BW ESS and Ibersun sign joint venture to develop 2.2GW BESS in Spain
24 June 2025, MADRID — Global energy storage owner-operator BW ESS and Getxo-based energy storage developer Ibersun have signed a joint venture to develop, in its first phase, 2.2GW of utility-scale battery energy storage system (BESS) projects across Spain.
The Spanish battery energy storage market is growing to become one of the largest in Europe and the country’s National Integrated Energy and Climate Plan sets the target at 22.5 GW by 2030. Spain’s increasing need for energy storage capacity is driven by a growth of solar and wind generation and intensified by the limited interconnection between the Iberian peninsula and its European neighbours. In addition to stabilising the energy grid, the expansion of Spain’s BESS fleet will also prevent energy from being wasted, when supply exceeds demand.
The joint venture, targeting greenfield, four-hour duration assets, will progress an initial 2.2 GW pipeline of eight projects across Spain. These projects will be owned equally by BW ESS and Ibersun. The partners expect each project to achieve Ready-to-Build status within two years and anticipate pursuing a diverse range of revenue generation strategies.
Based in the Basque Country and founded by executives with more than 25 years’ experience in the energy sector in Spain and worldwide, Ibersun has been developing renewable energy projects in Spain since its establishment in 2019 with a focus on solar and, more recently, BESS.
Isaac Garcia Moreno, Executive Director of BW ESS, said: “We are proud to be developing our first projects in Spain with Ibersun, a trusted partner with over 25 years of market experience. We have a common objective to improve Spain’s grid resilience and support the market’s ambitious energy storage growth targets. Recent events have underlined that there’s no time to waste in working towards these goals, and we look forward to applying a wealth of experience drawn from multiple global markets to the Spanish context.”
Javier Arkotxa and Jose Antonio Gutiérrez, Directors and Founders of Ibersun, added: “It’s essential for us that our work blends seamlessly and respectfully with its surroundings and we are delighted to be partnering with a business who shares these priorities. Spain is one of the largest markets for BESS and our joint venture with a global leader like BW ESS is going to help us in our efforts to continue developing the country’s energy potential.”
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About BW ESS
BW ESS is a global energy storage owner-operator, moving with speed to develop and build market-leading energy storage projects across multiple countries.
Typically working with local development partners, the business is active in the UK, Australia, Italy, Germany, Spain, and Sweden. It has more than 500MWh of operating BESS projects, with over 2.5GWh under construction and a development pipeline of about 9.5GW.
BW ESS has a strategy to hold assets for the long-term, taking a hands-on approach to unlock value throughout the energy storage asset lifecycle.
Part of BW Group, BW ESS can leverage a global industry network, as well as decades of experience in energy infrastructure investment, delivery, and operation. To find out more, visit: https://bw-ess.com/
About Ibersun:
Ibersun is a Spanish developer, focused in solar and BESS with more than 4.3 GW of solar projects developed since 2019. Working closely with landowners and local and regional institutions across Spain. Ibersun is focused on providing bankable projects thanks to its team experience with more than 10GW developed in 23 countries.
Media contacts:
Andrea Pavlović
Tamarindo
bwess@tamarindo.global
Jose Antonio Gutiérrez
Ibersun
corporate@ibersun.es