Accelerated Loss of Mains Change Programme



ALoMCP - Coronavirus Pandemic Response – Update 16 April 2020

The ALoMCP Steering Group has reviewed the latest government[1] and industry[2] guidance concerning the coronavirus pandemic.  The Programme is considered necessary for the short to medium term security of supply and ensuring network resilience. Therefore, programme delivery continues, with the following additional guidance:

  • Applicants who have accepted the terms and conditions of the Programme and have a Latest Valid LoM Change Date before or within September 2020, but have yet to complete the required works, will have their deadline extended by 3 months. It will not be necessary to make any change to your Proposed Change Date on the Programme portal at this time.
  • DNO/IDNO requirements to witness certain works and complete Sample Site Visits are unchanged. Where DNO/IDNOs are unable to attend sites in person they have agreed to support trials to complete witness testing and Sample Site Visits virtually, for example by means of video calling.  Contractors should engage with the relevant DNO/IDNO for details of how to accomplish this.
  • Payments due to applicants who have already completed their work, and had a Sample Site Visit conducted where applicable, will be processed as soon as is practicable under current working arrangements.
  • The Programme portal remains open for applications and the current application window will close as planned on the 12th of May. We ask that the lead time provided in new applications accommodates any estimated delay due to Covid-19 conditions and that the lead time of any existing application made in Window 3 is amended appropriately, if necessary and in liaison with the DNO/IDNO. Window 4 is scheduled to open 13 May and we will provide an update by the end of April.

During these extraordinary COVID-19 conditions we understand that you may be unwilling or unable to progress your ALoMCP works within the allotted timeframe.  It is our intention that the 3-month extension given should mean that no applicant is penalised if they are unable to work within the government guidance or decides that the risk to them of undertaking works is too great, with a further commitment from us to review that extension again as the situation evolves.

The ALoMCP will keep the situation under review and update this response as the situation changes and as information becomes available.

Further information

The purpose of the ALoMCP is to improve resilience of the national electricity network in order to maintain security of supply across the country. In an open letter to Network Operators, Ofgem have categorised what activities are to be considered High Priority and Lower Priority Works and Services to enable Network Companies to prioritise works. As the protection modifications proposed under the ALoMCP can be considered “Planned Works necessary for the short to medium term security of supply and ensuring network resilience” they can be considered High Priority. Therefore, further to the recent decision to suspend delivery of the programme, and after careful consideration of the current government guidance, the ALoMCP workgroup recognises that it is possible to continue with the programme whilst remaining compliant with these guidelines.



Where reference is made to government guidance we take this to be the guidance published at; .

The Ofgem open letter to Network Companies is published at;

Open Letter to Inverter Manufacturers

Please see an open letter from the Programme to inverter manufacturers here.

National Grid ESO Report update on the ALoMCP can be found here.

Accelerated Loss of Mains Change Programme (ALoMCP)

Note: this Programme does not apply to domestic and similar generation that has been connected in accordance with EREC G83.  It only applies to generation connected before 01 February 2018 in accordance with EREC G59.

This is an industry led project delivered by National Grid ESO, Distribution Network Operators, and Independent Distribution Network Operators to accelerate compliance with new requirements in the Distribution Code. National Grid ESO and GB Distribution Network Operators (DNOs) / Independent Distribution Network Operators (IDNO) are undertaking this electricity transmission and distribution industry led initiative managed on behalf of the Distribution Code Review Panel.

The participating DNOs and IDNOs are listed below, along with the primary email to contact regarding any technical questions on the ALoMCP:

Registered DNO

Initial Email address

Electricity North West Ltd

[email protected]

Northern Powergrid

[email protected]

Scottish & Southern Electricity Networks

[email protected]

SP Energy Networks

[email protected]


UK Power Networks

[email protected]

Western Power Distribution

[email protected]

Registered IDNO

Initial Email address

Eclipse Power Networks Limited

[email protected]

Energetics Electricity Limited

[email protected]

Energy Assets Networks Limited

[email protected]

ESP Electricity Limited

[email protected]

Fulcrum Electricity Assets Limited

[email protected]


G59protecti[email protected] 

Harlaxton Energy Networks Limited

[email protected]

Independent Power Networks Limited

[email protected] 

Leep Electricity Networks Limited

[email protected]

Murphy Power Distribution Limited

[email protected]

The Electricity Network Company Limited

[email protected] 

UK Power Distribution Limited

[email protected]

Utility Assets Limited

[email protected]

Vattenfall Networks Limited

[email protected]

The remaining IDNOs have been engaged in the programme and are expected to join the scheme in the very near future.  Generators connected to any IDNO should register and will be dealt with in the normal manner.

Contact details of all DNO’s and IDNO’s can be found here.

The purpose of the initiative is to consider Loss of Main (LoM) protection and their settings. The aim being to reduce the risk of inadvertent tripping and reduce system balancing issues by giving National Grid ESO greater latitude with regards to system RoCoF limits.

It is a requirement of the Distribution Code that all owners of generation installed prior to February 2018, and where the generation equipment is not type-tested, to comply with new setting requirements for the interface protection in accordance with EREC G59. Owners of generation have to comply with the Distribution Code and have until 31 August 2022 to comply with these modified interface protection requirements.  After that date owners who have not made the change may be the subject of an enforcement programme.

Guidance and information regarding the programme including timescales can be found on the registration portal,whilst details of the contract terms and conditions can be found here.

To help owners of generation make the necessary changes, through ENA, National Grid Electricity System Operator (NGESO), the Distribution Network Operators (DNO) and Independent Distribution Network Operators (IDNO), have set up a Portal to allow generators to register their intention to make settings changes and to facilitate the development of a prioritised delivery programme.

The link to the Portal is

How the data you provide is used, stored and processed by National Grid ESO and DNO/IDNO companies can be found on the project Privacy Statement linked to from the Portal

Generators who make the settings changes will be paid by the DNO / IDNO they are connected to according to the degree of work involved in making the changes.

Details of the payment and the selection process can be found here.


  • It is intended that generators will undertake the settings changes themselves through their own contractors or site management teams.
  • To assist generators, the ENA has a directory of contractors who claim they have the capabilities to undertake this work.
  • A generator is entitled to use any competent contractor to make the changes to their assets. Contractors listed on the directory of contractors are self-declared but are not officially registered or formally approved by DNOs or ENA.
  • A contractor does not have to appear on the directory of contractors in order to participate in the programme providing they can prove their competency to undertake the changes to the satisfaction of the generator.
  • The ENA’s directory of contractors can be found here.
  • For general FAQs click here; for technical FAQs, click here.
  • Further information regarding issues raised by other stakeholders involved in the LoM project can be found here.

Project Governance  

Stakeholder Information

Further stakeholder information can be found here and in the links to documents below. This will be developed as the programme progresses.

  • Slides from stakeholder events held in London and Glasgow in April 2019 detailing the purpose and programme can be found here.

Contact us

If you have any questions regarding the request for feedback on the ALoMCP please do not hesitate to contact us at the email address below

  • [email protected]
  • Links to National Grid and DNO/IDNO email boxes concerned with the assessment and delivery of the programme can be found here. Please check who your DNO/IDNO is here before contacting these addresses.

The documents and information on this webpage will be updated as necessary and as the ALoMCP progresses.