Construction of Battery Storage System, Lot 2: Planning, Delivery, Construction, Commissioning and Acceptance of a Battery Energy Storage System (BESS) with a preferred output of 20 MW and a capacity of at least 40 MWh as a 2-hour storage system, including energy management system, fire protection, noise protection, control system connection, grid connection inverter, maintenance and service contract, training and documentation

SWE Energie GmbH is a company of the Stadtwerke Erfurt Group and, as an energy service provider, ensures the electricity, gas, and heat supply for Erfurt and the region. SWE Energie GmbH is a company subject to the KRITIS regulation. At the Erfurt Ost combined heat and power plant site, SWE Energie GmbH operates a CHP plant, which essentially consists of the following components: Gas and steam turbine plant with three waste heat boiler systems (Line 1, Line 2, and Line 3), hot water generator, heat storage, power-to-heat plant. Due to changing political and market conditions (decarbonization), SWE Energie GmbH intends to increasingly rely on renewable energies in the future and plans to expand the existing combined heat and power plant with various renewable energy plants in accordance with its own transformation plan. As a supplement to the transformation planning, the construction of a BESS is initially planned to strengthen the electricity generation/marketing business unit. The contracting authority intends to commercially utilize the system from July 1, 2028, at the latest. The planning, delivery, construction, commissioning, and acceptance of a fully functional BESS are being tendered. A symmetrical distribution of the BESS output to two 10kV grid feed-ins of the existing plant is mandatory. The system is to be erected as an outdoor installation (battery container, skid, possibly own consumption transformers, possibly short-circuit current limiting reactors (MV switchgear Ik = 40 kA)). The BESS must meet the following performance requirements: - Grid service provision: PRL, aFRR mFRR, Optional instantaneous reserve - Market-based management, arbitrage (ID, DA, CID) - Reactive power control according to VDE-AR-4110 Section 5.5 and 6.3.2 upon request of the grid operator. The parallel operation of two identical battery units, each with an output of 10 MW and a capacity of 20 MWh (total 20 MW output and 40 MWh capacity), is planned. Within the scope of its turnkey responsibility, the contractor must supply all necessary components and parts, in particular: inverters, own consumption transformers (Ik = 40 kA), control and regulation systems, battery containers, and design them in such a way that safe and unrestricted parallel operation of both units is guaranteed. All components will be installed outdoors. 1. Scope of Services and Main Components The scope of services is understood as the turnkey construction (turnkey realization) of the battery storage system by the contractor. This includes complete planning, delivery, assembly, commissioning, and operational handover. This includes: - Battery container: Total capacity of at least 40 MWh with a net output of 20 MW at the interface, including all internal DC cabling, battery management systems (BMS), fire protection and extinguishing systems, early fire detection, and safety shutdown, as well as container internal climate control. - Inverter skid: Complete outdoor platform (skid) equipped with the required battery inverters and associated controls. - Own consumption transformers (EBT), concept for own consumption supply: Cooling of the battery cells must be ensured when the 10 kV medium voltage is switched off. - Noise protection measures: Complete planning and implementation of all necessary noise protection measures (e.g., silencers for air conditioning units, noise-optimized inverter cooling or enclosures) to reliably meet the officially prescribed immission limits at the site. - Obligation to cooperate in obtaining the building permit and other official matters by the contractor. 2. Assembly, Commissioning, and Acceptance - Delivery and Assembly: The contractor is responsible for the complete transport (DDP site), unloading, lifting onto foundations, and complete mechanical and electrical assembly of all delivered system components within the scope of turnkey responsibility. - System internal wiring: The contractor must fully wire all inverter skids with the associated battery containers as part of the turnkey business. This includes the complete laying and connection of all DC power cables, control and communication lines (e.g., BMS/EMS connection), and auxiliary power cabling between the containers and the skids. - Commissioning: Carrying out the commissioning of all subsystems up to the complete, turnkey operational readiness of the entire system. - Acceptance measurements: Carrying out all contractually agreed performance and acceptance tests on-site, in particular capacity measurement (Capacity Test to verify the guaranteed usable energy). - Support and ensuring certification according to VDE 4110 and VDE 4120 for the intended operation of the entire system, as well as training of the operator personnel. 3. Interface Definition (Lot/Trade Separation), in particular: Electrical Engineering: Connection to the higher-level grid will be carried out by the client. - Interface: The physical and functional interface is at the medium-voltage connection terminals of the transformers on the skid and, if necessary, at the EBT. Construction: Civil engineering and foundation work will be carried out by the client. - Interface: The top edge of the floor slabs or strip foundations. - The client will create the foundations according to the static and dimensional specifications, which the contractor must provide in a timely manner as part of its planning services. The installation, alignment, and anchoring of the containers/skids on the foundations remain the responsibility of the contractor. Control Engineering: - Grid connection inverter is part of the contractor's scope of services. - Provision of a communication interface o to the upstream grid operator (SWE Netz GmbH) o to the marketer/energy trader/external service provider o to the main control system of the existing generation site. 4. Maintenance Contract