New contracts awarded under the Mid-Term (Y-1) Stability Market Round 2

We’ve awarded five contracts across four providers to secure 7.3 GVA.s of inertia between October 2026 to September 2027 under the Mid‑Term (Y‑1) Stability Market. Following a rigorous assessment process, these contracts represent an estimated cost of £10.3 million and are expected to deliver up to £44.4 million in consumer savings.

In 2021, we launched the Stability Market Design innovation project to explore the development of enduring stability markets across multiple timescales. The project identified the need to establish dedicated markets for stability services spanning short to long‑term horizons.

When the  Mid‑Term (Y‑1) Market launched in 2023 it was the first of our enduring markets to secure high‑availability inertia from existing assets. The award of these latest contracts is the result of the second tender round which launched in November 2024. When called upon during periods of system need, these providers will provide cost‑effective, zero‑carbon inertia solutions to maintain the stability of Great Britain’s electricity grid. Find out more about how Inertia keeps our grid stable here. 

At NESO, we remain committed to developing stable, transparent, and efficient markets that deliver long‑term consumer value while supporting a secure and decarbonised electricity system.

To see the detailed tender results, click here.

Stability Market