Calor Energy Gmbh

What Calor Energy Gmbh does

CALOR ENERGY GmbH is a Hamburg-based (Zirkusweg 1, 20359 Hamburg) German renewable energy contractor and operator that delivers turnkey photovoltaic, Mieterstrom (tenant electricity), heat pump, and battery storage projects for the Wohnungswirtschaft (housing cooperatives and housing associations), commercial and industrial companies, and tax-optimized investors. The company structures engagements under two principal commercial models: Contracting (CALOR finances, plans, installs, and operates the energy system at zero upfront cost to the property owner, who contributes only roof space) and EPC (Engineering, Procurement & Construction) for clients that wish to own and operate the system themselves. An additional advisory offering structures PV and storage investments via the German Investitionsabzugsbetrag (IAB) regime, with €200K+ minimum PV tickets and €15–25K storage tickets. Confirmed operational scale includes ~20 MWp of installed PV reference capacity, 9.4 MWp of Mieterstrom capacity, 140 buildings in Wohnungswirtschaft projects, and access to Mieterstrom for 8,000+ households, including Germany's largest Mieterstrom project (WBG 'Treptow Nord' eG in Berlin).

The company's technical platform is its proprietary C4-System methodology — Concept (custom energy solution design), Capital (financing and IAB structuring), Construction (in-house EPC without subcontractors), and Care (ongoing operation, monitoring, and billing). C4 is operationalized through three digital tools: PV*SOL for system planning and yield simulation, Smart-Meter-Gateway/vSZ infrastructure for remote metering, and a white-label billing portal for tenant electricity settlement. The GEMEINSCHAFTSKRAFT consumer-facing tariff brand (€0.26/kWh solar power, 12-month contracts, monthly billing) sits on top of this stack for housing cooperative tenants. The company operates nine German offices (Hamburg HQ, Berlin, Munich, Dortmund, Dresden, Flensburg, Saterland, Ansbach, Bischofswerder) and employs approximately 30 people, including in-house Elektromeister, Elektriker, and SHK-Anlagenmechaniker teams.

CALOR ENERGY is a privately held GmbH led by Managing Director Morten Haderup, with no disclosed external investors, parent company, or funding rounds. Revenue is generated through a mix of one-time EPC project fees, recurring Mieterstrom electricity sales and tenant base fees, IAB-structured investment structuring and operational fees, and hardware/installation revenue from battery storage and HVAC systems. Pricing is project-specific with energy storage investment tickets at €15,000–€25,000, PV investment SPVs at €200,000+ minimum, and example 250 kWp PV systems priced at ~€300,000. Marketing combines direct enterprise field sales with Meta/Facebook Lead Ads, info evenings at housing cooperatives, and earned media in PV Magazine and Berliner Morgenpost.

Name

Calor Energy Gmbh

Legal name

CALOR ENERGY GmbH

Website

https://www.calor-energy.de

Company type

Private

Founded year

2023

Operating status

Operating

Headcount range

11–50 employees

Short description

CALOR ENERGY GmbH is a Hamburg-based German renewable energy contractor delivering turnkey photovoltaic, Mieterstrom, heat pump, and battery storage solutions to housing cooperatives, commercial/industrial firms, and IAB tax-optimized investors under its proprietary C4-System methodology.

Ownership category

akta.pro rank

Product category

Renewable Energy Services (Solar / Heat Pump Contracting)

NAICS

Solar Electric Power Generation (221114)

SIC

Cogeneration Services & Small Power Producers (4991), Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585)

akta.pro primary industry

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

akta.pro secondary industries

Electrical Balance-of-Plant EPC (MV Collection, Cabling, Earthing, Lighting) (EUAEADAB), Microgrid Development, EPC & Integration (EUAMAJAB)

Keywords

• Photovoltaic systems
• Tenant electricity
• Heat pump contracting
• Battery storage solutions
• Renewable energy EPC

Headquarters

HQ city

Hamburg

HQ country

Germany

HQ region

Europe

Offices9 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Photovoltaic (PV) Systems — Design, Installation & EPC: Full lifecycle revenue from photovoltaic system projects including planning, financing, construction, and operations. Revenue generated through EPC contracts with housing cooperatives, commercial/industrial companies, and property owners. Also includes ongoing monitoring and maintenance fees.
2. Mieterstrom (Tenant Electricity) — Contracting & Billing Services: CALOR installs, finances, and operates PV systems on residential buildings; residents purchase electricity directly from CALOR at rates below standard supply. Revenue from ongoing electricity sales to tenants plus monthly base fees. CALOR handles billing, meter management, and customer service.
3. IAB Investment Structuring & Advisory: For investors and property companies, CALOR structures PV investments that qualify for the German Investment Deduction (Investitionsabzugsbetrag, IAB), offering tax optimization benefits. Revenue from investment structuring fees and/or ongoing operational fees from managing investor-owned PV assets.
4. Heat Pump & HVAC Systems: Design, installation, and operation of commercial and industrial heat pump and refrigeration systems for warehouses, production halls, office complexes, and historic buildings. Revenue from installation contracts and/or long-term heating contracting arrangements.
5. Battery Storage Solutions: Sale, installation, and operation of battery storage systems (lithium-ion) for commercial and residential multi-family buildings. Revenue from system sales, rental contracts, or energy storage investment structuring for investors (15,000–25,000 € tickets).
6. EPC Model (Engineering, Procurement & Construction): For clients who wish to own and operate the energy system as their own energy supplier, CALOR provides full project delivery from planning through installation, but the client takes on the energy supply role and associated revenues.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels7 records

Core offering

Calor Energy GmbH plans, finances, installs, and operates renewable energy systems — primarily photovoltaics, heat pumps, battery storage, and tenant electricity (Mieterstrom) solutions — for housing cooperatives, housing associations, commercial and industrial companies, and outside investors across Germany. The company delivers turnkey EPC plus long-term operation/contracting under its consumer brand GEMEINSCHAFTSKRAFT, supported by a proprietary C4-System methodology and a white-label billing portal for partners.

Product overview

CALOR ENERGY operates two main business divisions — PV (Photovoltaik & Stromspeicher) and HVAC (Wärmepumpen & Kältetechnik) — unified under the C4-System platform. The C4-System (Concept, Capital, Construction, Care) is a standardized, end-to-end methodology for renewable energy projects covering design, financing, in-house construction, and long-term operation. The core product portfolio consists of Mieterstrom Contracting (tenant electricity via a zero-investment contracting model), Photovoltaik systems for commercial and residential buildings, Stromspeicher (lithium-ion battery storage), Wärmepumpen im Bestand (heat pumps for existing buildings), and Kältetechnik & Wärmepumpen (HVAC). Two investment sub-brands — IAB-Investition in Photovoltaik and Energiespeicher-Investition — offer tax-optimized investment opportunities leveraging the German IAB mechanism. The GEMEINSCHAFTSKRAFT brand is the consumer-facing tenant electricity tariff sold directly to cooperative members. Consulting & Konzeption rounds out the offering as a service module for feasibility analysis and ESG advisory.

Differentiator

Problem solved

Functional benefit

Brands

• GEMEINSCHAFTSKRAFT: Mieterstrom tariff brand for tenant electricity supply from solar power on rooftops.
• C4-System

Products and services

• Mieterstrom Contracting (Tenant Electricity Contracting)

Quantifiable outcome

• 9.4 MWp confirmed Mieterstrom capacity
• +8 more outcomes

Named customers8 records

Segments4 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration3 records

Feature5 records

Scale indicators12 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• IBC Solar: IBC Solar is a long-established German PV system integrator and wholesaler serving commercial, industrial, and residential customers with PV and storage solutions. Overlaps with Calor's commercial PV + storage EPC offering but with a broader installer-network model.
• BELECTRIC: BELECTRIC is a major European EPC and O&M provider for utility-scale solar PV and storage plants, with significant German project activity. Comparable to Calor's industrial PV EPC capability but at materially larger project sizes.
• Juwi: Juwi is one of Germany's largest renewable energy project developers and EPCs for utility-scale wind, solar, and hybrid projects. Comparable to Calor's industrial-scale PV work (e.g., the 9.1 MWp Magdeburg logistics hall) but operates at much larger scale and project size.

Direct peers

• Lichtblick: Lichtblick operates Germany's largest virtual power plant and offers Mieterstrom and tenant-electricity products to housing companies. Directly comparable to Calor's Mieterstrom Contracting model for Wohnungswirtschaft customers.
• Zolar: Zolar is a German online PV marketplace connecting homeowners with regional installers for rooftop solar systems. Overlaps with Calor's residential PV proposition, though via a different (digital/aggregator) go-to-market.
• NATURSTROM: NATURSTROM is a German renewable energy utility that develops, finances, and operates wind, solar, and district energy projects, with growing housing-cooperative and Mieterstrom exposure. Comparable to Calor's end-to-end renewable project development and electricity supply model.
• Enpal: Enpal is Germany's largest residential solar leasing and heat pump installer, offering zero-upfront PV, storage, and heat pump packages to homeowners. Direct overlap with Calor's rooftop PV and heat-pump offering for residential and small-commercial customers.
• 1Komma5°: 1Komma5° is a fast-scaling German platform installing PV, heat pumps, and EV chargers for residential and commercial customers under a "heartbeat" energy-as-a-service model. Comparable to Calor's end-to-end PV + heat pump + storage proposition, though with a much larger footprint and capital base.
• Solarwatt: Solarwatt manufactures and installs PV systems and battery storage for residential and commercial rooftops in Germany, with strong installer-partner network. Comparable to Calor's PV + storage offering, though Solarwatt is significantly larger and primarily product-led.
• EWS Schönau: EWS Schönau is a German citizen-owned renewable energy utility supplying green electricity and operating decentralised generation assets, including housing-cooperative rooftop projects. Comparable to Calor's Mieterstrom and cooperative-focused renewable-electricity business.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/calorenergy
• LinkedInlinkedin.com/company/calor-energy-gmbh
• Instagraminstagram.com/calor_energy

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

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 Calor Energy Gmbh