In the control area of the north-east German transmission system operator (TSO) 50Hertz, the installed renewable energy capacity is particularly high. To avoid taking wind turbines off the grid in case of overcapacity, the TSCNET shareholder intends to efficiently use this green excess electricity. 50Hertz is already planning the construction of a Power-to-Heat (PtH) plant in the Baltic Sea port city of Rostock, and now another PTH cooperation in the Hanseatic City of Hamburg complements the cross-sector ambitions of the TSO.
This time the energy service provider GETEC is the partner of 50Hertz. Both companies intend to provide green district heating in the densely populated Mümmelmannsberg district of Hamburg. GETEC operates two combined heat and power (CHP) plants running on natural gas that supply around 7,000 residential and commercial units. In future, one of the two CHP units is to be regulated down if, during high wind conditions, more electricity is generated in northern Germany than can be transmitted to the south. This is where the PtH plant with an output of 5MW comes into play to convert the excess green electricity in an electrode boiler into emission-free district heating. The CHP and PtH units will be coordinated by smart control technology.
The investment costs amounting to €1.2m are fully covered by 50Hertz and the system is scheduled to be operational by the end of 2021. Dr Dirk Biermann, Chief Markets & System Operations Officer at 50Hertz, emphasises that the cooperation represents the first time for 50Hertz to support the construction of such a facility in a large city. The Hamburg PtH cooperation enables 50Hertz to “relieve a bottleneck in the extra-high voltage grid between Hamburg, Lower Saxony and Schleswig-Holstein to some extent and contribute to the more efficient use of wind power from the northern Germany”.