Help and support

What is the Accelerated Loss of Mains Change Programme?

There has been an important and mandatory change to the Distribution Code related to Feed-in Tariff Installations.

Many installations connected to the national energy network (including wind, solar and other types of generating equipment) installed before Feb 2018 must incorporate a crucial change in the protection settings on the inverter. These changes are required to improve network resilience and to reduce risk of power cuts.

Funding is being offered through the National Grid’s Accelerated Loss of Mains Change Programme to help any Generators requiring the changes.

Does this apply to my installation?

Generally, the installations requiring these changes will have a capacity of between approximately 10kW and up to 50MW – however there could be installations with lower capacities which still require the changes. (Your installation’s capacity and installation (Commissioning) date are recorded on the MCS certificate).

As the owner of your installation, it’s your responsibility to check if changes are required and if the change is necessary, you are bound by the Distribution Code to incorporate the changes by 01 September 2022.

To find out if the changes are required for your installation and to apply for funding, please visit the Energy Network Association’s Accelerated Loss of Mains Change Programme information website

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You can also search for your inverter by make on the Manufacturer Knowledge Base by clicking

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The funding to cover these mandatory changes will run until May 2022 and we urge you to apply at the earliest opportunity. 

Getting further help

Our role in this process is to notify potentially affected customers and unfortunately, we cannot offer technical advice about individual installations.

The best people to help you with any queries are your Distribution Network Operator (DNO) or the original installer of your generating equipment.

Your DNO (or electricity distribution company) can be found by entering your postcode on the Energy Network Association’s

. Your DNO is also noted on the Electricity page of your bill under ‘Supplier Details’.

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