Economics Minister Robert Habeck and his state secretary Patrick Graichen will face Bundestag committees on Wednesday (May 10) A joint hearing between the two committees was expected at 12.00 noon. Graichen was involved in the selection of the new managing director of the state-owned German Energy Agency (Dena) Graichen's sister, married to his colleague Michael Kellner, works like her brother at the Oeko-Institut - a research institution that receives commissions from the federal government.