Invinity Energy Systems has nearly tripled first-half customer orders as it moves its Endurium vanadium flow battery platform towards higher-volume manufacturing and larger grid-storage deployments.
Orders reached 34.2MWh during the first half of 2026, compared with 11.7MWh in the same period last year. Since the half-year ended, Invinity has secured a 43MWh order from Dairyland Power Cooperative in the United States, taking customer orders secured during 2026 to 77.2MWh.
The Dairyland contract is the largest single order in Invinity’s history and is expected to be supplied from a proposed US manufacturing facility that the company says remains on track to be established by year-end.
Jonathan Marren, Chief Executive Officer of Invinity Energy Systems, described the period as “a clear step forward in our transition from technology leader to commercially scaling business”.
Manufacturing scale has become the more immediate question as the company moves beyond individual demonstration projects. Its first commercial Endurium delivery has been completed, while the 20.7MWh Copwood installation in East Sussex has been delivered and is awaiting grid connection.
In Switzerland, Invinity is supporting development of the FlexBase project at Laufenburg, which was initially designed around 1.5GWh of storage capacity and has subsequently expanded towards 2.1GWh. Those projects sit considerably above the scale of Invinity’s historic installations and would require a different production system if they progress into full equipment orders.
Endurium is the company’s latest vanadium flow battery platform. Flow batteries store energy in liquid electrolyte held in external tanks, separating the amount of energy stored from the electrochemical stack that determines power output.
Increasing storage duration can therefore be achieved largely by adding electrolyte and tank capacity rather than proportionally increasing the number of electrochemical cells. The architecture is suited to stationary applications where repeated cycling, long service life, and multi-hour operation carry more weight than the compact packaging demanded by vehicles or consumer devices.
The same architecture gives manufacturing a different character from lithium-ion pack assembly. Tanks, pumps, pipework, electrolyte management, stacks, power electronics, thermal systems, controls, and site integration all contribute to the finished installation, making product standardisation and repeatable factory assembly important to reducing cost.
Invinity says it remains on track to reduce Endurium product costs for 2027 deliveries by at least 66% compared with its previous generation. Achieving that target requires improvements across procurement, engineering, component design, manufacturing throughput, and installation rather than a single reduction in electrochemical material cost.
Larger order volumes can help by allowing the company to negotiate component supply more effectively and repeat the same manufacturing process across multiple units. The benefit depends on avoiding project-specific engineering that turns each battery installation into a largely bespoke product.
The financial figures show both progress and the distance still to travel. First-half revenue increased to approximately £1.1 million from £256,000 a year earlier, while gross loss narrowed to £727,000 from £1.93 million. The business remained loss-making as spending continued on product development, manufacturing preparation, and commercial expansion.
Invinity’s operating fleet has now dispatched more than 11GWh of energy. Long-duration storage buyers place considerable weight on that operating evidence because degradation, availability, pump performance, stack condition, and maintenance costs only become clear after systems have accumulated substantial cycling hours.
Vanadium electrolyte has the advantage of not being consumed during normal cycling, but the wider system still contains mechanical and electrical components that require inspection and maintenance. Demonstrating predictable lifecycle behaviour is therefore central to converting technical interest into financeable grid projects.
The proposed US facility adds another manufacturing variable. Local production could shorten supply routes and provide access to domestic-content opportunities, but establishing a new factory also requires tooling, quality systems, trained employees, qualified suppliers, and stable processes before output becomes repeatable.
The 43MWh Dairyland order provides a tangible starting workload for that operation if the plant opens as planned. Combined with existing UK production and the wider project pipeline, it gives Invinity a larger contracted base from which to standardise Endurium manufacturing.
The immediate industrial test is no longer whether a vanadium flow battery can operate successfully. Invinity has enough field experience to answer that question across multiple systems. The harder step is converting the technology into a product that can be manufactured repeatedly at materially lower cost while project sizes move from tens towards hundreds or thousands of megawatt-hours.
Secured 2026 orders of 77.2MWh remain small beside the global lithium-ion storage market, but they create a more credible production base for that transition. Delivery performance, the proposed US plant, and the targeted Endurium cost reductions will show whether the company can translate a larger sales pipeline into repeatable industrial output.
