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Accelerated Loss Of Mains Change Programme

LoM Logo CROPPEDWe, alongside other Distribution Network Operators (DNOs) and Independent Distribution Network Operators (IDNOs), are joining forces with National Grid ESO on their 'Accelerated Loss of Mains (LoM) Change Programme'. The initiative helps owners of generation assets make the necessary changes to ensure compliance with new settings introduced under the Distribution Code.


The new requirements specify that the current protection settings required for any new generation connecting to the network must now also be applied retrospectively to existing generation with loss of mains protection.

Loss of mains protection is used to prevent damage when issues occur on the electricity distribution network with old methods of protection leading to the disconnection of generation unnecessarily. The effect of this, more often than not, happens when more renewable generation is running and the costs of trying to stop any disruptions are paid for by the consumer and electricity industry. Changing loss of mains protection will therefore deliver a step change in how the electricity system can be operated allowing more low carbon power at a lower cost.

Turbines and laptop - iStock-814023320.jpgAll owners of generation installed prior to February 2018, where generation equipment is not type-tested, and that currently comply with EREC G59, now need to comply with new settings required for the interface protection. This means owners will need to make changes to their protection settings, and have until 1 September 2022 to do so. 

We recognise that generators may incur some costs as a result of having to make these necessary changes, and the industry has arranged for support and funding to be available to help. To qualify for funding support, generators  need to register their assets through the ENA's dedicated portal, this can be found on the ENA's website

The funding is limited and will be awarded based on a set of criteria which will be published on the Energy Network Association’s websiteOne of the criteria relates to how soon generators can make the changes, so there is a benefit in applying early.

ALoMCP - Coronavirus Pandemic Response

COVID-19, the Coronavirus pandemic, and the measures taken by government and industry may impact the Accelerated Loss of Mains Change Programme. We’re working with our partners, National Grid ESO, Distribution Network Operators, and Independent Distribution Network Operators, to ensure no one loses their opportunity to receive funding for works completed.

In view of the on on-going situation all latest valid LOM change dates issued in Window 1 and Window 2 will all be extended by three months. 

Applications in Window 3 should take into account the current uncertainties and propose dates appropriately.  Owners and contractors with multiple sites where delays in Window 1 and Window 2 sites will have a knock-on effect on Window 3 sites should take this into consideration when stating the lead times for completion.

Ours, and the other Distribution Network Operators and Independent Distribution Network Operators, ability to witness test or complete sample site visits may be affected and therefore the ALoMCP requirements concerning witnessing and sampling is under review and a further update will be provided soon.

If you have any concerns please email us at G59protectionsettings@northern.com.

ALoMCP Recognised Contractor Status

We've recently produced a set of requirements relating to our ALoMCP Recognised Contractor accreditation.  Achieving ALoMCP Recognised Contractor status would negate the requirement for our teams to carry out witness testing at sites where relay replacement work or deactivation of the loss of mains protection function within a relay is to be undertaken under the ALoMCP.

For further details please contact us at G59protectionsettings@Northernpowergrid.com.


  • Further information

    Energy Networks Association logoFor further information, please visit the Energy Network Association’s website.