BW ESS, the Singapore-headquartered, BW Group-backed battery storage owner-operator, has acquired two utility-scale standalone battery energy storage projects in Spain’s Valencia region from Spanish developer Navacant, totalling 126MW and up to 675MWh of combined capacity. The individual projects — 99MW and 27MW respectively — have been in development for around 18 months and are targeting Ready-to-Build status in 2027, with commercial operations planned for 2028.
The deal is BW ESS’s second confirmed move into Spain inside 18 months. The company entered the market in mid-2025 through a co-ownership partnership with local developer Ibersun aimed at an initial 2.2GW pipeline of four-hour duration assets. At the time, BW ESS executive director Isaac García Moreno framed the push in urgent terms, saying “recent events have underlined that there’s no time to waste” — a likely reference to the blackout that had knocked out roughly 60% of Spain’s power generation barely two months earlier. The Navacant acquisition extends that pipeline with projects further along in development, rather than the greenfield model of the Ibersun deal.
Why Spain, and why now
The case for Spanish battery storage has two separate parts, and they’ve converged only recently. The first is physical: on 28 April 2025, Spain, Portugal and parts of southern France lost roughly 15 gigawatts of generation within seconds, in what remains, as of this writing, an unresolved-cause blackout — Spanish authorities and grid operator Red Eléctrica have ruled out both a cyberattack and renewable generation itself as the cause, with formal investigations by the Spanish government and the EU’s Agency for the Cooperation of Energy Regulators still ongoing. What investigators have pointed to is a more structural weakness: inverter-based solar and wind generation provides markedly less frequency regulation than conventional spinning generation unless paired with grid-forming or grid-supporting technology, and the Iberian Peninsula went into that afternoon with minimal battery storage and one of Europe’s lowest interconnection ratios relative to its neighbours. Grid-scale batteries are one of the more direct answers to exactly that gap, since they can supply or absorb power within milliseconds regardless of weather.
The second part is regulatory, and it’s what makes projects like Navacant’s investable rather than merely desirable. Spain’s storage sector has historically lagged peers such as the UK and Italy because it lacked a market mechanism to pay batteries for the reliability they provide. That changed on 29 May 2026, when the European Commission approved a ten-year, €9 billion Spanish capacity market built around competitive, pay-as-bid auctions; batteries that clear a primary auction can lock in contracted revenue for up to 15 years, against the one-year terms available to existing assets today. The mechanism responds to a reliability shortfall Spain’s own metrics already show: the country’s loss-of-load-expectation has been running at roughly 2.3–2.4 hours a year against a 1.5-hour target. Separately, Spain has also run a €360 million capex grant auction specifically for co-located battery projects, and the national target is 22.5GW of storage capacity by 2030 — against, according to BW ESS’s own account of the market when it entered via Ibersun, as little as 60MW of standalone batteries installed as of last year. Whichever precise baseline figure is used, the gap between where Spain’s storage fleet stands and where policy wants it by 2030 is measured in gigawatts, not megawatts.
The transaction itself
JLL acted as financial adviser to Navacant on the sale, through its Energy & Infrastructure Advisory practice for Iberia — a further sign, according to JLL’s Tomás García, of the firm’s push to build a lead position advising on European battery storage transactions specifically. Under the deal structure, Navacant’s partner CST Energy will continue leading the two projects through their remaining development phase to Ready-to-Build, drawing on local market and technical expertise, before BW ESS takes over delivery through construction and into operation — a staged handover BW ESS has also used in Italy, where it partners with developer ACL on regional projects.
BW ESS, which says it now has more than 540MWh of storage operating, roughly 11GWh under construction and around 8GW in its global development pipeline across six countries, framed the acquisition as a fit with its wider strategy rather than a one-off. “This requires partnering with developers who understand local market dynamics and can execute efficiently,” García Moreno said, citing Navacant’s track record and the projects’ “large-scale and symmetric grid access rights” specifically. Navacant partner César Izco described the transaction as validation of a development model combining “local market knowledge with rigorous technical execution to create institutional-quality assets.”
The deal also lands inside a busier Spanish storage market than the headline transaction alone suggests: Engie has separately been reported acquiring what’s described as Spain’s largest standalone battery portfolio in development, and market trackers logged a further 171.5MW/726MWh of Spanish battery projects advancing in July 2026 alone. For a market that spent years short of the regulatory certainty to attract this kind of capital, the current run of transactions suggests that certainty, however recently arrived, is now being acted on quickly.
