Energiesysteme Groß

What Energiesysteme Groß does

Energiesysteme Groß (ESG) is a German turnkey solar energy provider founded in 2016 by Björn Groß and headquartered in Niestetal near Kassel. The company plans, installs, and services photovoltaic systems spanning small residential rooftop installations (1 kWp) through commercial and industrial arrays to multi-megawatt ground-mounted solar parks. Beyond core PV, ESG delivers commercial battery storage systems (Gewerbespeicher) and EV charging infrastructure, including a Megawatt-Ladepark featuring Megawatt Charging System (MCS) technology at up to 1,000 kW for electric heavy-duty trucks, paired with ~2.1 MWp of on-site solar generation and a 1,000 kWh battery buffer.

ESG's revenue model is multi-stream: one-time hardware sales and installation fees for PV systems (residential to utility-scale), project development fees and equity returns from ground-mounted solar parks operated through project companies, recurring operations and maintenance services (Technische Betriebsführung, Solarreinigung), and PPA-based electricity offtake revenue (e.g., the 5.75 MWp Solarpark Niederhone with SMA Solar Technology AG and the 71 MW Merbitz park with a 10-year Salzgitter AG PPA). Customer acquisition runs through nine regional Solarzentren offering face-to-face consultation, supplemented by an online inquiry/contact funnel on esg-solar.de.

ESG employs over 90 staff including in-house engineers, planners, technicians, project and construction managers, and service teams, distributed across headquarters and nine Solarzentren in Nordhessen, Ostwestfalen, Südniedersachsen, Elbe/Weser, Rhön, Werra-Meißner, Braunschweig/Harz, Hannover/Hildesheim, and Osnabrück. Key enterprise customers include SMA Solar Technology AG, Salzgitter AG (via the SALCOS low-CO2 steelmaking program), and Rudolph Logistik. ESG has been climate-neutral since 2021 (Corporate Carbon Footprint certified) and is a signatory of the bne "Gute Planung" self-commitment for biodiversity-integrated solar park design, with the Solarpark Niederhone biodiversity concept winning the Hessischer Staatspreis Energie 2024.

Name

Energiesysteme Groß

Legal name

Energiesysteme Groß GmbH & Co. KG

Website

https://esg-solar.de

Company type

Private

Founded year

2016

Operating status

Operating

Headcount range

51–100 employees

Short description

Energiesysteme Groß is a German turnkey solar EPC and operator that plans, installs, and services photovoltaic systems, commercial battery storage, and EV charging infrastructure — including a megawatt-class electric truck charging park — for residential, agricultural, commercial, and industrial customers across Germany.

Ownership category

akta.pro rank

Product category

Solar Energy Installation and Energy Storage

NAICS

Solar Electric Power Generation (221114)

SIC

Electric Services (4911)

akta.pro primary industry

Solar EPC & Construction (Utility-Scale, Rooftop, Balance of System) (EUAMABAB)

akta.pro secondary industries

Solar PV Power Plant EPC (Utility-Scale) (EUAEAAAG), PV Balance of System (BOS) & Electrical Infrastructure (Inverters, Transformers, Cabling, Substations) (EUACAGAC), Solar Mounting, Racking & Trackers (Fixed-Tilt, Single/Dual-Axis, Rooftop Mounts) (EUAMABAF), EV Charging as DER (Managed Charging, V2G/V2B) (EUAMAJAL)

Keywords

• Photovoltaic installation
• Solar energy systems
• Battery storage solutions
• EV charging infrastructure
• Commercial solar projects

Headquarters

HQ city

Kassel

HQ country

Germany

HQ region

Europe

Offices10 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. Photovoltaik-Anlagen (Hardware Sales): Sale of complete turnkey PV systems including modules, inverters, mounting systems, and battery storage. Revenue is generated from project-based one-time hardware and installation fees, ranging from small residential systems to large industrial and utility-scale projects (Freiflächenparks) in the megawatt range.
2. Service und Wartung (Operations & Maintenance): Optional comprehensive service and maintenance for PV installations post-commissioning, including technical operations management (Technische Betriebsführung), solar cleaning (Solarreinigung), and ongoing system monitoring.
3. Energiemanagement- und Stromvermarktungskonzepte: Customer-individual energy management and electricity marketing concepts, including bilateral Power Purchase Agreements (PPAs) where ESG or its project companies supply solar electricity directly to industrial off-takers. Revenue may derive from electricity sales under PPA structures.
4. Projektentwicklung Freiflächen-PV: Development of large-scale ground-mounted solar projects (Solarparks) as investor or co-investor, often through project companies (e.g., IG Merbitz Solar GmbH) with long-term PPA offtake agreements. Revenue may derive from project development fees, equity returns, or electricity sales.

Pricing tiers

Go-to-market motion2 records

Distribution channels5 records

Marketing channels8 records

Core offering

Energiesysteme Groß plans, installs, and maintains turnkey photovoltaic (PV) systems, battery energy storage systems, and EV charging infrastructure for residential, commercial, industrial, agricultural, and utility-scale customers. Offerings range from small residential rooftop installations (kW scale) to multi-megawatt ground-mounted solar parks, including commercial battery storage for self-consumption optimization and load management, as well as EV charging solutions spanning residential wallboxes to a megawatt-scale charging park for electric heavy-duty trucks. The company delivers integrated solar-storage-charging energy concepts, optional ongoing technical operations management and maintenance, and bilateral Power Purchase Agreements (PPAs) for industrial green electricity supply.

Product overview

Energiesysteme Groß offers a comprehensive portfolio of solar energy solutions built around a core offering of turnkey photovoltaic (PV) systems. Their product range spans from residential rooftop installations to large-scale commercial/industrial systems and utility-scale solar farms. The portfolio includes PV modules, commercial battery storage systems for optimizing self-consumption, and EV charging infrastructure ranging from residential/commercial wallboxes to megawatt-scale charging parks for electric trucks. Supporting components include inverters (SMA and Sungrow brands) and mounting systems. The company also provides technical operations management and solar cleaning services. Their solar zone centers across Germany serve as local points of contact for project planning and installation.

Differentiator

Problem solved

Functional benefit

Brands

• ESG Solar: Primary brand for photovoltaic and energy solutions
• Solarzentren (Solar Centers)

Products and services

• Photovoltaik-Anlagen (PV Systems) Turnkey photovoltaic systems for residential rooftops, commercial and industrial buildings, agricultural buildings, and ground-mounted solar parks, ranging from kW-scale residential to multi-MW utility-scale installations. Includes modules, mounting systems, inverters (SMA Sunny Highpower PEAK3, Sungrow), and full planning, construction, and commissioning services.
• Gewerbespeicher / Batteriespeichersysteme Commercial and industrial battery energy storage systems for storing excess solar energy, optimizing self-consumption, peak shaving, and load management. Available from residential through large-scale grid-level applications.
• Ladeinfrastruktur (EV Charging Infrastructure) incl. Megawatt-Ladepark EV charging infrastructure including wallboxes for residential and commercial use, high-speed charging for passenger vehicles, and Megawatt Charging System (MCS) for electric heavy-duty trucks. The Niestetal Megawatt-Ladepark combines on-site solar (approx. 2.1 MWp), battery storage (1,000 kWh), and grid connection to deliver MCS at up to 1,000 kW with ~45-minute full-charge time.
• Technische Betriebsführung (Technical Operations Management) Optional post-commissioning technical operations management service for PV installations including monitoring, performance optimization, and maintenance.
• Solarreinigung (Solar Cleaning) Professional cleaning services for solar installations to maintain optimal energy yield and equipment longevity.
• Freiflächen-PV Projektentwicklung (Utility-Scale Solar Park Development) Development and co-investment in large-scale ground-mounted solar parks (Freiflächen-PV) ranging from several MW to 70+ MW, often paired with biodiversity integration and bilateral Power Purchase Agreements (PPAs) for industrial offtakers. Delivered via dedicated project companies such as IG Merbitz Solar GmbH.

Quantifiable outcome

• 137 MW installed in 5 years, enough to supply ~39,143 households
• +8 more outcomes

Named customers9 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Eight partnerships are on record, tiered minor and core.

• Land Hessen (Landesinitiative 'Strom bewegt')minorOthers · 1 June 2026The construction of the Megawatt charging park in Niestetal was funded by the State of Hesse (Land Hessen) under the 'Strom bewegt' (Power Moves) initiative, a state-level program supporting electric mobility infrastructure.
• Rudolph LogistikcoreStrategic or Co-development Partner · 31 October 2025Rudolph Logistik conducted a real-world test of ESG's Megawatt charging park in Niestetal using an Iveco S-eWay electric truck. The test validated ESG's charging infrastructure for heavy-duty electric logistics vehicles. Rudolph Logistik operates the transport route between SMA's production and logistics sites.
• IG Merbitz Solar GmbHcoreStrategic or Co-development Partner · 7 March 2024IG Merbitz Solar GmbH is a joint project company (50/50) of ESG and Wettin-Löbejün Solar GmbH & Co.KG for the development and operation of the Merbitz solar park (71 MW). The project is co-developed with Agrarbetrieb Gut Merbitz GbR (ecological farming operation). ESG serves as the development partner providing EPC and O&M services.
• Salzgitter AG (Salzgitter Flachstahl GmbH)coreStrategic or Co-development Partner · 7 March 2024Salzgitter AG (specifically Salzgitter Flachstahl GmbH) signed a 10-year PPA with IG Merbitz Solar GmbH for ~71 MWh/year of green electricity from the Merbitz solar park. The electricity will support the SALCOS (Salzgitter Low CO2 Steelmaking) program for near CO2-free steel production. ESG is a co-developer of the project through IG Merbitz Solar GmbH.
• SMA Solar Technology AGcoreStrategic or Co-development Partner · 23 January 2023ESG and SMA signed a bilateral Power Purchase Agreement (PPA) for the Solarpark Niederhone (5.75 MWp). SMA purchases the solar electricity produced at the park to supply approximately one-third of its headquarters electricity needs in Niestetal. The PPA is long-term and operates outside the EEG (Renewable Energy Sources Act), making it completely subsidy-free.
• first-energyminorStrategic or Co-development PartnerFirst-energy supported ESG in calculating its Corporate Carbon Footprint and in the carbon offset process for achieving and maintaining climate neutrality since 2021. Supported the offset of ~252 t CO2 for 2022.
• South Pole (Kariba REDD+ Waldschutz)minorOthersESG offsets ~153 t CO2 through the South Pole Kariba REDD+ forest protection project in Zimbabwe, which protects ~785,000 ha of forest and supports local community development programs including clinics and school subsidies.
• UpEnergy (Uganda Biomass Cookstove Project)minorOthersESG offsets ~100 t CO2 through UpEnergy's Uganda Biomass Cookstove Project, which provides energy-efficient cooking stoves to low-income families in Uganda, reducing deforestation caused by open-fire cooking.

Scale indicators10 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Zolar: Berlin-based online solar platform and installer connecting end customers with regional installation partners. Comparable to ESG on digital-led residential PV lead generation plus installation fulfillment in Germany.
• Enerix: German regional solar franchise installing PV and storage for residential and commercial customers. Comparable to ESG on regional-center-driven sales and turnkey PV + battery storage delivery.
• Enpal: Berlin-based German market leader in residential and small commercial solar leasing/PV-as-a-service. Closely comparable to ESG on turnkey residential PV, battery storage bundling, and a sales-led direct-to-customer model in Germany.
• BELECTRIC: German utility-scale solar EPC and O&M provider. Closely comparable to ESG's Freiflächen (utility-scale ground-mounted solar park) business, including large-MW project development and PPA structuring.
• IBC Solar: German PV system integrator and wholesaler offering turnkey solar solutions from residential to utility-scale. Comparable to ESG on full-spectrum PV EPC plus storage and project development in the German market.
• 1Komma5° (1point5 Degrees): Hamburg-based fast-scaling German installer offering integrated PV, heat pumps, EV charging, and energy management. Highly comparable to ESG on turnkey solar + storage + EV charging bundling and German residential/C&I customer focus.

Broad incumbents

• EnBW: Large German utility with significant utility-scale renewables, EV fast-charging, and residential solar offerings via subsidiaries. Comparable to ESG across solar EPC, storage, and EV charging but at far larger scale.
• Solarwatt: Established Dresden-based German PV glass-module manufacturer that also delivers turnkey PV and storage systems. Comparable to ESG on residential/C&I solar-plus-storage but with broader product breadth and longer track record.

Emerging players

• Milence: European joint venture (Volvo, Daimler Truck, Traton) building public high-power charging for heavy-duty trucks, including MCS sites. Comparable to ESG on the Megawatt-Ladepark / E-Lkw MCS angle, though as a public-network operator rather than a depot/integrated-energy operator.

Others

• SMA Solar Technology: German inverter and power electronics manufacturer and a strategic PPA customer of ESG (Solarpark Niederhone). Adjacent enabling player whose products ESG installs and whose solar park offtake reflects ESG's ability to serve major industrial customers.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/@EnergiesystemeGross
• LinkedInlinkedin.com/company/energiesysteme-gross
• Facebookfacebook.com/energiesystemegross

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

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 Energiesysteme Groß