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FlexGen claimed its customers maintained 98% annual availability across their BESS projects, with 99.7% uptime for assets affected by Winter Storm Uri. Image: FlexGen
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Availability: Why this BESS performance metric matters so much, and how to calculate it

September 30, 2026
Liam Critchley with an ESN Premium deep dive into availability, one of the most-discussed metrics in battery storage performance.
Fluence's flagship SmartStack BESS solution. Image: Fluence.

DNV verifies 98.7% availability of Fluence’s global battery energy storage fleet

June 11, 2026
DNV has independently verified that Fluence’s global fleet of battery energy storage systems (BESS) achieved 98.7% MW-weighted availability.
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BESS Industry Buzz: Optimisation and curtailment in GB, deal-making and revenues across Europe

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B2U CEO: US second-life BESS can compete with ‘China price’

South Korea unveils US$475 billion Green Transformation industrial strategy

Chile: Engie commissions 802MWh BESS, Grenergy finances 1,769MWh

‘You need to get comfortable with regulatory reform as a known risk’: Battery Asset Management Summit UK & Ireland kicks off

Energy Storage Awards 2026: Shortlist reveal kicks off countdown to the industry’s big night out

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