Sydney Lord Mayor Clover Moore has struck a powersharing deal with the Greens, following the death of the council's deputy mayor.

The deal, or "memorandum of understanding", between Cr Moore and Greens councillor Irene Doutney​ will have the effect of cementing Cr Moore's position on council following the death in December of her political ally, Robyn Kemmis.

Greens councillor Irene Doutney is Sydney's new deputy mayor. Credit:Dallas Kilponen

"[This] is about giving the City of Sydney's communities and staff confidence in the continued effective governance and operation of this council," Cr Moore said.

The deal does not bind Cr Doutney and Cr Moore to vote together in all instances but Cr Doutney will agree to support the city's existing "budget" and "governance" arrangements unless she strikes a deal with the Lord Mayor specifying otherwise.