C4 Energy
C4 Energie GmbH is a privately held Kiel-based operator that develops, finances, and runs biogas and biomass plants across Germany, selling renewable electricity, district heat, and biomethane to utilities, municipalities, and gas grid operators under EEG feed-in tariffs.
- Company typePrivate
- Founded2004
- HeadquartersKiel, Germany
- Headcount11–50
- GTM typeB2B
- OfferingServices
What C4 Energy does
C4 Energie GmbH is a privately held German renewable energy operator headquartered in Kiel that develops, finances, and operates biogas and biomass energy facilities. Founded on 29 July 2004 as Biogas Bobitz Verwaltungs GmbH, the company has grown from a single plant in Bobitz to a portfolio of more than ten operational biogas facilities across Schleswig-Holstein, Mecklenburg-Vorpommern, Lower Saxony, and Hesse, including sites at Bobitz, Bergen auf Rügen, Rambin, Itzstedt, Hardegsen, Altenstadt, Süderholz-Grabow, and Bilshausen. Each plant is held through a dedicated GmbH & Co. KG subsidiary. The company describes itself as a technology operator combining ecological responsibility with economic efficiency, with a 203 million kWh annual combined output of gas, electricity, and heat. The Bergen auf Rügen facility alone serves over 2,000 households and is credited with saving approximately 5,600 tonnes of CO2 per year.
The company's core technology is anaerobic digestion of agricultural biomass (including maize silage and cattle manure) into biogas, which is then routed to (a) combined-heat-and-power units for electricity generation and district heating, and (b) biomethane upgrading and injection into the natural gas grid. Each of these pathways represents a distinct revenue stream, with electricity sold to grid operators under Germany's Renewable Energy Sources Act (EEG) framework on 20-year guaranteed feed-in tariffs, heat sold to nearby municipalities, residential developments, and institutional customers (including Forschungszentrum Borstel) via micro-gas networks and district heating systems, and biomethane sold through gas grid injection. The company maintains a cross-plant energy efficiency improvement program in operation since 2013.
Its go-to-market is exclusively B2B and structured around long-term offtake partnerships with major German utilities and gas grid operators — notably E.ON edis, E.ON Mitte AG, and EnergieNetz Mitte GmbH — for electricity and biomethane sales, and direct district-heating supply contracts for heat sales. E.ON Mitte is also a co-development partner and joint venture partner (Altenstadt C4 Energie GmbH & Co. KG) and made an early-stage investment of approximately €1.9 million in pilot projects. The managing directors are Michail Dotsikas and Otto R. Eichhorn. This entity is distinct from the Nutrabolt-owned 'C4 Energy' consumer energy-drink brand, which appears in the source data but is not the subject of this analysis.
C4 Energy firmographics
Firmographics- Name
- C4 Energy
- Legal name
- C4 Energie GmbH
- Website
- https://c4energie.de
- Company type
- Private
- Founded year
- 2004
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- C4 Energie GmbH is a privately held Kiel-based operator that develops, finances, and runs biogas and biomass plants across Germany, selling renewable electricity, district heat, and biomethane to utilities, municipalities, and gas grid operators under EEG feed-in tariffs.
- Ownership category
- akta.pro rank
C4 Energy industry classification
Industry- Product category
- Renewable Energy Production
- NAICS
- Biomass Electric Power Generation (221117), Electric Power Generation (22111)
- SIC
- Cogeneration Services & Small Power Producers (4991), Electric Services (4911), Natural Gas Transmisison & Distribution (4923), Electric, Gas & Sanitary Services (4900)
- akta.pro primary industry
- Biogas/RNG Plant Development, EPC & Project Delivery (EUAAAEAH)
- akta.pro secondary industries
- Forestry & Wood Waste Biomass Power (Sawmill Residues, Black Liquor) (EUACAIAG), Digestate Processing, Nutrient Recovery & Fertilizer Products (Struvite, Ammonia, Compost) (EUAAAEAL)
Keywords
Where C4 Energy is headquartered
LocationHeadquarters
- HQ city
- Kiel
- HQ country
- Germany
- HQ region
- Europe
Offices7 records
Markets served
C4 Energy business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Supply Chain, Operations, Infrastructure, Personnel, Technology or R&D, Marketing or Sales
Revenue model
- Electricity Sales: Production and sale of electricity generated from biogas and biomass to the public power grid
- Heat Sales: Sale of thermal energy produced from biogas facilities to nearby residential and commercial customers
- Biogas/Gas Grid Injection: Production of biomethane for injection into natural gas grids, generating revenue through gas sales
Distribution channels1 record
Marketing channels3 records
C4 Energy product offering
Product offeringCore offering
C4 Energie GmbH develops, finances, and operates biogas and biomass energy plants that produce renewable electricity, heat, and biomethane. The company operates multiple facilities across Germany, feeding electricity directly into the public power grid via long-term contracts with utilities such as E.ON edis, E.ON Mitte, and EnergieNetz Mitte, injecting processed biomethane into natural gas grids, and supplying district heating to municipalities, residential developments, and institutional customers.
Product overview
C4 Energy is a brand under Nutrabolt that produces energy drinks and supplements. The product portfolio includes core C4 Energy drinks, the new C4 Performance Energy Shots (entry into the energy shot category with 200mg caffeine, zero sugar, NSF Certified for Sport), and limited-edition collaborations like C4 Ultimate Energy x Godzilla. The brand also engages in athlete endorsement partnerships with figures like NBA player Josh Hart and WWE star Jey Uso to drive brand visibility across sports entertainment.
Differentiator
Problem solved
Functional benefit
Products and services
- Biogas Plant Bobitz Original biogas facility producing electricity and district heating from maize and cattle manure, supplying approximately 350 households.
- Biogas Plant Bergen auf Rügen Biogas facility producing electricity and heat for the Bergen auf Rügen region, serving more than 2,000 households.
- Biogas Plant Hardegsen Biogas and biomethane production facility with biomethane injection into the Erdgasnetz Mitte natural gas grid, developed in partnership with EAM.
- Biogas Plant Itzstedt Biogas facility producing electricity and supplying renewable heat to Forschungszentrum Borstel research center via a dedicated micro-gas network pipeline.
- Biogas Plant Altenstadt Biogas facility with gas injection capability, developed in cooperation with E.ON Mitte AG as a joint venture (Altenstadt C4 Energie GmbH & Co. KG).
- Biogas Plant Süderholz-Grabow Acquired biogas facility with 625 kWel capacity, producing electricity and district heating for the Süderholz-Grabow area.
- Biogas Plant Bilshausen Acquired biogas facility near the existing Hardegsen plant, jointly operated for production efficiency.
- Biogas Plant Rambin Biogas plant on Rügen island connected via a 17 km biogas pipeline to the local gas distribution network.
Quantifiable outcome
- Approximately 5,600 tonnes of CO2 saved annually at Bergen auf Rügen facility
- +2 more outcomes
Companies that use C4 Energy
Customer profileSegments3 records
Ideal customer profiles3 records
C4 Energy technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature1 record
C4 Energy partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- E.ON Mitte AGcoreMajor co-development partner for multiple biogas facilities including Hardegsen and Altenstadt. E.ON Mitte and C4 Energie formed a joint venture (Altenstadt C4 Energie GmbH & Co. KG) for the Altenstadt project. Partnership began with Hardegsen facility in 2008 as a pilot project for biogas injection into the natural gas grid. E.ON Mitte invested approximately 1.9 million euros in early projects.
Scale indicators3 records
Recent moves6 records
Expansion highlights3 records
C4 Energy competitors and assessment
Company assessmentBroad incumbents
- Verbio AG: German listed biofuel and biomethane producer. Operates larger-scale biomethane upgrading and gas injection plants across Germany, competing for offtake contracts with the same utilities C4 Energie serves.
- E.ON Bioerdgas: Biomethane arm of E.ON, one of C4 Energie's key partners and offtakers. Operates a much larger biomethane and biogas portfolio as part of E.ON's diversified utility business, but overlaps directly with C4 Energie's grid-injection product.
Direct peers
- PlanET Biogas Group: German mid-sized biogas EPC and plant operator with an installed base of anaerobic digestion plants in Germany and internationally. Direct competitor for new build and operation of medium-scale biogas facilities.
- Weltec Biopower GmbH: German manufacturer and operator of biogas plants with focus on agricultural substrates. Comparable to C4 Energie in feedstock profile (maize, manure) and EEG-anchored business model.
- MT-Energie GmbH: German manufacturer and operator of biogas and biomethane upgrading plants. Direct competitor for biomethane-to-grid projects of comparable scale to C4 Energie's Hardegsen and Altenstadt facilities.
- GreenGas Deutschland GmbH: Specialist biomethane gas-grid injection operator in Germany. Competes with C4 Energie's grid-injection assets for biomethane offtake volumes and for the same E.ON/Mitte gas network contracts.
- EnviTec Biogas AG: German-based developer, builder, and operator of biogas and biomethane plants across Europe. EnviTec is a direct competitor to C4 Energie in the German biogas EPC and operating market, serving the same utility and heat customers.
- Schmack Biogas (Eisenmann SE): One of the largest German biogas plant builders and operators, historically comparable in scale and plant portfolio to C4 Energie. Both companies sell electricity under EEG tariffs and operate district heat networks.
Emerging players
- Stadtwerke (various municipal utilities): Many German municipal utilities (Stadtwerke) own and operate district heating networks and have begun acquiring or building biogas/biomass heat plants. They are both competitors (in municipal heat) and customers (electricity offtakers) for C4 Energie.
- Bebra Biogas GmbH: Regional German biogas plant developer and operator in Hesse and Thuringia. Comparable mid-sized footprint to C4 Energie and serves overlapping municipal heat and utility customers.
Market position
Strengths4 records
Weaknesses5 records
Competitive moat4 records
Key risks6 records
Key highlights6 records
Customer concentration
C4 Energy social profiles
Digital presenceC4 Energy compliance and trust
Trust signalCompliance1 record
C4 Energy financial estimates
Financial estimateRevenue estimate
Valuation estimate
C4 Energy leadership team
Management profileNumber of profiles
Profiles2 records
C4 Energy subsidiaries and ownership
Company hierarchySubsidiaries5 records
C4 Energy funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
C4 Energy M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about C4 Energy
What does C4 Energy do?
C4 Energie GmbH develops, finances, and operates biogas and biomass energy plants that produce renewable electricity, heat, and biomethane. The company operates multiple facilities across Germany, feeding electricity directly into the public power grid via long-term contracts with utilities such as E.ON edis, E.ON Mitte, and EnergieNetz Mitte, injecting processed biomethane into natural gas grids, and supplying district heating to municipalities, residential developments, and institutional customers.
Is C4 Energy a public or private company?
C4 Energy is a private company. It is classified as unknown and is currently operating.
When was C4 Energy founded?
C4 Energy was founded in 2004. It employs 11 to 50 people.
Where is C4 Energy based?
C4 Energy is headquartered in Kiel, Germany, in the Europe region.
How does C4 Energy make money?
Three revenue lines are on record. Electricity Sales are the primary driver. The others are heat Sales and biogas/Gas Grid Injection.
Who are C4 Energy's main competitors?
Broad incumbents on record are Verbio AG and E.ON Bioerdgas. Direct peers are PlanET Biogas Group, Weltec Biopower GmbH, MT-Energie GmbH, GreenGas Deutschland GmbH, EnviTec Biogas AG and Schmack Biogas (Eisenmann SE). Emerging players are Stadtwerke (various municipal utilities) and Bebra Biogas GmbH.
Does C4 Energy have an API?
No public API is recorded for C4 Energy.
What industry is C4 Energy in?
C4 Energy's product category is Renewable Energy Production. Its primary akta.pro industry code is EUAAAEAH, Biogas/RNG Plant Development, EPC & Project Delivery, with a secondary code of EUACAIAG, Forestry & Wood Waste Biomass Power (Sawmill Residues, Black Liquor). Its NAICS code is 221117 and its SIC code is 4991.