Teesside GigaPark: How NatPower’s £1bn battery project aims to cut curtailment and electrify UK ports

NatPower UK has secured an agreement with Sembcorp Utilities (UK) Limited, a wholly owned subsidiary of Sembcorp Energy UK, for a 32-acre plot at Wilton International in Redcar, Teesside. On that site the developer will build the Teesside GigaPark, a grid-scale battery energy storage system rated at 1 gigawatt and expandable to 8 gigawatt-hours of duration. The £1 billion privately financed investment is designed to connect to the National Grid through a 400 kV interface and, crucially, will incorporate shore power infrastructure for ships — the first UK project of its kind. NatPower is targeting a 2028 connection under its existing 1 GW agreement with the National Energy System Operator.

The project will initially operate with four hours of storage, equivalent to about 4 GWh, with a pathway to double capacity to eight hours. Most UK batteries today provide only one to two hours of duration, making Teesside one of the longest-duration storage assets planned in the country. The developer has pitched the GigaPark as a “blueprint” for pairing large-scale storage with port electrification, enabling the system to balance the grid while also decarbonising maritime operations.

Why does a 1GW/8GWh battery at Wilton International matter for curtailment, grid stability, and the UK’s energy costs?

Britain’s energy system is straining under record levels of renewable generation and limited grid flexibility. National analysis suggests that wasted renewable energy — known as curtailment — costs the system billions annually. NatPower argues that its Teesside GigaPark will help reduce these losses by absorbing excess wind generation and releasing it during peak demand or low-wind periods. By displacing fossil-fuel peaker plants, the project is intended to stabilise prices, reduce emissions, and provide reliability for energy-intensive industries.

The timing is critical. Electricity demand in the UK is expected to rise by roughly 50 percent by 2050, with a further increase anticipated from the electrification of shipping. Multi-hour storage located at the heart of an industrial cluster positions Teesside to help manage these structural shifts.

How is this battery different, and why does combining utility-scale storage with shore power set a precedent for UK ports?

The GigaPark is being engineered from the outset to deliver cold-ironing capabilities — the supply of clean power to ships at berth so that diesel auxiliary engines can be switched off. This move not only reduces emissions from vessels while docked but also creates a platform for recharging electric propulsion systems as next-generation ships enter service.

By building shore power into a grid-connected battery of this scale, Teesside could become a model for other ports navigating a dual challenge: tighter emissions rules and increasing electrification of maritime transport. For the UK, it signals an industrial strategy that ties renewable integration to shipping decarbonisation on one industrial estate.

How does the Sembcorp Utilities site agreement at Wilton International de-risk the grid connection and support expansion to eight-hour storage?

The agreement with Sembcorp Utilities gives NatPower controlled access to a 32-acre site within Wilton International, a location with robust existing grid infrastructure and proximity to both heavy industry and port operations. This land deal ensures space for the initial build and for future augmentation, making it easier to extend storage from four to eight hours.

Sembcorp Energy UK described Wilton International as an ideal platform for long-duration storage and port electrification, underlining the site’s role as a strategic base for low-carbon industrial innovation within the UK’s Freeport network.

How can a £1 billion battery project proceed without subsidies, and what revenue models underpin NatPower’s private financing approach?

NatPower emphasised that the Teesside GigaPark is fully privately financed, with no subsidies or government contracts. The company expects to generate returns by stacking revenues across wholesale energy arbitrage, balancing and stability services, and eventually shore power demand from ships. Long-duration capability enhances the project’s ability to monetise spreads over extended periods and to provide capacity-like value during prolonged system stress.

Industrial adjacency is another revenue lever. NatPower is already in discussions with potential industrial offtakers in sectors such as chemicals, logistics, data centres, and clean manufacturing. Draft agreements are progressing, suggesting the site could support both grid-level services and direct supply contracts with high-consumption users.

What jobs, skills programmes, and community commitments will Teesside gain as the GigaPark moves from construction to operations?

Construction is expected to generate around 200 jobs, with permanent skilled positions in operations and maintenance once the facility is live. NatPower is working with local colleges and environmental organisations to establish clean-energy and engineering training pipelines, and is exploring academic partnerships on smart grids, offshore wind maintenance, and marine decarbonisation.

The company has also pledged to contribute up to £2 million annually to a community benefit fund managed by Evogea, creating a recurring flow of local funding tied directly to the project’s operations. For Teesside, this is as much about social infrastructure as it is about megawatts.

What milestones and institutional signals will define success for NatPower’s Teesside project before the 2028 grid connection?

Over the next three years, execution will hinge on completing detailed design, securing equipment procurement, finalising the 400 kV grid interface, and commissioning shore power capability at berth. Progress on industrial offtake agreements will be watched closely, as long-term contracts can diversify revenues beyond volatile wholesale spreads.

Regional stakeholders, including Sembcorp Energy UK, are framing Wilton International as a strategic testbed for low-carbon innovation. NatPower’s chief executive described Teesside as the company’s most advanced GigaPark to date and a model that can be replicated in ports worldwide once proven.

Institutional investors are generally constructive on long-duration storage in the UK, provided projects have credible grid access and proximity to large offtake loads. Teesside’s combination of a secured grid connection, Freeport location, and built-in maritime demand is expected to appeal to infrastructure investors who prioritise diversified cash flows.

Can Teesside become a blueprint for port-integrated, long-duration storage, and what would replication mean for the UK and global markets?

NatPower sees Teesside as a template that could be rolled out across other ports, turning batteries from standalone grid assets into multi-purpose industrial backbones. By reducing renewable curtailment, providing reliable power to industry, and enabling shipping decarbonisation, the GigaPark’s integrated model could demonstrate how clean infrastructure can cut system costs while enhancing regional competitiveness.

If successfully delivered, the project would mark a turning point for the UK’s approach to both storage and port electrification. Instead of siloed investments, Teesside offers a unified platform where a £1 billion battery underpins grid reliability, industrial resilience, and maritime emissions reduction.