What Green Fusion does

Green Fusion GmbH is a Berlin-based B2B SaaS company founded in 2021 that operates an AI-powered energy management system (EMS) for the German residential housing sector (Wohnungswirtschaft). The company's 360° Energiemanagement-Plattform digitizes and optimizes heating systems — conventional gas, oil, district heating, and CHP as well as regenerative heat pumps, PV, and battery storage — across multi-family residential portfolios. Two product surfaces sit on the platform: the Energiespar-Pilot, which analyzes ~4 weeks of operating data and continuously optimizes the heating curve of conventional systems, and the KI-Plattform für Sektorkopplung, a manufacturer-independent AI "brain" that coordinates heat pumps, PV, storage, and grid with a 5-second adjustment cycle and integrates dynamic electricity tariffs. The underlying technology is a reinforcement learning algorithm developed jointly over three years with TU Berlin's Hermann-Rietschel-Institut and funded by a €1.3M BMWK research grant; the AI is trained on anonymized operational data from approximately 4,000 buildings across Germany and delivers 8% additional energy savings beyond conventional engineer-driven optimization.

The platform is TÜV-certified under §71a of the German Building Energy Act (GEG), which exempts residential buildings using Green Fusion from mandatory heating inspections under §60b GEG — a recurring regulatory benefit to housing company customers. Green Fusion serves housing companies, municipal providers, and residential cooperatives (Wohnungsgenossenschaften), with named customers including Rheinwohnungsbau (191 heating systems across Düsseldorf and Duisburg), KHW (80+ systems / 1,300+ units through 2027), Howoge, Aroundtown, and Adler Group. Reported customer outcomes include 14–16% average energy savings on residential buildings, 25% increase in solar self-consumption, and ~€20,674 in annual electricity cost savings at a 55-heat-pump quarter.

The company generates revenue through recurring SaaS subscriptions for the energy management platform, supplemented by professional services for onboarding and commissioning, and — since May 2026 — an "Installation as a Service" model in partnership with AKF Bank that finances hardware and installation costs so housing companies can deploy without upfront CapEx. Distribution is enterprise field sales targeting portfolio-wide deals at large housing companies, supported by a partner ecosystem including aedifion (commercial EMS), Optiml (portfolio transition planning), termios (smart thermostats / hydraulic balancing), and Huawei (international industrial storage, including a December 2025 launch in Argentina). Total disclosed funding is approximately €12M (Series A ~$12.5M in January 2025 led by HV Capital and XAnge, plus a €1.3M BMWK grant and smaller Brandenburg state grants), and the company employs 11–50 people.

Name

Green Fusion

Legal name

Green Fusion GmbH

Website

https://green-fusion.de

Company type

Private

Founded year

2021

Operating status

Operating

Headcount range

11–50 employees

Short description

Green Fusion is a Berlin-based B2B SaaS company that provides an AI-powered 360° energy management platform for the German residential housing sector, digitizing and optimizing heating systems and sector coupling across multi-family building portfolios.

Ownership category

akta.pro rank

Product category

Building Energy Management Software

NAICS

Electric Power Generation (22111)

SIC

Services-Computer Integrated Systems Design (7373), Cogeneration Services & Small Power Producers (4991)

akta.pro primary industry

DER Aggregation & Virtual Power Plants (VPPs) (EUAMAJAC)

akta.pro secondary industries

Advanced Grid Integration & Control R&D (AI Forecasting, Digital Twins, Synthetic Inertia, Virtual Power Plants) (EUAMAOAG), Microgrid, DER & Building Electrification Energy Controls (Solar/Storage/EV Load Orchestration) (BPABAGAJ)

Keywords

• Building energy management
• Heating optimization software
• Sector coupling platform
• AI energy management
• Building automation systems

Headquarters

HQ city

Berlin

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

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

Revenue model

1. SaaS / Software Subscription (Energiemanagement-Plattform): Annual or multi-year subscription for access to the Green Fusion cloud-based EMS platform. The software is offered on a subscription basis with monitoring, analysis, optimization, and AI-driven control features. Pricing is not publicly disclosed but is structured as a recurring software license.
2. Installation as a Service (with AKF Bank): In partnership with AKF Bank, Green Fusion enables housing companies to start digital heating optimization without upfront CapEx. This model bundles hardware installation and software subscription into a service arrangement financed by the partner bank, removing capital expenditure barriers for customers.
3. Professional Services & Onboarding: Implementation, commissioning, and onboarding services for connecting heating systems to the platform. The company provides whitepaper downloads and webinars as lead generation tools, and engages in project-based consulting for housing company decarbonization strategies.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels6 records

Core offering

Green Fusion develops a cloud-based AI energy management platform (EMS) for residential building portfolios, with two main product lines. The Energiespar-Pilot digitalizes and optimizes conventional heating systems (gas, oil, district heating, CHP) by collecting ~4 weeks of operating data, analyzing heating curves, and uploading optimized parameters to the plant controller. The KI-Plattform für Sektorkopplung coordinates heat pumps, PV, storage, and grid connections across manufacturers, using reinforcement learning to enable dynamic electricity tariff optimization and 25% increase in solar self-consumption.

Differentiator

Problem solved

Functional benefit

Products and services

• Energiespar-Pilot (Energy Saving Pilot) Solution for digital heating boiler rooms (digitaler Heizungskeller) and energy-optimized operation of conventional heating systems. Analyzes, optimizes, controls, and automatically saves energy, costs, and CO2 for residential buildings with gas, oil, or district heating systems.
• KI-Plattform für Sektorkopplung (AI Platform for Sector Coupling) Advanced energy management system (EMS) for intelligent sector coupling, enabling heat pumps, PV systems, storage, and grid to communicate and coordinate. Klimaneutral and economically optimizes multi-family buildings through AI-controlled sector coupling with 5-second adjustment cycles.
• 360° Energiemanagement-Plattform (360° Energy Management Platform) Unified platform for heat and energy management of entire portfolios. Digitizes heating boiler rooms, automates and optimizes plant control across entire portfolios, and ensures smooth transformation and economic operation of all systems from conventional gas heating to fully regenerative heat pump systems with PV and storage.

Quantifiable outcome

• 16% average energy savings on residential buildings (average)
• +7 more outcomes

Named customers9 records

Segments2 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability3 records

Feature4 records

Partnerships

Seven partnerships are on record, tiered core and minor.

• AKF BankcoreGTM or Marketing Partner · 1 May 2026The 'Installation as a Service' partnership enables housing companies to deploy Green Fusion's digital heating optimization without upfront capital expenditure. AKF Bank finances the hardware and installation costs, while housing companies pay a recurring service fee. This removes the CapEx barrier and extends market access to housing companies with limited capital budgets.
• aedifioncoreStrategic or Co-development Partner · 4 March 2026Green Fusion announced a strategic collaboration with aedifion (commercial building energy management) and Optiml on March 4, 2026, to help real estate owners and operators decarbonize portfolios. The partnership connects building-level energy management optimization (Green Fusion delivers 16% savings on residential; aedifion delivers 22% on commercial) with portfolio-level transition planning and capital allocation. This enables owners to capture near-term efficiency gains and translate them into financeable capex sequencing plans across full asset lifecycles.
• OptimlcoreStrategic or Co-development Partner · 4 March 2026Part of the same strategic trio with aedifion and Green Fusion. Optiml's efficiency-first pathway can reduce estimated green capex needs by 30–50%. The collaboration creates a comprehensive offering from building-level optimization to portfolio-level financial planning for decarbonization.
• termioscoreStrategic or Co-development Partner · 1 January 2026Joint project partner in the Digitalpioniere 2026 award-winning Gütersloh case study. termios contributed smart thermostats and digital hydraulic balancing for individual apartment-level control, while Green Fusion provided AI-driven central heating optimization. The combined approach achieved 14% savings in year one (Green Fusion alone), with a target of 20–25% combined savings.
• Fuchs & Eule (Energy Consulting)minorImplementation/ SI/ Consulting Partner · 1 January 2025Energy consulting partner that collaborates with Green Fusion to analyze the positive effects of Green Fusion's building automation on energy certificates (Energieausweis). When an energy consultant renews a demand certificate (Bedarfsausweis), they can now document the presence of §71a building automation, potentially improving the building's energy rating.
• EINHUNDERT Energie (formerly einhundert)minorStrategic or Co-development Partner · 1 January 2024Partner in the ROCK227 project (Digitalpioniere 2024 award winner) alongside KHW. EINHUNDERT provides tenant electricity (Mieterstrom) models integrated with PV and heat pump systems. Green Fusion manages the intelligent energy coordination across the system.
• Hermann-Rietschel-Institut, TU BerlincoreStrategic or Co-development Partner · 1 January 2023Three-year research collaboration (2023–2026) with the Hermann-Rietschel-Institut at TU Berlin, funded by the BMWK 7th Energy Research Programme with €1.3M. Jointly developed a reinforcement learning algorithm for controlling complex sector coupling systems. The research was conducted with expert input from Green Fusion's heating, energy, and optimization specialists alongside the institute's academic team.

Scale indicators8 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• aedifion: aedifion is a Cologne-based AI-driven building energy management platform targeting commercial real estate. It is both a strategic partner (joint decarbonization offering with Green Fusion and Optiml) and the closest direct competitor in the adjacent residential segment, addressing the same German building EMS market with similar AI-based optimization.
• tiko Energy Solutions: tiko is a residential energy management and VPP platform that aggregates distributed energy assets (heat pumps, EVs, storage) across European households. It competes with Green Fusion in the residential sector coupling space, with a similar AI-driven optimization approach but distributed across individual consumers rather than housing-company portfolios.
• Kiwigrid: Kiwigrid is a German energy management SaaS provider offering white-label EMS platforms for utilities, OEMs, and real estate operators. It directly overlaps with Green Fusion's manufacturer-independent integration philosophy and serves similar end customers in the European distributed energy market.
• Loxone: Loxone is an Austrian-German building automation specialist offering smart home and commercial building control systems with heating optimization features. It competes for the same heating-and-energy-management budget as Green Fusion in residential and small-commercial buildings, with deeper hardware integration but less AI-driven optimization.
• tado°: tado° is a Munich-based smart thermostat and heating control company serving European residential and small-business customers. While more consumer-focused, it competes for the same heating optimization wallet and overlaps with Green Fusion's lower end of the housing-company customer base.

Broad incumbents

• Viessmann (Viessmann Climate Solutions): Viessmann is one of Europe's largest heating system manufacturers, with its Vitotelligence platform offering cloud-based heating optimization and management. As a hardware incumbent increasingly layering software onto heat pump and boiler installations, Viessmann represents a bundled competitor that can undercut standalone SaaS on integrated offering pricing.
• Bosch Building Technologies: Bosch offers broad building automation, energy management, and smart building solutions across commercial and residential markets globally. While not focused on the German Wohnungswirtschaft specifically, Bosch's scale and bundled offerings position it as a potential competitor or acquirer in the building EMS space.
• Schneider Electric (EcoStruxure): Schneider Electric's EcoStruxure platform provides building energy management and automation for commercial and residential portfolios worldwide. As a global broadline incumbent, it competes for large housing-company and real-estate-operator accounts and has the resources to acquire specialized AI-driven EMS vendors like Green Fusion.
• Honeywell Building Technologies: Honeywell offers comprehensive building management systems (BMS) and energy optimization platforms including the Niagara and Forge product lines. As a global broadline incumbent, it addresses larger commercial and institutional building portfolios and could extend down-market into the housing-company segment Green Fusion targets.

Emerging players

• 1Komma5°: 1Komma5° is a German climate-tech scaleup offering integrated heat pump, solar, and storage solutions with proprietary energy management software for residential customers. As a fast-growing adjacent player with software-controlled distributed energy assets, it represents both a potential competitor and a future channel partner for Green Fusion's EMS in Germany and beyond.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/green-fusion-gmbh
• YouTubeyoutube.com/channel/UCnotapplicable

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds4 records

Investors8 records

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 Green Fusion