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Loss of Mains Change Programme

Find out more about SP Energy Networks' role in National Grid ESO's accelerated Loss of Mains Programme, developed to support the implementation of changes to protection settings for generators.

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

In the past, loss of mains protection would have seen generating assets being disconnected when necessary to stop any damage when problems occurred on the electricity distribution network. That would often have resulted in the costs of trying to stop any disruptions being paid for by the consumer and electricity industry, e.g. when renewable generation was running.

Required changes have been identified under the LoM programme to deliver better efficiencies in the operation of the distribution network in this way, allowing low carbon assets to operate at lower costs.

The LoM programme requirements specify that as well as these new requirements being applicable to new generation connecting to the network, they must also be applied retrospectively to all existing generation with loss of mains protection.

So as a generator, what do I need to know?

It is now a requirement of the Distribution Code – which all generators must adhere to – that all owners of generation installed prior to February 2018, 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 31 August 2022 to do so. Those who have not made these changes by the specified date may then be subject to an enforcement programme.

Support will be available to make these changes, including the opportunity to apply for a financial contribution to support the necessary work required (subject to availability and specific criteria), and a new portal is now available to allow such applications to be submitted.

Please visit the Energy Networks Association website for further information and to access the portal.

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