Saving energy successfully

Initiative 1000, Project Change and energy savings performance contracts

With staff and students motivated to use energy resources wisely and through a variety of energy saving programs, the University has successfully reduced its energy footprint.

Energy saving tips

  • Turn the heating thermostats down to positions 2 to 3 (room temperature recommended by the ministry is 20 degrees). 1 degree less in room temperature saves 6 percent thermal energy.
  • If you are absent for a longer period of time, at night, and on weekends, set the thermostatic valve to 1-2
  • Report defective radiators
  • Airing the room intensively at regular intervals is better than continuous ventilation with a window in tilt position
  • Keep the office door closed
  • Turn off the lights (especially in the evening and over the weekend)
  • Shut down your PC after use; put it into sleep mode or turn it off completely when not in use
  • Shut off the experiment after the end of the test series
  • Use socket strips that can be switched off
  • Keep windows and doors closed
  • Close the blinds / sunshade (if existing)
  • Check the extractor fans
  • Turn off air conditioning / ventilation systems in unoccupied rooms

Initiative 1000: "Switch Smart"

Past initiatives to save energy in the winter semesters 2014/15 and 2015/16 have been very successful for the University of Stuttgart. The goals of saving 1,000 MWh of electricity and 1,000 MWh of heat in six months were achieved. The next “Aktion 1000” is expected to start in the fall of 2020.

If you detect a malfunction or defective lamps or thermostats, please report the malfunction using the malfunction report form [de].

Video clip: Initiative 1000 - Saving energy made simple

Source: YouTube

Saving energy with energy performance contracts

In recent years, the University’s Energy Management office entered into several energy-saving performance contracts whose object was, among others, rehabbing many of our ventilation systems and their controls. To date, nine contracts have been let, of which four have been successfully completed. With the current contracts involving total investments of more than 13 million euro, the University is saving roughly 2.8 million euro annually in energy costs, (savings which, incidentally, are used to repay the contract borrowings.) That represents approximately 30% savings on heating or cooling and  6% electricity savings.
All our active contracts to date have achieved their objectives; in fact, they bettered the contractual forecasts by some 10% on average.


A degree day (“Gradtagzahl”, G t) and heating degree days (“Heizgradtage”, HGT, G) are measures of the demand for energy needed to heat a building during the heating period. They represent the relationship between the indoor temperature and the outdoor air temperature for the heating days of an assessment period and are thus a tool to determine heating costs and the demand for heating fuel.

A heating day (“Heiztag”, HT) is a day on which the measured mean outdoor temperature is below the heating limit. On such a day, the heating system has to be switched on to keep the indoor temperature at a desired value. The time from the first to the last heating day of the winter season, or a sequence of five heating days, is called a heating period.

The heating energy consumption is influenced by different climatic conditions from year to year. In order to compare the heating energy consumption of different years or different locations, the data must be weather-adjusted. For this purpose, the degree days are put in relation to those of a reference period and a climate correction factor is determined.


This image shows Harald Hentze

Harald Hentze


Energy Manager

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