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What is Loss of Mains
Scottish and Southern Electricity Networks is working with National Grid ESO, the other Distribution Network Operators and Independent Distribution Network Operators, to make sure all generators connected to our network are aware of new requirements and are able to apply for funding to make the necessary changes before the requirement come into force. This is called the Accelerated Loss of Mains Change Programme (ALoMCP) and our aim is to help generators understand the changes they must make to their equipment, to ensure safe balancing of the grid and security of supplies.
By taking action, generators will be reducing the risk of their generation tripping out unnecessarily. That will contribute to making this country’s secure, reliable power supply even more resilient.
Generators are able to apply for funding if the following all apply to their installation:
The following table outlines the opening and closing dates related to payment process specifications.
You can hear more information here, that we communicated at our most recent webinar in September 2021.
What support is there?
There is funding available to support making these changes.
But if the installation qualifies under the points above and the generator does
not make the changes by September 2022, they will be considered non-compliant
with the Distribution Code and may face enforcement action. Details of the
funding available can be found in the Payment
What do I do now?
Visit the portal to
learn more and/or make a funding application
Go straight to the Loss of Mains Portal to register your intention to
make settings changes, here.
As the flow-chart linked
above shows, check your settings and apply or confirm compliance with your DNO
A Recognised Contractor is able to "self-certify" (supported by evidence) works undertaken in the SSEN network area as part of the ALoMCP, without the requirement of witness testing attendance by an SSEN engineer. Witnessing of testing is required where works are not completed by a Recognised Contractor for sites where the existing protection device is to be replaced, or an existing protection device is to be physically disabled (i.e. not disabled by a change to settings).
Note: Loss of Mains settings change works will be covered under "self-certification" supported by evidence.
To become a Recognised Contractor an individual must
complete three successful relay replacement-commissioning tests, witnessed by
an SSEN engineer and completed to a satisfactory competence level in terms of
skill, processes and procedures. If an individual believes they have already
met this requirement they may provide evidence of this, i.e. dates of 3
previous commission tests witnessed by an SSEN engineer, giving the name of the
site and SSEN engineer who was present, for SSEN to consider. SSEN reserves the
right to require further witnessing of testing.
Recognised contractor status will be granted to individual
engineers only, not to a company or other entity. Where a company has several
engineers, they will each be required to gain individual approval via the above
Once recognised contractor status is achieved, e-mail
notification will be sent from SSEN to the contractor.
Where works are carried out under the self-certification
process, a sample site visit by SSEN may be required following receipt of
evidence of completed works.
If you wish to be considered for Recognised Contractor
Status please inform the SSEN engineer present at a Commissioning Test. They
will begin a record of visits and confirm when the criteria for recognised
status has been met. If you believe you have already met this criteria please
email details of your evidence to G59ProtectionSettings@sse.com.
Coronavirus Pandemic Response
According to Government and industry guidance concerning
the coronavirus pandemic the Accelerated Loss of Mains Change Programme
(ALoMCP) 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:
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 do this.
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.
Programme portal remains open for applications. We ask that the lead time
provided in new applications accommodates any estimated delay due to Covid-19
During these extraordinary COVID-19 conditions we understand
that you may be unwilling or unable to progress your ALoMCP works within the
The ALoMCP will keep the situation under review and update
this response as the situation changes and as more information becomes
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 has 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.
1. Where reference is made to government guidance we take this
to be the guidance published here.2. The Ofgem open letter to Network Companies is published here.
Find out more about the
accelerated programme, including a step-by-step guide and how to apply for
Download our document of recognised contractors.
If you have inverters and
know the make and model you may find information as to whether changes are
required in the Inverter Manufacturer Knowledge Base.
Download our presentation to customers (Aug 2019)
Fill out and submit your site details form online at the Energy Networks Association portal
Loss of Mains FAQs
Time to Comply Letter May 2021
Confirmation of Site Details Form
October 2020 flyer
March 2021 Webinar
January 2021 letter (5MW to 50MW)
October 2020 letter
March 2020 Webinar
April 2019 Stakeholder Event