As part of the transformation of the heat generation mix and in order to ensure the heat supply in the Berlin district heating network, Berliner Energie und Wärme GmbH (BEW) is planning the construction of an electric hot water generator plant (E-HWE) at the HKW Mitte site. The plant is used to provide up to 120 MW of thermal power to be fed into the existing district heating system. The construction of these hot water generation plants was combined by the contracting authority in one project (here referred to as the overall project), which consists essentially of 4 (four) lots: Lot 1: Planning, delivery, installation and commissioning of 3 (three) 40 MWth E-HWE and replacement of 3 (three) district heat pumps, including the associated complete plant construction at the HKW Mitte site (EPC Light SGM) Lot 2: Building & civil engineering services for the construction of a HWE building, switchgear building and transformer building at the HKW Mitte site (construction lot SGM) <-- NOT part of this notice Lot 3: Two (2) 125 MVA 110 kV / 22 kV transformers for HKW Mitte (PTSGM) <-- NOT part of this notice Lot 4: Two (2) 110 kV GIS systems with single busbar, each consisting of feed-in field and two exit fields, including protection and control technology, for HKW Mitte (GISSGM) <-- NOT part of this notice Part of this procurement project is Lot 1. This includes, inter alia: The turnkey delivery, installation, commissioning as well as documentation and training in connection with the construction of the E-HWE plant consisting of three electrode boilers each with 40 MW thermal output. The boilers shall be integrated hydraulically into the existing district heating network by means of primary and secondary circuits via heat exchangers. In addition to the boilers, the scope of services includes all auxiliary systems for pressure maintenance, emptying, control, pipelines and protective functions as well as integration into BEW's existing network control and protection technology. Lot 1 also includes the replacement of three district heat pumps, including the motor and frequency converter. The plant to be built must comply with the generally accepted rules of technology, the applicable DIN, EN and VDE regulations as well as the requirements for critical infrastructures (KRITIS). The generators are integrated by means of grid-separated primary circuits, which are specifically adapted to the conductivity and pH requirements of the electrode boilers. The system is controlled automatically with high dynamics to ensure load and temperature-controlled operation. Particular requirements exist in terms of efficiency, control quality, availability, cybersecurity, protection technology, control technology integration as well as verification in accordance with product safety and environmental specifications. All supplied components must be designed for durability and ease of maintenance.
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