Telecommunications
A major German telecommunications provider was already supplying 100% of the electricity needs for its
administration facilities with renewable energy. Our task was to help them further reduce their energy
consumption while at the same time drastically lowering their CO2 emissions. Our success is clearly visible
in the yearly savings that we managed to generate for them.
geff Modules applied in this project
visualization+ | Complete analysis of the system including actual versus target performance comparisons for the equipment |
ventilation+ | Conversion to performance-optimized ventilators. Reduced the volume of air flow |
cooling+ | Conversion to performance-optimized cooling. Adjustment of the room temperature set-points |
control+ | Demand-response controls for the ventilation and cooling equipment |
Results
Power demand before geff (per year) | 59.130.000 | kWh |
|
Power demand after geff (per year) | 19.710.000 | kWh |
|
Savings |
39.420.000 |
kWh per year | |
calculated at 0,1134 Euro/kWh |
4.470.228 |
Euro per year |

Automotive OEM – Ventilation
A large German automobile producer with multiple production facilities throughout Germany operates a many older ventilation systems, which were in desperate need of being optimized for energy efficiency. The challenge in this case, was that the retrofit work had to for the most part take place during ongoing production in the factories, as demand for new cars simply did not allow for production downtime.
geff Modules applied in this project
visualization+ | Complete analysis of the system including actual versus target performance comparisons for the equipment |
ventilation+ | Replacement of obsolete ventilators with 330 new high-efficiency centrifugal fans |
Adjustment of air flow volumes | |
Deinstallation of obsolete motors and installation of new high-efficiency motors | |
control+ | Installation of frequency inverters and demand-response controls for the ventilation equipment |
Results
Power demand before geff (per year) | 106.149.320 | kWh |
|
Power demand after geff (per year) | 60.985.004 | kWh |
|
Savings |
45.164.316 |
kWh per year | |
calculated at 0,1134 Euro per kWh |
5.121.633 |
Euro per year |

University Hospital
This university hospital treats approximately 700.000 patients each year. Its primary focus is oncology.
Energy efficient ventilation equipment is helping them save an average of 4.012.080 kWh of energy per year.
geff Modules applied in this project
visualization+ | Complete analysis of their facility systems |
ventilation+ | Replacement of 12 obsolete fans with new centrifugal fans equiped with flat-belt drives and high-efficiency motors |
Removal and disposal of unnecessary noise-control baffles | |
Exchanged defective air-volume flow controller and exhaust flaps | |
control+ | Installation of- and electric connection work for new frequency inverters |
Demand-optimized control of the ventilation and heat recovery equipment |
Results
Power demand before geff (per year) | 10.441.920 | kWh |
|
Power demand after geff (per year) | 6.429.840 | kWh |
|
Savings |
4.012.080 |
kWh per year | |
calculated at 0,1134 Euro/kWh |
454.969
|
Euro per year |

Medical Center
This medical center includes a medical clinic, ambulatory practice, ambulatory rehabilitation unit, and senior living facilities. The multifunctional nature and high patient traffic that this facility deals with on a regular basis present many challenges. Nonetheless, geff was able to help significantly reduce their energy costs.
geff Modules applied in this project
visualization+ | Complete analysis of their facility systems |
ventilation+ | Removal of 8 axial fans and replacement with 8 centrifugal fans equiped with flat-belt drives and high-efficiency motors |
Removal and disposal of unnecessary noise-control baffles (576 units) | |
Removal of external air dampers and replacement with 4 section-rolling doors | |
recovery+ | Installation of a highly-efficient combined circulation heat recovery system (including the necessary plumbing work) |
control+ | Installation of- and electric connection work for new frequency inverters |
Demand-optimized control of the ventilation and heat recovery equipment |
Results
Power demand before geff (per year) | 8.015.400 | kWh |
|
Power demand after geff (per year) | 3.784.320 | kWh |
|
Savings |
4.231.080 |
kWh per year | |
calculated at 0,1134 Euro/kWh |
479.804 |
Euro per year |

Production Hall – Equipment Manufacturer
A manufacturer of industrial equipment and robots requested an energy savings analysis for the lighting in one of its production halls as part of the company‘s internal corporate energy savings program. The results of the analysis showed that the existing high-bay lighting in the hall was giving off much less light than the latest new lighting technologies, even though they use the same amount of energy.
geff‘s solution was an intelligent LED high-bay luminaire system with built-in occupancy and daylight sensors and dimmers, which could be mounted on the existing fixtures (at a height of 8 meters) and offered an anti-glare technology with guaranteed maximum energy efficiency at extremely high light output. Additionally, the client is able to monitor and custom-adjust each individual luminaire via a very simple software solution, leading to further savings through the automatic reduction of lighting hours based on occupancy and daylight.
geff Modules applied in this project
visualization+ | Audit of the existing lighting system, including analysis of actual versus target performance levels |
Comparison of different technical solutions and brands, followed by a demonstration installation and evaluation. | |
lighting+ | Deinstallation and removal of the existing lighting |
Installation of 77 intelligent LED high bay luminaires (240W) | |
control+ | Evaluation of the new software and follow-up commissioning to set up the various lighting scenarios for availability of daylight and the presence of employees |
Results
Power demand before geff (per year) | 374.374 | kWh |
|
Power demand after geff (per year) | 40.841 | kWh |
|
Savings |
333.533 |
kWh per year | |
calculated at 0,18 Euro/kWh |
60.036 |
Euro per year |

Achieving longterm energy cost reductions
In these Sectors
Automotive Industry
Banks and Finance
Construction
Chemical Industry
Data Center
Electronics Industry
Utilities
Research Institutes
Airports
Real Estate
Retail
Clinics
Power Plants
Municipalities
Cosmetics Industry
Food Processing Industry
Logistics
Aerospace
Petroleum Industry
Trade Shows
Optics Manufacturing
Paper Industry
Pharmaceuticals
Broadcast Industry
Swimming Pools
Telecommunications
Universities
Covering these Solution-Areas
Waste-Heat Recovery
Demand Optimization
Lighting Systems
Bioenergy
Compressed Air Systems
Electrical Drives
Energy Management
Electrical Energy
Energy Recovery
Geothermal
Heating Systems
Refrigeration Systems
Ventilation Systems
Mechanical Systems
Monitoring
User Behavior
Process Technology
Control Systems
Solar Energy
Hydroelectricity
Heat
Wind Energy
Efficiency Optimization
Together with our Partners for these clients
Adam Opel GmbH
Allianz Immobilien GmbH
AUDI AG
Bausparkasse Schwäbisch Hall AG
BMW AG
Boehringer Ingelheim Pharma GmbH & Co. KG
BorgWarner Inc.
Carl Zeiss AG
Commerzbank AG
Credit Suisse AG
Daimler AG
Deutsche Bahn
Deutsche Bank AG
Deutsche Lufthansa AG
Deutsche Telekom AG
Deutsches Zentrum für Luft- und Raumfahrt
Dr. Horst Schmidt Klinik
E.ON Kernkraft GmbH
EnBW Kernkraft GmbH
ESSO Deutschland GmbH
Fachhochschule München
Ferrero OHGmbH
Flughafen München GmbH
Flughafen Stuttgart GmbH
Flughafen Zürich AG
Forschungszentrum Karlsruhe
Fraport AG
Grace Manufacturing GmbH & Co. KG
Hochtief Energy Management GmbH
Klinikum Augsburg
Klinikum Bamberg
Klinikum Nürnberg
Kölnbäder GmbH
Kreiskrankenhaus Böblingen
L’OREAL Deutschland GmbH
Merck KGaA
Messe Frankfurt
Venue GmbH & Co.
KGPASM GmbH & Co.KG
ProSieben Sat 1 Media AG
Robert Bosch GmbH
RWE Energie AG
Siemens AG
Sparkassen Informatik GmbH & Co. KG
Staatliches Hochbauamt Stuttgart
Staatsoper Hannover
Staatstheater München
STRABAG Property and Facility Service GmbH
SüdWestRundfunk
Technische Hochschule Darmstadt
Universitätsklinikum Frankfurt
Universitätsklinikum Heidelberg
Universitätsklinikum Tübingen
Volkswagen AG
ZF Lenksysteme GmbH
Züblin AG
Zweites Deutsches Fernsehen