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ARTICLE · 20 OCTOBER 2026

CMP470 Proposes Introducing An Oversubscribed Technologies Commitment Fee: What BESS Developers Need To Know

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CMP470 proposes a new Oversubscribed Technologies Commitment Fee mechanism to address the significant oversupply of Battery Energy Storage System projects in Great Britain's electricity grid connection queue. The modification introduces escalating security requirements and cancellation charges designed to encourage less viable projects to exit the queue earlier, potentially reshaping the landscape for energy storage developers seeking grid connections.

United KingdomEnergy and Natural Resources
Gus Wood
Gus Wood
James Stanier
James Stanier
George Nixon
George Nixon
Katherine Huet
Katherine Huet
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What is CMP470?

CMP470 is a Connection and Use of System Code (CUSC) modification proposal that proposes the introduction of an Oversubscribed Technologies Commitment Fee (OTCF) for certain 'oversubscribed technology' electricity generation projects connecting to the Great Britain transmission or distribution system. This is intended to set a floor on the amount of security these projects are required to provide to NESO in order to obtain a connection. It will also set a floor for the cancellation charge. The modification proposal was raised on 20 March 2026 by Field Energy and has been granted urgent progression status by Ofgem.

Why has CMP470 been proposed?

Following the TMO4+ connections reform package, certain protections introduced by NESO have meant that, for certain technologies, projects that have qualified for Gate 2 offers significantly exceed the Clean Power 2030 (CP30) capacity targets. Battery Energy Storage Systems (BESS) projects are particularly affected by this.

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