by Mark Vyvyan Robinson, Business Development Director, Highview Power
As electricity systems integrate increasing volumes of renewable generation, the requirement for long-duration energy storage has become a defining challenge of the global energy transition. In northwest England, the city of Manchester and the surrounding Greater Manchester region are now home to a landmark project that highlights the growing role of cryogenic technology in meeting that challenge.
Construction is underway in Carrington, an industrial area southwest of central Manchester in the United Kingdom, on what will become the world’s largest commercial liquid air energy storage facility. Developed by Highview Power, the Carrington project is designed to deliver 50 MW of power with up to six hours of storage, equivalent to approximately 300 MWh. When operational in late 2026, the facility will provide grid-scale energy storage using a process rooted in established cryogenic engineering. Liquid air energy storage works by using surplus electricity, typically generated from renewable sources, to liquefy atmospheric air at cryogenic temperatures. The liquid air is stored in insulated tanks at low pressure until electricity demand increases. At that point, the air is reheated, expanded, and passed through turbines to generate electricity without combustion and without direct emissions.
Liquid air energy storage occupies a unique position among long-duration energy storage technologies. In addition to capturing excess renewable electricity that would otherwise be curtailed, it can provide a range of system services valued by electricity transmission operators. A key differentiator is the use of synchronous generation rather than power inverters. The synchronous generator used in Highview Power’s design can provide grid stability services even when the plant is operating at zero megawatts. This is achieved through mechanical decoupling using a clutch system, allowing the generator to support grid inertia and stability independently of power output. This capability is not available in inverter-based storage technologies and is becoming increasingly important as conventional thermal power plants retire.
From a siting perspective, liquid air energy storage offers a high degree of flexibility. Unlike pumped hydroelectric storage, which requires significant elevation differences, or compressed air energy storage, which depends on suitable underground caverns, liquid air facilities can be located wherever grid needs are greatest. This allows projects to be integrated directly into transmission networks without geological constraints. In terms of efficiency, liquid air systems are comparable to other mechanical and thermal long-duration storage technologies. Their value lies primarily in scalability, system services, and locational flexibility rather than round-trip efficiency alone.
The Carrington facility builds on more than a decade of development work by Highview Power, including pilot and demonstration plants that validated the liquid air energy storage cycle and informed system design. These earlier deployments provided critical insight into subsystem performance, operational behavior and integration with electricity markets.
Lessons learned from pilot facilities influenced several aspects of the Carrington design. These include optimizing startup and shutdown procedures, improving the responsiveness of the power recovery system to grid dispatch signals, and refining thermal store operation and thermal management strategies. Together, these improvements support higher availability and more predictable performance for a commercial grid asset. From an engineering perspective, the cryogenic components used in liquid air energy storage are not novel. Large-scale liquefaction systems, cryogenic storage vessels and thermal management equipment are widely used across the industrial gas and air separation industries. As a result, the primary challenges associated with commercial deployment relate to project execution and supply chain coordination rather than fundamental technical uncertainty.
The Carrington project is designed to support the integration of renewable energy into the UK electricity system. As wind and solar generation increase, periods of excess generation are becoming more frequent. Long-duration storage provides a mechanism to shift this energy across hours or days while also delivering ancillary services that support grid reliability. In the UK, long-duration energy storage is gaining policy support through the Cap and Floor regulatory framework administered by the Office of Gas and Electricity Markets, the energy regulator for Great Britain. This mechanism is intended to encourage investment in assets that provide system-wide benefits by offering revenue stability over long operating lifetimes. The Carrington project aligns closely with this framework and is expected to play a role in demonstrating the value of cryogenic energy storage within regulated electricity markets. https://highviewpower.com
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