Overview
- Hamburger Energiewerke began foundation works for the Tiefstack heat storage in Billbrook, with Environment Senator Katharina Fegebank attending the launch.
- The facility will store up to 43 million liters of hot water for the district-heating network to dispatch heat when needed, including from waste-heat sources.
- Construction is scheduled to finish by the end of 2027, with commissioning planned for the first half of 2029 after system integration.
- The storage is a core element of the Energiepark Tiefstack, which also includes a planned river-water heat pump and the site's conversion from coal to gas before 2030 to meet the coal exit on the Stadtnetz.
- HEnW plans a low double‑digit million‑euro investment for the storage, backed by federal and EU funding, within a €2.85 billion heat-transition program for 2022–2028.