Decisions and leadership
SPARRING
For management, shareholders and advisory boards: strategy, investments, transformation, growth, succession and exit.
Learn more about sparringOver 30 years of entrepreneurial experience
From Strategy to the Socket.
HUMMEL Service Group combines entrepreneurial sparring with commercially sound energy solutions for mid-sized businesses. We support strategic decisions, assess energy potential at each site and coordinate implementation with selected specialist partners.
Frank Hummel
Founder and Managing Director
An entrepreneur since 1993. Experience in building businesses, leadership and growth – with technical expertise in energy, digitalisation and building technology.
More than 30 years
First-hand entrepreneurial practice in energy and building technology.
100+ employees
Built HUMMEL Systemhaus and grew it to more than 100 employees.
Technology and commercial viability
Assess energy investments as an integrated system – technically sound and commercially transparent.
Our own location
PV, storage, heat, charging and energy management.
How we work together
From the question to ongoing operations.
- 01
Clarify the decision
We work with you to clarify objectives, boundaries and options – through personal sparring on equal terms with management and advisory boards.
- 02
Assess the site
With the REVOLUTION E All-Electric Site Assessment, we evaluate electricity, heating, process heat and mobility on site – as a basis for decisions by management, CFOs and banks.
- 03
Orchestrate delivery
Bring the right specialist partners to the table with a manufacturer-neutral approach – contracts directly with you and coordination from one source.
At our own location
Energy expertise in our own operations.
The Innovation HUB in Frickenhausen in the Stuttgart region brings together live operations, demonstration and personal exchange. Here, you can experience how photovoltaics, storage, heat and charging infrastructure work together in everyday use.
Roof area as a power plant
Photovoltaics on the flat roofs – the foundation for self-consumption, storage and charging.
Delivery with heavy lifting
On-site storage installation: trades, logistics and commissioning work together. The storage installation was completed by HUMMEL energize.
Innovation HUB
A meeting point for decision-makers: hold conversations where the technology is running. Spaces are available on request.
HSG owns the location and the systems. HUMMEL energize is an independent company and provides the agreed operations and service activities for energy generation and charging infrastructure.
Your starting point
An entrepreneurial approach. Three strong building blocks.
HUMMEL Service Group connects business decisions, commercial energy planning and real-world practice at our own location. Choose the entry point that fits your current question.
Energy as an integrated system
REVOLUTION E
All-electric site assessment and business case for electricity, heat, process heat and mobility – a foundation for investment decisions and delivery.
Explore REVOLUTION EPractice and exchange
Innovation HUB
Experience energy and building solutions in operation, develop ideas together and explore approaches at a real location.
Discover the location
Frank Hummel · SPARRING
Experience. Clarity. Execution.
I am an entrepreneur myself. As an entrepreneurial sparring partner, I work with you on your next decision and its execution, combining first-hand experience with a clear commercial and technical perspective.
- Experience in energy, digitalization and building automation since 1993.
- Experience in growth and company sales from my own entrepreneurial practice.
- I support decisions through to implementation – working with the right specialist partners.
Practice and business cases.
All case studiesHSG-owned location
Innovation HUB
Building, energy and mobility as a system: 77 kWp PV, 270 kWh storage and 150 kW DC charging.
Our own operational evidenceVilla Neuffen
All-electric since 2016. Ten years of operating experience and a separately documented comparison model for 2026.
District developmentIndustrial district
An integrated energy concept as a commercially sound basis for decisions in an industrial area.
Concept · process industryHydrogen steam generation
A business case for transitioning industrial process steam generation to green hydrogen.
Frank Hummel · Track Record
Experience that supports your decision.
Built a company. Shaped growth. Held responsibility within a corporation. This experience now informs your energy and transformation decisions.
1993
Founded HUMMEL Systemhaus
Built a company and developed it to more than 100 employees.2020
Sold the company
Strategic sale to Ed. Züblin AG in the STRABAG Group.2020–2023
Corporate leadership
Executive and division leadership within the corporate structure.Today
