ESS Tech acquires VoltStorage GmbH's assets and intellectual property

By Global Infrastructure Sherpa · Feb 24, 2026

Acquisition Battery Storage announced Germany Feb 24, 2026

ESS Tech acquired the assets and intellectual property of VoltStorage GmbH to strengthen its long-duration energy storage (LDES) portfolio and combine two iron-based flow battery technologies.

Deal Analysis

ESS Tech's acquisition of VoltStorage GmbH's assets and intellectual property represents a strategic move to consolidate and strengthen its position in the long-duration energy storage (LDES) market. By acquiring VoltStorage's iron-based flow battery technology, ESS Tech aims to enhance its existing portfolio and potentially create synergies through the combination of two distinct approaches within the same technology family. This acquisition suggests a focus on expanding technological capabilities and market share within the rapidly growing LDES sector.

Acquisition strengthens ESS Tech's LDES portfolio.
Combines two iron-based flow battery technologies.
VoltStorage GmbH's assets and intellectual property acquired.
Deal indicates a strategic focus on technological advancement in battery storage.

Market Context: The battery storage sector, particularly long-duration energy storage, is experiencing significant growth driven by the increasing need for grid stabilization and renewable energy integration. This acquisition reflects the competitive landscape and the strategic importance of technological differentiation within this market.

Source Intelligence

KEY DETAILS

VoltStorage GmbH ceased operations in mid-2025. Quote: "VoltStorage GmbH, a German developer of iron-salt battery technology that ceased operations in mid-2025."

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Location

Germany’s VoltStorage GmbH

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Announcement

February 24, 2026

PARTIES MENTIONED IN SOURCE

ESS Tech buyer

"US-based ESS Tech has acquired the assets and intellectual property of Germany’s VoltStorage GmbH"

VoltStorage GmbH seller

"US-based ESS Tech has acquired the assets and intellectual property of Germany’s VoltStorage GmbH"

medium quality Enriched Feb 24, 2026