Global Long-Duration Energy Storage Market Outlook to 2032

Executive Summary

Long-duration energy storage is moving from pilot to first commercial deployment. The LDES market grows from US$5 billion in 2024 to US$45 billion by 2032 at 30% CAGR, anchored by storage projects of more than 10 hours across iron-air (Form Energy), CO₂ (Energy Dome), gravity (Energy Vault), and flow battery (ESS, Invinity) technologies.

Three forces drive the trajectory. Commercial deployments arrived in 2025: Form Energy delivered its first commercial iron-air shipment to Great River Energy (Minnesota, July 2025); Energy Dome's CO₂ storage facility in Ottana, Sardinia (200 MWh / 20 MW over 10 hours) commissioned in July 2025. Hyperscalers emerged as a new buyer cohort, with Google contracting multi-region Energy Dome deployments and ESS Inc's SRP/Google Project New Horizon (5 MW / 50 MWh, manufacturing 2026, delivery December 2027). And the DOE Long Duration Storage Shot anchors the cost-curve target: 90% cost reduction by 2030 for storage of more than 10 hours.

Market Overview

LDES is grid-scale energy storage with discharge duration of 10 hours or more, distinct from the 4-hour lithium-ion BESS that dominates short-duration deployment. The category includes iron-air (Form Energy), CO₂ thermodynamic (Energy Dome), gravity (Energy Vault), vanadium and zinc-based flow batteries (Invinity, ESS), thermal (Brenmiller, Antora), compressed air (Hydrostor), and flow chemistries.

The category sits at the intersection of three forces. Renewable-electricity penetration above 50-60% in saturated grids (California, ERCOT, NEM Australia) requires multi-day storage to firm intermittent supply. Hyperscaler data-centre power demand (forecast four times growth through 2030) drives carbon-free 24/7 procurement that LDES enables. And the cost curve target (DOE 90% by 2030 for durations longer than 10 hours) is the binding economic threshold for replacing natural gas peakers.

Geopolitically, LDES technology is concentrated in the US (Form Energy, ESS, Antora, Hydrostor), Europe (Energy Dome, Brenmiller), and emerging Chinese capacity. Critical-mineral exposure varies materially: iron-air and CO₂ are mineral-light; vanadium flow has supply concentration in China and Russia; lithium-based options compete directly with EV chemistry.

Market Size and Growth Outlook

The 2024-28 phase compounds at 33-37% as Form Energy, Energy Dome, Energy Vault, and ESS Inc deliver first commercial-scale projects, and California CPUC LDES procurement (2 GW: 1 GW 12-hour and 1 GW multi-day, deployment 2031-37) and DOE Storage Shot funding flow into project FIDs. From 2030 onward, growth moderates to 22% as the easy first-of-a-kind projects saturate and the next wave depends on the cost curve hitting DOE Storage Shot targets.

Market Segmentation

By Technology

Iron-air at 28% leads on Form Energy's commercial scale-up trajectory. Vanadium and zinc flow hold approximately 22% but face cost-competitiveness pressure from emerging chemistries. CO₂ thermodynamic at 18% is anchored by Energy Dome Sardinia and the Google partnership. Gravity (Energy Vault) reached approximately 14% of pipeline but commercial conversion has been mixed.

By Buyer Cohort

Hyperscaler and corporate at 14% is the fastest-growing buyer cohort, expanding from negligible in 2022 to over 20% by 2030. Google's multi-region Energy Dome deployment and the SRP/Google ESS Inc project (Project New Horizon) signal data-centre power-security demand. Investor-owned utilities at 38% lead through 2030 anchored on California CPUC mandate and emerging long-duration RA frameworks.

By Region

The US leads on California's procurement framework and MMUA early commercial deployments. Europe scales on Italian (Energy Dome Sardinia, A2A), German, and UK projects. Australia's NEM expansion drives Asia-Pacific scale.

Trends and Developments

Form Energy first commercial shipment and pipeline scale-up

Form Energy delivered its first commercial iron-air shipment to Great River Energy (Cambridge, Minnesota; 1.5 MW / 150 MWh; broke ground August 2024; online late 2025). Subsequent deployments include two 10 MW / 1,000 MWh systems with Xcel (Minnesota Sherco Solar and Colorado) and Georgia Power 15 MW / 1,500 MWh targeting 2026. Series F US$405 million October 2024 (T. Rowe Price-led, GE Vernova partnership) funds manufacturing scale-up.

Energy Dome CO₂ storage commercial scale

Energy Dome's commercial facility in Ottana, Sardinia commissioned July 2025: 200 MWh / 20 MW over 10 hours. Customers include ENGIE (offtake December 2024), A2A (20 MW / 5 hr), Alliant Energy Wisconsin (2026, 18,000 homes equivalent), and Google (multi-region data centre deployment). The CO₂ thermodynamic pathway uses no critical minerals and provides 25-year asset life.

ESS Inc going-concern flag and consolidation pressure

ESS Inc filed its 2025 10-K with a going-concern flag: US$22 million cash, US$63.4 million annual loss (improved from US$86.2 million), 62 employees, pivoted to Energy Base 12-14 hour product. The SRP/Google Project New Horizon (5 MW / 50 MWh; design in progress; manufacturing 2026; delivery December 2027) provides a survival pathway but the bankability of single-tech LDES pure-plays is structurally challenged.

Other relevant developments include Hydrostor compressed-air FID activity, Energy Vault gravity-storage commercial conversion, Antora Energy industrial-heat thermal storage, the broader hyperscaler procurement cohort emerging (Microsoft, Amazon, Meta exploring LDES as 24/7 carbon-free supply for sovereign-AI compute build-outs), the parallel grid-scale BESS buildout setting the sub-10-hour cost benchmark LDES must beat for hybrid co-deployment, and the Wood Mackenzie LDES 2025 outlook revising 2030 capacity forecasts upward.

Competitive Landscape

Form Energy leads with the largest commercial-stage pipeline and Series F capital depth. Energy Dome's CO₂ thermodynamic and hyperscaler partnerships make it the second-most-credible scaled operator. Invinity Energy Systems and ESS Inc anchor flow-battery deployment but face cost-competitiveness pressure. Energy Vault has the largest cumulative gravity-storage pipeline but uneven commercial conversion. The trajectory through 2032 is consolidation favouring iron-air, CO₂, and thermal pathways; flow battery pure-plays face the highest bankability risk.

Key Policies and Regulatory Environment

DOE Long Duration Storage Shot

Department of Energy announced the Long Duration Storage Shot in 2021 with a target of 90% cost reduction by 2030 for storage of more than 10 hours. Funding includes US$349 million for demonstrations, US$100 million for pilots, US$100 million specifically for non-lithium long-duration storage, US$8 million for manufacturing, and US$75 million for the Grid Storage Launchpad at PNNL. The framework anchors US-domestic LDES R&D and commercial scale-up.

California CPUC LDES Procurement Mandate

California Public Utilities Commission ordered procurement of 2 GW of LDES (1 GW 12-hour and 1 GW multi-day duration). Deployment timeline 2031-2037. Combined with California Energy Commission projections of 2-11 GW operational LDES need by 2030 and 37-55 GW by 2045, California is the binding US procurement framework for LDES build-out.

Other relevant frameworks include the IRA Section 48E Clean Electricity Investment Tax Credit (effective 2025-32, 30% ITC for grid-scale storage including LDES), state-level LDES procurement mandates emerging in New York, Massachusetts, and Oregon, the EU Net Zero Industry Act framework for energy storage, and the UK Long Duration Electricity Storage cap-and-floor scheme launched 2024.

Future Outlook

The LDES market in 2032 reaches approximately US$45 billion in annual value with installed long-duration capacity (more than 10 hours) of approximately 65-90 GW versus approximately 4 GW operational today. Iron-air technology dominates first-wave deployment at approximately 35% of 2032 share. CO₂ thermodynamic captures approximately 22%. Vanadium and zinc flow compress to approximately 16% as cost-competitiveness pressure compounds. Thermal storage (Antora, Brenmiller) emerges at approximately 10%.

The competitive landscape consolidates substantially. We expect 2-3 acquisition events among smaller LDES operators by 2028 as scaled buyers (utilities, hyperscalers) demand bankable counterparties. Form Energy, Energy Dome, Hydrostor, and a thermal-storage scale player likely emerge as the top-4 operators by 2030.

The biggest risk is cost-curve underdelivery. DOE Storage Shot 90% by 2030 requires Form Energy iron-air, Energy Dome CO₂, and emerging chemistries to deliver capex-per-kWh that beats natural gas peakers on full-cycle TCO. The leading indicator is the trajectory of 2026-28 first-of-a-kind project economics from Form, Energy Dome, and the next-wave commercial deployments.