Underground Energy Storage Technologies is a centre of excellence for underground storage facilities and aims at accelerating the implementation of hydrogen and carbon storage operations. It consolidates 95 years of combined corporate experience in underground storage gathered by the HOT Energy Group, RED Drilling & Services and Chemieanlagenbau Chemnitz (CAC) in collaboration with storage operators, leading universities and research organisations.
OUR COMBINED CORPORATE EXPERIENCE
Planned
>20
Billion Cubic Metres of Storage Capacity
Supervised
>10
Storage Surface Facilities Developments – from Concept to Operation
Planned & Drilled
>70
Energy Storage Wells
Completed
>56000
Metres Storage Reservoir
Built
>500
Industrial Plants
Commissioned
>30
Storage and Production Stations
Provide
>95
Years of Combined Corporate Experience
Our Key Team

Dr Diethard Kratzer
Management
Diethard Kratzer combines 30+ years of experience in consulting and R&D management. He is founder and CEO of HOT Engineering and heading the HOT Energy Group.

Dr Leonhard Ganzer
Research & Advisory
Leonhard Ganzer is head of the Institute of Subsurface Energy Systems at Technical University Clausthal in Germany focusing on underground hydrogen storage, CO2 injection, carbon capture and storage (CCS) or usage (CCU). He is experienced in leading roles of R&D projects and technology development for underground storage of hydrogen or CO2. He also acts as expert for the Austrian mining authority for underground gas storage projects.

Dr Andreas Harrer
Subsurface
Andreas Harrer is Head of Consulting Services for the HOT Energy Group. With almost 20 years’ in-depth experience in reservoir engineering and simulation, Andreas has conducted and supervised the modelling and planning of many underground gas storage facilities.

Leopold Hauser
Facilities
Leopold Hauser is a mechanical engineer with almost 30 years of experience in the development, execution and operation of Underground Gas Storages Surface Facilities – from concept development up to operation. As Engineering Manager of RAG Austria, one of the leading European storage operators, Leopold was serving the development of more than 10 gas storage surface facilities.

DI Heimo Heinzle
Drilling & Well Engineering
Heimo Heinzle is Technical Director at RED Drilling & Services. He is a petroleum engineer with more than 20 years of experience and has held a variety of positions as drilling engineer and engineering manager in Austria and abroad.

DI Joerg Engelmann
Project Management & Surface
Joerg Engelmann is CEO at CAC with more than 30 years of experience in the management of Large Industrial Projects including the implementation of surface facilities for natural gas storages. Since 2004 he has been leading the CAC Group of Companies.

Stephan Canzler
Process & Surface
Stephan Canzler is Senior Process Engineer and acting as Product Manager and Lead Engineer for projects of natural gas surface facilities and Compressor Stations. Since more than 30 years he has been responsible for the development of a customized process technology and the later commissioning of the respective facility.
ABOUT THE HOT ENERGY GROUP (HOT)
“While our core business originated in the upstream oil and gas industry, our innovations, technologies and solutions are scalable, expandable and portable across other energy systems and industries, and have made us a trusted advisor and partner for energy transition and innovative and sustainable energy solutions and subsurface energy systems.”
Dr Diethard Kratzer, Founder & CEO
ABOUT RED DRILLING & SERVICES (RED)
“Being a former operator, RED understands the needs of its clients and combines planning and operations experience of more than 1.200 projects with best in class performance while achieving highest quality and safety standards.”
di HEIMO HEINZLE, MANAGING DIRECTOR
ABOUT Chemieanlagenbau Chemnitz (CAC)
Chemieanlagenbau Chemnitz GmbH (CAC) is a renowned plant engineering company with more than 25 years’ experience in the planning, implementation and commissioning of gas plants and also surface facilities for natural gas underground storages by providing the whole range of engineering services from its own sources.
With around 400 employees, 280 at the company headquarters in Chemnitz, CAC has built more than 500 industrial plants worldwide.
“By considering our long term experiences and technological competencies, CAC is combining the flexibility of a medium-sized privately owned enterprise with project related skills and tools of a large Industrial Plant Manufacturer.”
DI Joerg Engelmann, CEO & Shareholder