13 Nov 2015
    EU Harmonisation 2015-16 Cover Note
    16 KB

    06 Oct 2015
    Deliverability with Respect to Planned Maintenance 01 October 2015 - 30 December 2016 (September 2015 Update)
    55 KB

    30 Sep 2015
    Winter 2015 Maintenance Programme Final v1
    233 KB

    28 Aug 2015
    Winter 2015 Maintenance Programme Draft v1
    227 KB

    06 Oct 2015
    Deliverability with Respect to Planned Maintenance 01 October 2014 - 30 December 2015 (June 2015 Update)
    55 KB

    29 May 2015
    Maintenance Programme Review - 2014
    273 KB

    17 Apr 2015
    Deliverability with respect to Planned Maintenance October 2014 – December 2015 (March Update)
    45 KB

    31 Mar 2015
    Summer 2015 Maintenance Programme Final v1
    634 KB

    30 Jan 2015
    Draft April Maintenance Programme 2015 v1-1
    608 KB

    15 Jan 2015
    Deliverability with respect to Planned Maintenance 01 October 2014 – 31 March 2015 (December update)
    23 KB

    14 Nov 2014
    EU Harmonisation 2014-15 Cover Note
    23 KB