Eelpower energises SUSI Partners’ Winchester battery storage site

Eelpower is delighted to announce that the 10MW Winchester battery storage project is now operational.


Winchester is the seventh project built by the Eelpower team, and the third in SUSI Partners’ portfolio of energy storage assets. It is a small but important step in the realisation of the company’s multi-GW storage platform vision.


The new Winchester site is part of the Constraint Management Zone (CMZ) around the Rownhams grid supply point in Hampshire – a key congested part of the national electricity grid. A CMZ is a local geographic region of the electricity network where there is a risk that capacity will be exceeded, and where the use of flexible services – such as demand side response, energy storage and stand-by generation – are vital.


Back in November 2017, Eelpower acquired a 10MW storage unit at Leverton in Lincolnshire, which was constructed by Anesco. This has been a leading provider of ancillary services to the System Operator for over 5 years (including delivering a landmark two year 24/7 frequency response contract through 2019 and 2020). The Winchester battery energy storage system (BESS) follows the same design successfully pioneered at Leverton, which has provided a high availability of 97.5% over 5 years of operation.


In January 2021 Eelpower signed a joint venture with SUSI Partners to accelerate the construction and operation of new build battery storage assets in the UK, of which the Winchester battery is the latest step. This multi-asset agreement will make a significant contribution to meeting the UK’s energy storage needs. Eelpower’s partners included EPC contractors Smith Brothers, who constructed the system, and route-to-market provider EDF Energy.


Eelpower CEO, Mark Simon, said: “Commercial operations for the Winchester battery is the next step in developing Eelpower’s GB storage platform. We are delighted to be working with SUSI Partners as we construct and operate a portfolio of high-performance grid-connected storage assets on our way to building a multi-GW electricity storage utility.”