Wärtsilä enters Wood Mackenzie’s global top 10 BESS integrators

Wärtsilä Wood Mackenzie strengthens its position in the global energy storage market after ranking among the top 10 battery energy storage system (BESS) integrators. The company is also the only European-based firm included in the global top 10.

The recognition comes as batteries gain increasing importance within electrical systems, the first comprehensive ranking of BESS integrators, compiled by Wood Mackenzie, analyzes capabilities that go beyond equipment supply and considers aspects related to technology, safety, execution, and operational performance.

Furthermore, the Finnish company stands out within a group of suppliers evaluated for its ability to develop solutions for increasingly larger and more technically complex projects.

Specifically, Wood Mackenzie examined ten criteria, including technological maturity, research and development, security, supply chain resilience, environmental, social, and governance (ESG) performance, and financial strength. Experience in execution was also identified as a competitive differentiator.

Wärtsilä gains ground among global BESS integrators

Today, deploying batteries on a large scale involves much more than simply installing modules capable of storing electricity. As projects increase in size and complexity, aspects such as design, integration, commissioning, digital control, and maintenance become increasingly important.

This evolution helps explain the relevance of the ranking. Wood Mackenzie believes that competition within the sector is evolving towards a scenario where the ability to successfully execute projects in different markets is crucial.

For developers and operators, this transformation poses new demands, a BESS installation it must respond to specific network conditions, operate reliably, and adapt to electricity markets that may change over decades of activity.

Therefore, the experience accumulated during construction is only one part of the equation, subsequent performance, the availability of digital tools, and lifecycle support also become relevant elements in determining the value of each asset.

Wood Mackenzie evaluates ten criteria in its ranking

Furthermore, the methodology includes ten criteria for comparing suppliers, among the aspects disclosed are technology maturity, research and development, security, supply chain resilience, ESG behavior and financial strength.

Execution experience was identified as one of the main competitive differentiators, this includes capabilities related to system engineering, commissioning, and long-term operation of facilities whose scale continues to grow.

This approach reflects a transformation within the business, a BESS integrator must coordinate multiple components to ensure they function as a whole and adequately meet the technical and commercial requirements of each project.

Thus, the value of the provider ceases to be focused exclusively on hardware, the ability to combine equipment, controls, software, network knowledge, and specialized services takes center stage within the technological proposal.

Software plays a more significant role within BESS systems

In this context, Wärtsilä combines its integrated storage solutions with GEMS Digital Energy Platform, a platform designed to optimize asset performance throughout their useful life.

According to the company, GEMS helps maximize revenue, improve reliability, and respond to evolving market requirements. This capability is especially relevant for facilities that may participate in various electrical applications and services.

And battery system it can perform functions related to flexibility, grid balancing, and energy management. Its economic performance therefore depends on how available capacity is managed and how the asset responds to different operating conditions.

Consequently, software takes on a strategic role, digital controls allow for the management of facilities and better utilization of their potential as the needs of the electrical system change.

For the Finnish company, this combination of physical infrastructure and digital tools is one of the cornerstones of its strategy as an integrator. The organization has over a decade of experience in energy storage and has executed projects in international markets.

Long-term execution and support define the competition

Tamara De Gruyter, president of Wärtsilä Energy Storage he explained that customers are paying closer attention to execution, operational performance, and long-term support as these facilities are increasingly considered critical infrastructure.

According to the directive, the recognition reflects a model that combines project delivery expertise, advanced software, and services throughout the entire lifecycle. The goal is to help owners get more value from their energy storage investments.

The statement points to one of the relevant changes this segment is going through the supplier’s involvement can extend after a facility starts operating through tasks related to optimization, maintenance, and technical support.

Don Lee, vice president of operations, also emphasized the importance of the experience that underpins the technology. From his perspective, the ability to deliver, optimize, and support assets for decades will be a differentiating factor as storage increases its presence within energy systems.

Batteries are advancing as critical infrastructure

As the importance of energy storage within the electricity sector increases, BESS facilities are gaining a growing presence as infrastructure capable of managing energy and responding to the operational needs of the networks.

Wood Mackenzie’s classification points precisely to this change of scale, as facilities become larger and more technically complex, the integrator’s experience can influence different stages such as design, construction, commissioning, control, and operation.

Furthermore, safety occupies a relevant place within the evaluation the growth of the sector obliges suppliers and developers to consider the behavior of the batteries throughout the service period along with the particular characteristics of each installation.

Supply chain resilience is another factor considered by Wood Mackenzie, these projects require numerous components, and the supplier’s ability to manage supply is part of the overall assessment of its competitiveness.

This combination is further enhanced by research and development and financial strength, thus allowing the analysis to view participants from a broad perspective rather than solely comparing their ability to supply equipment.

GEMS Digital Energy Platform promotes optimization

One component of Wärtsilä’s proposal is its GEMS platform, developed to manage and optimize energy systems during operation. This digital tool is part of a strategy where hardware and software work in an integrated manner. Its function is to help manage asset performance and facilitate adaptation to requirements that may evolve throughout the project’s lifecycle.

This approach is important because storage facilities can remain operational for years in markets subject to technical and commercial changes. Having digital capabilities allows them to adjust their performance in response to these conditions. Furthermore, optimization can directly impact economic performance. According to the company, GEMS helps maximize revenue and improve project reliability.

The integration of digital components with physical systems demonstrates how the profile of BESS providers is changing. Competitors increasingly understand the ability to manage entire assets and support them through different operational phases.

An international presence with over 130 locations

Wärtsilä Energy Storage reports a presence in over 130 sites worldwide, its portfolio includes high-performance hardware, intelligent controls, optimization software, and services designed to cover various project stages. This activity is part of a technology group with international operations. The company employs approximately 17,900 professionals across 199 locations in 78 countries.

During 2025, its net sales reached €6.2 billion, the organization is also listed on Nasdaq Helsinki and operates in the energy and maritime markets. This data provides insight into the business structure that supports its battery systems division. However, Wood Mackenzie’s ranking focuses specifically on the capabilities needed to compete as an integrator.

Wärtsilä’s presence as the only European-based company in the top 10 adds a regional dimension to the results. For the Finnish firm, this represents a prominent position within a technological activity that is gaining importance in the global energy sector.

The life cycle becomes a competitive factor

Another key element of the ranking is the emphasis placed on long-term performance, the increasing complexity of projects means that the relationship between integrator and owner can extend far beyond the initial handover. Maintenance, optimization, and technical support become integral to a strategy aimed at preserving performance throughout the asset’s lifespan. This implies that operational expertise can carry comparable weight to the technology used during construction.

Furthermore, owners seek to reduce uncertainties related to availability, operation, and future adaptation, a battery infrastructure represents a long-term investment, and its performance over years can determine the project’s financial results. For this reason, Wood Mackenzie identifies implementation experience as a differentiator in the market. Proper design and commissioning are important, but subsequent performance is also part of the supplier’s overall capability.

The BESS world ranking will be updated annually

Finally, Wood Mackenzie plans to publish his [newspaper/article] every year Global BESS Integrator Comprehensive Ranking the evaluation analyzes battery energy storage system providers based on their performance during the previous calendar year.

This periodicity will allow us to observe how the competition evolves as projects scale and new technical needs emerge. It will also provide a benchmark for tracking companies that combine hardware, software, and services within large-scale facilities.

For Wärtsilä, entering the first edition of the top 10 represents recognition of its presence in a market where differentiation increasingly depends on comprehensive execution. Designing systems, implementing them, optimizing their performance, and supporting them for years are capabilities that carry significant weight in industry assessments.

In this way, the expansion of batteries is changing the profile of suppliers, energy storage is moving towards a broader function within electrical systems that require reliability, management capacity and digital tools.

The position achieved by the Finnish company reflects precisely this transition the BESS market is beginning to value technology, operational experience, financial capacity, security, software, and long-term support together. As the international deployment of these installations increases, these competencies will play a significant role in the selection of integrators for new projects.

Source: Wärtsilä

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