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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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Samsung SDI: 60GWh of ESS battery orders in 2026 so far, 53% year-over-year ‘revenue surge’

Fluence CEO Julian Nebreda and CFO Ahmed Pasha leave with immediate effect

BESS Industry Buzz: Sonnen’s collapse, BESS contracts, new market entrants and over-reporting availability

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BESS augmentation: what owner-operators need to know

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Trump bulk power equipment ban sparks industry pushback: ‘Let’s not reinvent the wheel’

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FERC’s rulings on PJM, home of ‘Data Centre Alley,’ put the spotlight on states

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