Who gets the most stationary energy storage batteries integrated into the grid? That’s been a question many have wondered about for years. Well, Wood Mackenzie has just started publishing a new report on this. Unfortunately, we’re not getting many details from Wood Mackenzie — no numbers for the top 10 integrators. However, it’s an interesting new report nonetheless. Most notably, the list is (unsurprisingly) dominated by Chinese companies. There were six Chinese companies on the list, two American companies, one South Korean company, and one Finnish company. Before getting into some of the general points and takeaways, let’s just jump straight into a look at the top 10. Here you go: Image Credit: Wood Mackenzie Sungrow — that’s who everyone had at #1, right? Maybe some of you expected that, but I didn’t. The next few companies were much more expected — Tesla, CATL, and BYD. The other US company on the list, Fluence, deserves a nod, and also LG from South Korea and Wärtsilä from Finland. But, of course, China is the big winner, with more than half of the companies on the list — and five out of the top six! Image Credit: Sungrow “The global battery energy storage industry reached a major milestone in 2025, surpassing 100 GW of annual installations for the first time. As battery storage becomes critical infrastructure for modern power systems, Wood Mackenzie’s first-ever Global Battery Energy Storage System (BESS) Integrator Comprehensive Ranking finds that buyers are increasingly selecting suppliers based on their ability to deliver across the entire project lifecycle,” Wood Mackenzie writes. “This ranking focuses on AC-integrated battery energy storage systems, defined as factory-assembled solutions that integrate the battery, power conversion system (PCS), battery management system (BMS), thermal management, and control systems into a single AC-connected product. “Wood Mackenzie’s comprehensive ranking reflects how utilities, independent power producers and developers increasingly evaluate integrators during procurement. Suppliers are assessed across ten criteria, including technology maturity, research and development, safety, vertical integration, supply chain resilience, ESG performance and financial strength.” How much will this list shift around in coming years? I’m curious to see. I wonder if some of the big dogs on here will be able to keep up with the competition in the coming years…. If you look even more broadly, at all of the “Grade A” battery integrators, China is again dominant (and I don’t think that’s going to change): Image Credit: Wood Mackenzie “The next phase of competition will be determined less by manufacturing scale alone and more by the ability to execute consistently across global markets,” said Timothy Shen, senior research analyst, solar supply chain at Wood Mackenzie. “As localisation requirements, financing expectations and technical standards continue to evolve, suppliers that can adapt while maintaining quality and delivery certainty will be best positioned for long-term growth.” Here’s more info from Wood Mackenzie on what they see as three “key competitive differentiators” among the leaders: Experience and execution capability. Six of the global top ten integrators have more than a decade of battery storage integration experience, reflecting the growing importance of system design, commissioning expertise and long-term operational performance as projects continue to increase in size and complexity. Higher value chain controls. Every company in the global top ten manufactures at least one critical system component including battery cells, power conversion systems or battery management systems, to support its own deployments. Vertical integration is helping improve product compatibility, strengthen quality control and reduce execution risk for customers delivering increasingly large and complex storage projects. Technology leadership and financial resilience Eight of the top ten exceeded Wood Mackenzie’s benchmarks for system efficiency and lifetime cycle performance, while nine invested more than 4% of annual revenue in research and development during 2025. Nine also reported positive profitability, providing greater confidence in their ability to support long-term warranties and service commitments as battery storage assets are increasingly expected to operate for decades. Interesting report, no? Your thoughts? (Yes, I wish we had actual figures for each of the leaders as well.)
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