Lid design and construction - PTES heat storage Hyvinkää, Finland

SCOPE OF THE PROJECT: Hyvinkään Lämpövoima Oy ("Contracting Entity") has a need for a PTES heat storage. The PTES heat storage construction project ("Project") includes at least the following subareas which are procured separately: - Excavation works and civil engineering works of the PTES heat storage, - Engineering works consisting of e.g. mechanical works, process heat works, electrical works, piping works, pump works, heat transfer works on related procurement, - Installation and engineering works for welded earth-facing sealing and protective membrane structures, and - Design and installation of the lid structure (this "Procurement"). SCOPE OF THE PROCUREMENT: The scope of this Procurement is the design and installation of the lid structure for PTES heat storage in fully operational condition (Turnkey delivery). The awarded contractor will be responsible for at least (but not limited): - Complete detail planning of the lid structure, - Project management and coordination with the Contracting Entity and other contractors at the site, - Delivery, assembly, welding and installation of the lid structure and materials/components included, - Electrotechnical installations of the lid structure, - Documentation and quality assurance, and - Testing of the lid structure. The lid structure must be designed/planned, prepared, delivered, tested, commissioned, and documented in accordance with the overall tender material (documentation of the Call for Tenders and documentation provided by Tenderer). The Scope of the Procurement is described in more detail in the appendices of the Call for Tenders. As stated above, the Procurement is one of the subareas of the Project. The Procurement contract for the Procurement is a subcontract subordinated under the PTES heat storage excavation works contract. The contractor of the excavation works contract will act as the main contractor. The main contractor is responsible for the construction site management and on-site services. The tender documents for the main contract are available at (in Finnish): https://www.hankintailmoitukset.fi/fi/public/procedure/8711/enotice/12751/ GENERAL INFORMATION OF THE PTES HEAT STORAGE: PTES pit thermal energy storage has the following technical characteristics: - Water volume is approximately 380 000 cubic meters, - Water height is 20 meters, - Surface area of the heat storage area including outer rails is approximately 67 700 square meters, - Surface area of the lid structure is approximately 37 250 square meters, - Basal area of the heat storage is approximately 8125 square meters, and - Inner slopes surface area is approximately 31 300 square meters and their slope is 1:2,5. PTES heat storage is located in a groundwater area. The construction site is located in Kulomäki old gravel pit in Hyvinkää.