Wärtsilä joins 5MWh club with latest BESS product

LinkedIn
Twitter
Reddit
Facebook
Email

System integrator Wärtsilä has launched a 5MWh, 20-foot container battery energy storage system (BESS) product.

The firm said its latest grid-scale solution, the Quantum3, has new safety, cybersecurity, energy density, and sustainability design features in a 20-foot ISO container form factor.

It is an AC block solution, meaning string-based power conversion systems (PCS) are integrated, enhancing the availability, efficiency, and reliability of the system, it claimed. The BESS is designed to achieve an optimal balance between energy density and weight, the company added.

Wärtsilä’s announcement did not reveal the energy storage capacity of the product, but a company spokesperson told Energy-Storage.news it is 5MWh. That is in line with most other grid-scale BESS solutions, including one launched last month by Canada-based EVLO.

This article requires Premium SubscriptionBasic (FREE) Subscription

Try Premium for just $1

  • Full premium access for the first month at only $1
  • Converts to an annual rate after 30 days unless cancelled
  • Cancel anytime during the trial period

Premium Benefits

  • Expert industry analysis and interviews
  • Digital access to PV Tech Power journal
  • Exclusive event discounts

Or get the full Premium subscription right away

Or continue reading this article for free

The company’s comment about balancing energy density and weight comes in light of concerns about the very most energy-dense 20-foot products potentially being too heavy for some roads and adding to shipping costs, expressed by Wärtsilä VP energy storage & optimisation Andy Tang in an interview in June (Premium access).

Referring to the Quantum3’s features, Tang commented in the announcement: “These are features we have worked extremely hard on and are very proud of. We have a proven track record of safe and reliable delivery worldwide. Quantum3 will help to further strengthen confidence among customers, local communities, and first responders that Wärtsilä’s systems will stand the test of time.”

The firm’s previous product, the Quantum2, packed 4MWh per 20-foot unit.

Its grid-scale BESS products can also be deployed in combination with its energy management system (EMS) platform, the GEMS Digital Energy Platform, which an executive discussed in a recent interview (Premium access).

Read Next

October 2, 2026
Welcome to another edition of hot takes, snap analysis, gossip and of course, valuable insights from the LinkedIn feeds of energy storage and electricity insiders.
October 1, 2026
Update 2 October 2026: The financial impact of the write-down to Wärtsilä’s full-year 2026 is expected to be significantly less than initially communicated.
September 18, 2026
A roundup of some of our key takeaways from the Energy Storage Summit Germany this week, including around FCAs, inertia, the capacity market (CM), EU restrictions on China, and the future of one very notable system integrator.
September 9, 2026
The global battery energy storage market is entering a new phase, with shifting cell prices, intensifying competition and rapid international expansion reshaping the supplier landscape.
Premium
September 4, 2026
Tesla was one of the pioneers of the grid-scale battery storage market, but has faced increasing competition in the past few years. In this article we look under the hood of its latest grid-scale BESS product, the Megapack 3.