Keep Energy Systems

About Keep Energy Systems

Keep Energy Systems Limited, formerly known as Cheesecake Energy, is a UK-based company specializing in long-duration energy storage solutions. The company was founded in 2016 by Seamus Garvey and Michael Simpson as a spin-out from the University of Nottingham, building on over a decade of research. In June 2025, the company rebranded from Cheesecake Energy to Keep Energy Systems to better reflect its mission of providing resilience and reliability in the energy sector.

The firm is developing a proprietary energy storage system, known as eTanker, which stores electricity in the form of compressed air and thermal energy. This technology works by using electricity to power compressors, which generate heated, high-pressure air. The heat is captured and stored separately from the cooled compressed air. To release the stored energy, the process is reversed: the stored heat is used to reheat the compressed air, which then drives an expander connected to a generator to produce electricity. A key aspect of their model involves repurposing ex-service truck engines to function as zero-emission compressors and expanders, embodying circular economy principles. This approach is designed to lower capital expenditures and utilize existing manufacturing supply chains from the automotive and industrial sectors.

The company's business model targets commercial and industrial clients, renewable energy projects, electric vehicle fleet charging, and off-grid or weak-grid applications like mining operations and island communities. By providing a storage duration of 5 to 20 hours, the eTanker system aims to be a more cost-effective and sustainable alternative to lithium-ion batteries for stationary applications, projecting a 30-40% lower cost over its 25-year lifespan. Keep Energy Systems generates revenue by delivering these storage systems to clients who need enhanced power resilience, capacity, and cost-efficiency to manage grid constraints and integrate renewable energy sources.