Cumulus Energy Storage

What Cumulus Energy Storage does

Cumulus Energy Storage is a privately held UK company founded in 2012, headquartered in Rotherham (South Yorkshire) at the Advanced Manufacturing Park, with additional commercial offices in Moraga, California (Cumulus Energy Storage Inc) and Meerbusch, Germany (Cumulus Energy Storage GmbH). It is developing a bipolar rechargeable Copper-Zinc battery for grid-level stationary energy storage, based on a patented system using an ionically permeable separator that adapts industrial Copper and Zinc electrowinning processes (operating at roughly 100 MWh equivalent scale in mining for decades) into a rechargeable architecture. The technology is positioned for 4-12 hour charge/discharge cycles, a 30-year planned lifecycle, >80% round trip efficiency, 98% availability, and 99.5% end-of-life recyclability, with Copper and Zinc sourced from abundant raw materials.

The company targets three customer segments: Commercial Renewables (time-shifting solar and wind generation, addressing issues such as the over £307m in UK wind curtailment payments in 2023), Infrastructure (security of supply for transmission and distribution, micro-grids, EV recharging), and Electricity Intensive Industries (displacing diesel gensets in mining and remote sites, lowering energy costs). Its go-to-market is a B2B channel-partner model, with products and services delivered through local project developers and potential licensees, supported by global component manufacturers and planned continental-level forming and assembly plants. The firm is pre-revenue, with 1-10 employees, patent grants across 15 countries plus pending international filings, UK government financial support, and reinvesting business angel backing, and is moving from pilot line production toward full production capacity.

Name

Cumulus Energy Storage

Legal name

Cumulus Energy Storage Ltd

Website

https://cumulusenergystorage.com

Company type

Private

Founded year

2012

Operating status

Operating

Headcount range

1–10 employees

Short description

Cumulus Energy Storage is a privately held UK developer of a patented bipolar rechargeable Copper-Zinc battery for grid-level stationary energy storage. It targets utilities, renewable energy developers, grid infrastructure operators, and electricity-intensive industries across the UK, US, and Germany.

Ownership category

akta.pro rank

Product category

Grid-Scale Energy Storage Batteries

NAICS

Battery Manufacturing (335910)

SIC

Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

Battery Modules & Packs (Industrial/Commercial pack assembly) (IMAGAHAB)

akta.pro secondary industries

Electrochemical LDES (Flow Batteries & Other Long-Duration Batteries) (EUAFADAA), Battery Pack Manufacturing & Module Assembly (EUAFABAI), Battery Cells (Li-ion, LFP, Sodium-ion, Lead-acid, NiMH) (IMAGAHAA)

Keywords

• Grid-level energy storage
• Copper-zinc batteries
• Stationary battery storage
• Bipolar rechargeable batteries
• Renewable energy storage

Headquarters

HQ city

Rotherham

HQ country

United Kingdom

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Technology or R&D, Operations, Personnel, Infrastructure, Marketing or Sales

Revenue model

1. Grid-level energy storage battery sales: Sale of super-storage products and services to customers through local project developers. The company plans to build pilot line production followed by full production capacity.

Go-to-market motion2 records

Distribution channels2 records

Marketing channels4 records

Core offering

Cumulus Energy Storage develops and manufactures grid-level stationary energy storage batteries based on a patented bipolar rechargeable Copper-Zinc chemistry. The company sells its super-storage battery systems through local project developers and licensed manufacturing partners, targeting commercial renewables, infrastructure operators, and electricity-intensive industries with 4-12 hour charge/discharge duration systems. The company is in development stage with pilot line production planned, followed by full production capacity.

Product overview

Cumulus Energy Storage offers a single core product: the Copper-Zinc battery, a grid-scale rechargeable battery technology. This battery technology serves three target markets: Commercial Renewables (generation time-shifting), Infrastructure (security of supply including off-grid and micro-grids), and Electricity Intensive Industries (energy management and diesel generator replacement). The company provides super-storage products and services to customers through local project developers.

Differentiator

Problem solved

Functional benefit

Products and services

• Copper-Zinc Grid-Level Energy Storage Battery A patented bipolar rechargeable Copper-Zinc battery for stationary grid-scale energy storage, using an ionically permeable separator to enable rechargeability. Delivers 4-12 hour charge/discharge cycles, greater than 80% round trip efficiency, 98% availability, a planned 30-year lifecycle, and 99.5% recyclability at end of life. Designed for utility-scale and industrial customers including commercial renewables operators, grid infrastructure operators, and electricity-intensive industries.

Quantifiable outcome

• 98% availability through reliable battery chemistry and ease of maintenance
• +3 more outcomes

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Two partnerships are on record, tiered major.

• Global component manufacturersmajorTechnology or IntegrationGlobal component manufacturers supporting production. The company will deliver super-storage products and services through local project developers.
• Continental-level forming and assembly plantsmajorStrategic or Co-development PartnerPlans for continental-level forming and assembly plants to support global manufacturing and distribution.

Scale indicators3 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• ESS Inc. ESS Inc. manufactures iron flow batteries for long-duration grid-scale energy storage, directly competing with Cumulus in the 4-12 hour stationary storage segment using a non-lithium, abundant-materials chemistry approach.
• Invinity Energy Systems: Invinity produces vanadium flow batteries for commercial and utility-scale long-duration storage, making it a direct competitor in non-lithium electrochemical grid storage with similar use-case targeting to Cumulus.
• Form Energy: Form Energy is developing iron-air batteries for 100+ hour grid storage, competing in the same long-duration electrochemical storage category as Cumulus with similarly abundant, low-cost materials and a multi-day discharge profile.
• Highview Power: Highview Power develops liquid air energy storage for long-duration grid applications, directly competing with Cumulus in the long-duration stationary storage market targeting 4+ hour discharge durations for utility and industrial customers.
• Energy Vault: Energy Vault develops gravity-based and hybrid long-duration energy storage systems for grid-scale applications, competing in the same LDES market segment as Cumulus with utility and renewable developer customers.

Broad incumbents

• Tesla Energy: Tesla's Megapack is the dominant utility-scale lithium-ion BESS product globally. While not a direct Cu-Zn competitor, Tesla represents the incumbent that Cumulus must displace on cost and longevity to win grid storage market share.
• Fluence Energy: Fluence is a major global battery energy storage system integrator and solutions provider with utility-scale deployments. It competes with Cumulus for the same utility and renewable developer customers in grid-scale storage projects.
• Saft (TotalEnergies): Saft is an established industrial battery manufacturer specializing in advanced storage solutions for energy, transportation, and industrial markets, making it a broad incumbent competitor in grid-scale and stationary storage.

Emerging players

• EnerVenue: EnerVenue develops nickel-hydrogen batteries for stationary energy storage, emerging as an alternative-chemistry competitor to Cumulus in the long-duration grid storage space with similar claims of long lifecycle and low LCOS.
• Antora Energy: Antora Energy develops thermal carbon block energy storage for industrial and grid applications, an emerging competitor in the long-duration storage category targeting industrial heat and electricity customers similar to Cumulus's electricity-intensive industries segment.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/CumulusEnergy
• LinkedInlinkedin.com/company/cumulus-energy-storage

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds1 record

Investors1 record

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Cumulus Energy Storage