Wärtsilä has signed an agreement with Aruba’s energy provider, Water- en Energiebedrijf Aruba (WEB Aruba), to integrate and optimise the island’s power generation assets through a 35 MW/70 MWh battery energy storage system (BESS). The project includes engineering, procurement and construction (EPC) services, a Wärtsilä energy management system and battery maintenance. The integrated solution aims to improve grid reliability, increase renewable energy integration and optimise power generation. Wärtsilä booked the order in Q3 2026, with final project handover scheduled for Q2 2028.
The integrated solutions will play a key role in strengthening the grid’s reliability, providing operation flexibility, increasing the system’s share of renewable energy, and achieving the lowest cost of energy delivered. At the time of this announcement, it is Wärtsilä’s largest energy storage project in the Caribbean region, both in terms of installed power capacity (MW) and energy capacity (MWh).
“WEB Aruba emphasises cleaner energy production, and our new agreement with Wärtsilä strongly supports this strategy. We currently generate power by utilising wind and solar energy along with our engine power plants. Wärtsilä’s well-proven technologies will allow us to optimise the overall energy system and provide the most efficient power output, while maximising our use of renewables,” says WEB CEO Alfredo Koolman.
The Wärtsilä energy management system will integrate the new battery energy storage alongside WEB Aruba’s existing power generation assets. Advanced forecasting, as well as the system’s secondary and tertiary control capabilities, will strengthen grid reliability and optimise dispatching.
The “As-a-Service” commercial model for the energy management system highlights Wärtsilä’s emphasis on driving continuous improvement beyond initial deployment. The service agreement will enable regular updating of the energy management system’s configurations and models and ensure fast access to technical support.
“With our solution, we will support WEB Aruba to improve the quality and reliability of providing power to the island as well as to reduce the cost of delivering it,” explains Risto Paldanius, Vice President, Americas at Wärtsilä Energy. “The combination of energy storage, energy management system, and services will boost efficiency and provide tangible support to WEB’s transition to greater penetration of renewables.”
Wärtsilä has earlier supplied WEB Aruba with the engines and equipment for five power plant projects, representing 230 MW of installed power capacity.
Wärtsilä Energy is at the forefront of the transition towards a 100% renewable energy future. We help our customers and the power sector to accelerate their decarbonisation journeys through our market-leading technologies and power system expertise. Our solutions include flexible engine power plants and services for the whole lifecycle of our installations. Our engines are future-proof and can run on sustainable fuels. Our track record comprises 81 GW of power plant capacity in 180 countries around the world. About 35% of our operating installed base is under service agreements.
Wärtsilä is a global leader in innovative technologies and lifecycle solutions for the marine and energy industries. We emphasise innovation in sustainable technology and services to help our customers continuously improve environmental and economic performance. Our dedicated and passionate team of 17,900 professionals in 199 locations in 78 countries shape the decarbonisation transformation of our industries across the globe. In 2025, Wärtsilä’s net sales totalled EUR 6.2 billion.
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