All of these business areas are also reflected in the building services used in the technology centre. Steel, glass and specially manufactured photovoltaic panels with thin film technology, as well as transparent PV panels were mainly used as building materials for the outer shell. 396 solar panels in total supply a total output of approx. 30 kWp.

A 50 kWel ‘Höfler Blockheizkraftwerke’ natural gas CHP was also installed. The highly efficient generation of heat and power in the combined heat and power plant makes a considerable contribution to conserving energy resources and reducing pollutant emissions. In particular, the use of combined heat and power reduces CO2 emissions by approx. 59 %. The Höfler CHP plant ET 50 LH is equipped with a high-performance Liebherr gas engine that is also suitable for the future use of fuel gas from biomass (biomethane).

The heat-controlled operating method of the CHP plant combined with the solar panels achieves an optimum customisation of the heat and power supply of the building. Power surpluses are thus fed into the regional grid and reimbursed. With a nominal load of 50 kW of electrical output, the CHP plant generates a thermal output of 80 kW, which covers the basic heating requirements of the building. During the summer months, the CHP plant heat is used to air condition the building with an absorption refrigerator. The high capacity utilisation of the CHP plant guarantees high cost effectiveness; long CHP plant running times ensure high yields from power production.

The cooling performance required in summer for the air-conditioning of the building is covered by a so-called "solar cooling" system of an absorption cooling machine in combination with a 200m² solar thermal system on the roof. In the process, the working pair of water-lithium bromide implements the input heat level of 86°C in cold water with an output temperature of 9°C. The heat ratio corresponds to a COP value of 0.75.

Should the heat requirements of the building exceed the output of the CHP plant, any demand peaks can be absorbed by a 270 kWtherm wood chip heater. Of interest here is the “contracting model" negotiated by Mr. Wimmer and a regional fuel supplier, according to which payment is made to the fuel supplier only for the amount of heat provided in the building. The invoicing via heat meters thus ensures the operator optimal fuel quality with a regional supply secured over the long term.

The fact that all of these systems are also designed and intended for isolated operation (emergency power) is self-explanatory considering the philosophy of the company. Even since the founding of the company, isolated systems have been conceived not only for the German market, but especially for operators with an inadequate or poor power supply.

The interesting installation in Eggenfelden which draws on all areas of renewable energy (solar, biomass, CHP plant) should provide the cornerstone for subsequent projects, not only in industry and commerce. HaWi Energietechnik was awarded the distinction of being among "Bavaria's Best 50" by the Bavarian state government in June 2006 not least due to this innovative approach and the consistent usage of renewable energies.