Eberstadt Decarbonization Step 1 Wastewater Heat Pump System Lot 1: Planning of Plant Technology for Heat Generation – Technical Equipment according to §§ 53 ff. in conjunction with Annex 15 HOAI including connection to the sewage treatment plant and Technical Installations (components) in the outdoor/open space area from performance phase 2 for the eligible transformation of the heating network.

ENTEGA AG ("Client" or "AG") owns and operates the district heating network in the Eberstadt district of Darmstadt and the local heating plant, from which households in the district heating service area and the few connections outside the service area are supplied. Likewise, Entega Abwasserreinigung GmbH Co KG operates the Süd sewage treatment plant in Eberstadt. For the transformation of the district heating network towards greenhouse gas-neutral heat supply (decarbonization), the Client aims to obtain funding from the "Federal Funding for Efficient Heating Networks (BEW)" funding program. As a first step towards decarbonization, a transformation plan based on LPH 1 of the HOAI for the district heating network has already been carried out with funding from the BEW Module I. The transformation plan concludes that the thermal use of wastewater by means of a heat pump system at the sewage treatment plant in Eberstadt can represent a cost-effective and suitable option for providing the required share of renewable energies from 2030 onwards. The estimated usable heat potential that can be extracted from the wastewater using heat pumps is almost 20 GWh per year with a nominal thermal output of the heat pump of approx. 3 MWth. The heat pump is to be located near the local sewage treatment plant on a plot of land yet to be developed. The development of the plot as a building plot is planned by the architect separately commissioned by the Client for object planning. The planning of wastewater heat in this area, including the connection/integration of the heat pump into the district heating network, is part of the present commission. Initial checks on the suitability of the site lead to the preliminary conclusion that corresponding development of the plot is possible. Further checks must be carried out in the planning phases according to their relevance and official requirements. The planning for the overall concept of the new heat supply is divided in this context into "Plant technology for heat generation", "New construction of an energy center (building and outdoor facilities)" and "Piping for connection to the district heating network". The service advertised here includes the necessary (planning) services for the plant technology in terms of technical equipment for heat generation from wastewater. This includes the plant technology, in particular including heat pumps, auxiliary units, internal connecting pipes, connection to the sewage treatment plant for raising the heat source, operating materials, fittings, and required electrical connections. The contractor will be commissioned with (specialist) planning services for technical equipment according to §§ 53 ff. in conjunction with Annex 15 HOAI, including connection to the sewage treatment plant and technical installations (components) in the outdoor/open space area from performance phase 2 for the eligible transformation of the heating network. The contractor shall provide all services necessary for the functional, technically flawless, timely and eligible execution of the commissioned measure, even if they are not expressly mentioned in the contractual components. The contractor will be commissioned in stages. Upon conclusion of this contract, the Client will initially commission the contractor with the following performance phases/performance levels: • Performance phases 2 to 4 (= Stage 1). The following stages are planned for further commissioning: • Performance phases 5 to 7 (= Stage 2) • Performance phase 8 (= Stage 3) • Performance phase 9 (= Stage 4) If commissioned, the contractor shall also provide the following additional services (Special Services): • Optional service: Planning of two further heat generators. • Optional service: Planning relocation of gas boiler. However, the contractor has no claim to be commissioned with these optional special services. The client points out at this point that for the...