Adding stability to Texas' grid
Amidst a rising frequency of extreme weather events, increasing penetration of intermittent resources and the need for fast-responding generation in Texas, the state needs more flexible resource solutions like energy storage for grid support and energy resource optimisation.
With over 500 megawatt-hours (MWh) of capacity as a combined project, Madero and Ignacio provides the longest duration of any energy storage assets currently operating in ERCOT through the facility’s multi-hour continuous dispatch capability.
| Who | Eolian |
| What | 200 MW / 500 MWh+ |
| Where | South Texas, USA |
MW of energy storage capacity
MWh+ of energy storage capacity
In the midst of an uncertain market redesign process, Eolian invested hundreds of millions of dollars to construct these projects using cutting-edge technology. Madero and Ignacio are the definition of functional dispatchability and will keep the lights on while keeping electricity affordable.
| Customer | Eolian |
| Site size | 200 MW / 500 MWh+ |
| Site location | South Texas, USA |
| Application(s) | Fast Frequency Response (FFR), Frequency Regulation, Responsive Reserve Service (RRS), Storage+ |
| Scope of services | Engineered Equipment Delivery (EEQ), Service+ GAP |
| Delivery | 2023 |
Technology group Wärtsilä has been selected by Gramme Storage 1 to deliver a 50 MW / 100MWh battery energy storage system in central-eastern Belgium. Through the Gramme 1 project, Wärtsilä and Gramme Storage 1 will support Belgium’s transition toward a more sustainable, efficient, renewable energy system. Construction is now underway and the site is expected to be completed by Q2 2027. The order was booked in Q2 2025.
“This project with Wärtsilä underscores our commitment to dependable, flexible energy in Belgium”, said Guillaume Poncelet, Managing Director at Kallima Energies – the Liège based developer of the project. “This collaboration highlights the growing role of battery energy storage in supporting Belgium’s electricity system. By delivering essential ancillary services, the system will play a vital role in balancing the grid.”
Gramme 1 represents Wärtsilä’s first energy storage project participating in Belgium’s Capacity Remuneration Mechanism (CRM). This framework is designed to ensure Belgium’s energy supply security by enabling assets to deliver essential grid services such as frequency and voltage support that contribute to electricity system resilience and dependability.
“This project in partnership with Gramme Storage 1 reflects our shared focus on supporting Belgium’s energy security and grid stability during the transition to a more renewable power system,” said David Hebert, Vice President of Global Sales Management, Wärtsilä Energy Storage. “Wärtsilä’s advanced technology will enable the site to provide critical ancillary services that support a resilient, future-ready grid.”
Gramme 1 will utilise Wärtsilä's GridSolveTM Quantum2 energy storage system together with its control and optimisation software, GEMS, to deliver a standalone, fully integrated solution that enhances grid flexibility, reliability, and sustainability. Wärtsilä will also deliver the project under an engineered equipment delivery (EEQ) contract, with guaranteed asset performance under a separate long-term service agreement. With this project underway, Wärtsilä’s energy storage portfolio in Europe now exceeds 2.7 GWh.
Media contact for more information on this release:
Amanda Young
Director, Marketing & Communications
Wärtsilä Energy Storage
[email protected]
Image caption: Wärtsilä begins construction of a 50 MW / 100 MWh energy storage system in Belgium. © Wärtsilä Corporation
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Wärtsilä Energy Storage in brief
Wärtsilä Energy Storage is at the forefront of the transition towards a 100% renewable energy future. We help customers accelerate global decarbonisation efforts by combining proven technologies with deep grid expertise. Our portfolio includes high-performance hardware, intelligent controls and optimisation software, and full-service lifecycle support to deliver lasting value across the project lifespan. From enhancing grid stability to unlocking flexibility and operational efficiency, our utility-scale battery energy storage solutions are built for real-world performance. Trusted by top-tier utilities, developers, and system operators, Wärtsilä Energy Storage has a global footprint across 130+ sites—delivering the scale, safety, and reliability needed to power the energy transition.
www.wartsila.com/energy
Wärtsilä in brief
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 6.9 billion. Wärtsilä is listed on Nasdaq Helsinki.
www.wartsila.com
