TransitionSiemens Gamesa launches revolutionary thermal storage pilotHot-rock plant in Hamburg could be first step towards making wind and solar dispatchableLeaders of the partners in the ETES project stand in front of the pilot plant in Hamburg. Left to right: Michael Prinz, Managing Director Hamburg Energie; , Andreas Feicht, State Secretary, Ministry of Economic Affairs and Energy; , Peter Tschentscher, Mayor of Hamburg; Markus Tacke, Siemens Gamesa chief executive; and Professor Gerhard Schmitz of the Technical University of Hamburg (TUHH).Photo: Siemens GamesaLeigh Collins