Return

What Return does

Return (Return Storage B.V.) is a privately held European independent energy storage provider headquartered in Amsterdam, founded in 2021. The company builds, owns, and operates network-scale battery energy storage systems (BESS) and delivers them to customers under storage-as-a-service contracts. As of late 2025, Return operates 70 MW of BESS, has 500 MW under construction, and a 7 GW development pipeline across the Netherlands, Germany, Belgium, and Spain. Its portfolio includes landmark projects such as Mufasa (364 MW / 1,457 MWh, one of Europe's largest BESS, expected operational 2027), Antares (100 MW / 200 MWh), Castor and Pollux (60 MW / 120 MWh each in Vlissingen), plus Orion and Crown portfolios in Spain and the Rickenbach project in Germany.

The company's core technology is a high-tech energy storage platform that connects geographically dispersed storage assets, providing real-time data on energy availability and demand and enabling multi-use optimization across grid stabilization, renewable integration, and energy market participation. Underlying hardware is sourced from tier-one suppliers—Tesla Megapack 2 XL (Mufasa), CATL EnerOne+ (Brietlingen), Alfen (Antares), and Rolls-Royce Solutions (EPC/O&M). The platform supports intelligent energy flow management to reduce peak loads, improve grid stability, and deploy renewable energy where it provides the greatest economic value.

Return generates revenue through four streams: (1) long-term storage-as-a-service contracts (5-20 years) with utilities, grid operators, energy traders, and industrial consumers, structured as capacity payments and tolling agreements; (2) grid services revenue from frequency regulation, voltage support, and congestion management via energy market participation; (3) Return Industrial Solutions, providing behind-the-grid storage for factories, data centers, and logistics operators; and (4) capacity off-take agreements with energy utilities and large consumers. The company has built a €2 billion contracted revenue backlog anchored by named off-takers including Vattenfall, ENGIE, Eneco, and Essent, and is backed by institutional investors including APG (€300M minority investment, October 2025), Macquarie Capital, TINC, ING, and Triodos Bank.

Name

Return

Legal name

Return Storage B.V.

Website

https://return.energy

Company type

Private

Founded year

2021

Operating status

Operating

Headcount range

101–250 employees

Short description

Return builds, owns, and operates network-scale battery energy storage systems across Europe, delivering storage-as-a-service to utilities, grid operators, energy traders, and large industrial consumers under long-term contracts.

Ownership category

akta.pro rank

Product category

Battery Energy Storage Systems (BESS) / Energy Storage Infrastructure

NAICS

Electric Power Generation (22111)

SIC

Cogeneration Services & Small Power Producers (4991)

akta.pro primary industry

Utility-Scale BESS Project Development & Ownership (IPP/Developer) (EUAFAAAA)

akta.pro secondary industries

BESS Financing, Insurance & Contracting (Tax Equity, PPA/Tolling, Warranties) (EUAFAAAI), BESS Market Participation & Trading Services (Ancillary/Capacity/Arbitrage) (EUAFAAAL), BESS Operations, Maintenance & Asset Performance Management (APM) (EUAFAAAG), Utility-Scale BESS EPC & Integration (EUAEAEAA), BESS EPC, Integration & Commissioning (EUAFAAAB), Energy Storage & Microgrid Electrical Infrastructure (BESS, Controls) (IMAFAHAE)

Keywords

• Battery energy storage
• Grid-scale storage solutions
• Storage-as-a-service
• Renewable energy integration
• Grid stabilization services

Headquarters

HQ city

Amsterdam

HQ country

Netherlands

HQ region

Europe

Offices7 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Storage-as-a-Service (SaaS): Long-term contractual arrangements where Return builds, owns, and operates large-scale BESS and provides access to storage capacity as a service. Customers include utilities, grid operators, energy traders, and industrial consumers who pay for access to storage capacity without CAPEX or operational risk. Revenue is generated through capacity payments, tolling agreements, and market participation.
2. Capacity Off-take Agreements: Long-term contracts (5-20 years) with energy utilities and large consumers for dedicated storage capacity. Customers secure access to flexible storage capacity for portfolio balancing, renewable flow management, and grid congestion relief.
3. Grid Services Revenue: Revenue from providing grid stabilization services including frequency regulation, voltage support, and congestion management. Storage systems participate in energy markets to optimize returns while supporting grid stability.
4. Return Industrial Solutions: Behind-the-grid connection storage solutions for large industrial clients. Services include developing tailored storage systems, reducing grid and energy costs, and providing energy resilience for factories, data centers, and logistics companies.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

Return builds, owns, and operates large-scale Battery Energy Storage Systems (BESS) across Europe and delivers storage-as-a-service to utilities, grid operators, energy traders, and large industrial consumers. Customers access storage capacity without capital expenditure through long-term contractual arrangements (5–30 years), while Return manages site development, financing, construction, and operations. Offerings include a pan-European storage network platform, Return Industrial Solutions (RIS) for behind-the-grid industrial clients, and a portfolio of flagship BESS projects (e.g., Project Mufasa at 364 MW / 1457 MWh).

Product overview

Return is a pan-European independent energy storage provider offering battery storage-as-a-service through a platform model. The core offering is large-scale BESS infrastructure that Return builds, owns, and operates, providing customers access to storage capacity without capital expenditure. Return Industrial Solutions (RIS) extends this capability with behind-the-meter solutions for industrial clients. The project portfolio includes landmark installations such as Project Mufasa (364 MW / 1457 MWh, one of Europe's largest), Antares (100 MW / 200 MWh), Castor and Pollux (60 MW / 120 MWh each, Netherlands flagship projects), Orion and Crown portfolios in Spain, and multiple projects in Germany. The company operates across the Netherlands, Belgium, Germany, and Spain with a 7 GW development pipeline.

Differentiator

Problem solved

Functional benefit

Brands

• Lion Storage: Brand under Return for large-scale battery energy storage system development, including Project Mufasa (364 MW / 1457 MWh)
• Return Industrial Solutions (RIS)
• Project Mufasa

Products and services

• Battery Energy Storage as a Service (BaaS) Return builds, owns, and operates large-scale battery energy storage systems and offers storage capacity as a service. Customers include utilities, grid operators, energy traders, and large industrial consumers who pay for access to storage capacity without CAPEX or operational risk.
• Return Industrial Solutions (RIS) Behind-the-grid connection storage solutions for large businesses and industrial clients with existing grid infrastructure. Optimizes use of existing grid connections, integrates tailored storage systems, mitigates operational impacts of grid congestion, and provides energy resilience.
• Project Mufasa One of Europe's largest BESS projects at 364 MW / 1457 MWh, located in Vlissingen at North Sea Port. Features Tesla Megapack 2 XL technology and €350M+ project financing. Can charge/discharge 1,400 MWh at 350 MW power capacity multiple times daily, sufficient for 200,000+ households.
• Antares 100 MW / 200 MWh BESS in Waddinxveen, Netherlands. First large-scale BESS directly connected to TenneT grid operator. Project investment of €85M. Vattenfall is a capacity off-taker.
• Pollux 60 MW / 120 MWh operational BESS in Vlissingen, Netherlands. Largest operational battery storage system in the Netherlands as of December 2023. Extends Essent's renewable energy portfolio and contributes to Dutch grid stabilization.
• Castor 60 MW / 120 MWh operational BESS in Vlissingen, Netherlands. Second largest operational battery storage system in the Netherlands.
• Star 10 MW / 10 MWh operational BESS in Terneuzen, Netherlands. Return's first energy storage project.
• Sirius 200 MW / 800 MWh BESS in Meeden, Netherlands. First Return project at 220kV extra-high voltage level for grid flexibility.
• Spica 200 MW / 800 MWh BESS in Meeden, Netherlands. Project at 220kV extra-high voltage level for grid flexibility.
• Orion Portfolio 55 MW / 220 MWh portfolio of three DSO-level projects in Vizcaya, Spain (Basque region). First fully tolling-model financed BESS projects in Spain.
• Crown Portfolio 77 MW / 308 MWh portfolio in Spain: 59 MW across two sites in Catalonia and 18 MW at Gijón port in Asturias.
• Brietlingen 13 MW / 29 MWh BESS in Brietlingen, Germany. First Return project in Germany from J&P acquisition. Germany's first BESS project from J&P acquisition.

Quantifiable outcome

• 70 MW operational storage can power 175,000 European homes
• +4 more outcomes

Named customers5 records

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

17 partnerships are on record, tiered core, strategic and minor.

• Aquila Clean EnergycoreStrategic or Co-development Partner · 1 March 2026Aquila Clean Energy sold an 80 MW/318 MWh ready-to-build BESS portfolio in Catalonia and Asturias, Spain to Return. Described as Spain's first utility-scale BESS portfolio sale, supporting grid stability and renewable integration.
• ENGIEcoreStrategic or Co-development Partner · 1 February 2026French utility ENGIE partnered with Return to purchase 100 MW of battery energy storage through a virtual flexibility purchase agreement (vFPA) in Germany, effective from 2027. Described as the largest such fixed-price agreement in Europe, supporting grid stability and renewable integration.
• MovaresstrategicImplementation/ SI/ Consulting Partner · 1 December 2025Framework agreement with Dutch engineering consultancy Movares to accelerate grid connection development for Return's storage pipeline in Netherlands. Focus on route engineering and permitting for Ursa and Mizar cable-connection facilities.
• BESSMARTcoreStrategic or Co-development Partner · 1 September 2025Partnership with Berlin-based BESSMART to acquire four strategic battery storage locations in Eastern Germany totaling 310 MW and 670 MWh. Sites in Brandenburg, Saxony-Anhalt, and Saxony at key 110kV grid points, with commercial operation from 2027. BESSMART brings development, construction, and operating expertise.
• TeslacoreTechnology or Integration · 1 April 2025Tesla provides Megapack 2 XL battery systems for Mufasa project under a comprehensive EPC agreement. Tesla's energy storage systems will charge and discharge 1,400 MWh at 350 MW power capacity multiple times daily.
• EnecocoreStrategic or Co-development Partner · 1 February 2025Dutch energy company Eneco partnered with Return for Mufasa project operations optimization. As market leader in battery operations and pioneer of revenue index models, Eneco optimizes Mufasa's 364 MW/1457 MWh operations daily.
• Benbros EnergycoreStrategic or Co-development Partner · 1 September 2024Joint venture with Benbros Energy to develop over 500 MW in storage projects in Spain. Initial package of 210 MW across 10 projects well advanced in development. Supports Return's expansion in Spanish market alongside subsidiary Ekhi.
• J&P Batterie Projekte (acquired)coreStrategic or Co-development Partner · 1 September 2024Return acquired majority stake in Hamburg-based J&P Batterie Projekte with €50M investment and commitment. J&P brings pipeline of over 4 GW of storage projects and established German market presence through SemperPower platform.
• VattenfallcoreChannel Partner/ Reseller/ DistributorVattenfall is a capacity off-taker for Antares project, utilizing part of the 100 MW/200 MWh storage capacity and integrating it into their existing energy portfolio.
• AlfenstrategicTechnology or IntegrationAlfen serves as facility partner for technical execution of Antares project and installed Pollux battery storage system. Provides expertise in energy storage system integration.
• SPIE NederlandstrategicImplementation/ SI/ Consulting PartnerSPIE Nederland serves as facility partner for technical execution and scope delivery of Antares project.
• CATLstrategicTechnology or IntegrationCATL provides EnerOne+ battery systems for Brietlingen project, leveraging Chinese battery technology expertise for European storage deployment.
• Rolls-Royce SolutionsstrategicImplementation/ SI/ Consulting PartnerRolls-Royce Solutions serves as EPC and O&M provider for Brietlingen project with long-term performance guarantee. Previously installed Castor BESS for Return.
• OntierminorImplementation/ SI/ Consulting PartnerOntier acted as legal advisor to Return Energy for the 318 MWh BESS acquisition from Aquila Clean Energy in Spain.
• TenneTcoreChannel Partner/ Reseller/ DistributorDutch transmission system operator. Antares is the first active large-scale BESS in Netherlands directly connected to TenneT, playing pivotal role in enhancing grid flexibility and renewable integration.
• 50HertzcoreChannel Partner/ Reseller/ DistributorGerman transmission system operator. BESSMART partnership sites deliver critical flexibility during peak generation and system stability during demand peaks for 50Hertz.
• Grid Operators (Stedin, Liander, Enexis, Elia, Amprion, Enedis)coreChannel Partner/ Reseller/ DistributorPartnership network with European TSOs and DSOs for grid connection and storage integration. Supports Return's strategic site selection and project development across Netherlands, Belgium, and Germany.

Scale indicators7 records

Recent moves7 records

Expansion highlights6 records

Emerging players

• BESSMART: Berlin-based BESS developer that partnered with Return to acquire four storage sites in Eastern Germany (310 MW/670 MWh). Emerging player in German market with development and operational expertise relevant to Return's expansion.
• Energy Vault: Swiss-listed energy storage company developing gravity-based and battery storage solutions. Emerging player in utility-scale storage with overlapping customer segments and European focus, though differentiated technology.

Broad incumbents

• Engie: French multinational utility with growing BESS development portfolio and 100 MW vFPA partner with Return. Overlaps as both customer and competitor in utility-scale storage development across European markets.
• EnBW: German utility with active battery storage development in Baden-Württemberg and other German regions. Broad incumbent operating in the same German market as Return's German subsidiary (J&P Batterie Projekte).
• Tesla Energy: Megapack OEM and IPP through Tesla Energy. Currently a technology supplier for Return's Mufasa project (Tesla Megapack 2 XL), but increasingly developing and owning storage projects directly, making Tesla a key competitive force.
• Statkraft: Norwegian state-owned utility and Europe's largest renewable energy generator, actively developing BESS assets. Broad incumbent offering grid flexibility services in similar geographies to Return.
• RWE: German multinational utility with significant BESS pipeline in Germany and Europe. Broad incumbent operating across generation, storage, and grid services, with overlapping customer base to Return's German operations.

Direct peers

• Fluence Energy: Global market leader in utility-scale battery energy storage with both IPP/developer and technology provider business models. Most direct comparable to Return's build-own-operate BESS platform, serving utilities and grid operators across multiple geographies including Europe.
• Alfen: Dutch energy solutions company providing battery storage systems, EV charging, and grid equipment. Direct peer serving similar European utility and industrial customers; actually a technology partner on Return's Antares project.
• Wärtsilä Energy Storage: Finland-based energy storage integrator and IPP with GridSolv and Quantum product lines. Directly comparable as a European-headquartered BESS developer-owner-operator serving utilities and grid operators.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/returnenergy

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 records

Subsidiaries4 records

Funding overview

Funding rounds3 records

Investors8 records

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

M&A1 record

Investments

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

Frequently asked questions about Return