Kilmarnock South Commissioning
Discover how Zenobē’s Portable Power team used commissioning experience and battery expertise to develop an alternative solution to traditional commissioning.
Kilmarnock South grid-scale BESS
Delivering Grid Stability with 300MW of Battery Storage
300 MW
power capacity
3.3m
tonnes of CO2 emissions avoided
1.3 GW
storage assets operational in Scotland
Located near several offshore wind farms, the Kilmarnock South battery site provides Stability Services to support a more efficient and resilient grid. The site can respond instantly to grid events, delivering inertia traditionally provided by fossil fuel generators, enabled by grid-forming inverter technology that allows the battery to act as a stabilising force within the UK energy system. Kilmarnock South is one of a small number of BESS sites in the UK deploying grid-forming inverters to deliver these capabilities.
The challenge
Reliable grid stability is essential for decarbonisation. Unlike fossil fuel plants, renewable generation does not consistently provide key services such as inertia, reactive power, and short circuit level. These services are critical for maintaining system frequency, voltage, and fault response. As renewable penetration increases, alternative sources of stability are required to ensure a secure, reliable, and cost-effective electricity system.
The solution
Construction began in January 2024, and the site became operational in under two years from financial close.
To reduce on-site emissions, the 600MWh system was commissioned without a grid connection. Instead, Zenobē’s Portable Power team used a Mobile BESS to manage energisation and control inrush currents. This reduced generator size requirements by up to 30 times. The Mobile BESS used second-life EV batteries, demonstrating a closed-loop approach across Zenobē’s Network Infrastructure, EV Fleet, and Portable Power businesses.
The outcome
01.
Less wind curtailment
Ensuring the usage of homegrown renewables is maximised.
02.
CO2 emissions prevented
The site is expected to prevent 3.3m tonnes of CO2 emissions over 15 years of operation.
03.
Grid stability
Enhances grid stability without fossil fuel plants, accelerating the rollout of renewable power.
" Kilmarnock South is a landmark moment for Scotland – a world first, subsidy free battery that will reduce energy bills and strengthen Britain's energy security. This battery will contribute towards ending the absurd waste of clean Scottish wind power.
We're incredibly proud of what the Zenobē team and our supply partners have achieved. Reducing bills for consumers nationwide by harnessing more renewable power is a key criteria for Zenobē as we build out our battery fleet in the UK. "
We're incredibly proud of what the Zenobē team and our supply partners have achieved. Reducing bills for consumers nationwide by harnessing more renewable power is a key criteria for Zenobē as we build out our battery fleet in the UK. "
James Basden
Founder Director
The bigger picture
The path to 2030 and energy security
Kilmarnock South forms part of Zenobē’s £1bn investment in battery storage and clean transport in Scotland, with 1.3GW of storage either operational or in construction. It increases Zenobē’s operational capacity in the UK to 731MW in 2026, with a further 568MW / 1230MWh under construction.
The UK’s Clean Power 2030 Plan requires over 22GW of battery storage, making projects like Kilmarnock South essential. The site provides Stability Services, stores excess renewable energy, and reduces reliance on fossil fuel backup generation. This supports a more flexible grid while helping to lower electricity costs for consumers.
Zenobē will continue to engage with the local community through its Community Benefit Fund, administered by Foundation Scotland, alongside initiatives to support local education and training.
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