Farkash-Hacohen is a graduate of the Faculty of Law at the Hebrew University of Jerusalem and clerked for Supreme Court Justice Dalia Dorner. She then began working for a leading law firm in the private sector, only to return the public sector as the head of the litigation for Israel's Antitrust Authority.
In 2003 Minister Farkah-Hacohen served as the legal advisor to the Public Utility Authority for Electricity and later was appointed as the first woman to serve as the chairperson and director general of the Israel Public Utility Authority for Electricity, a position she held for five years (2011-2016).
In 2006-2007 Minister Farkash- Hacohen attended Harvard University's John F. Kennedy School of Government, earning her master's degree in public administration.
During her tenure as chairperson, Minister Farkash-Hacohen pushed for opening up energy production market to competition, as well as encouraged the creation of Israel's renewable energy industry.
Until being appointed as a member of Knesset, Minister Farkash-Hacohen was a partner at a leading law firm in Israel, where she directed its energy and infrastructure practice.
Minister Farkash-Hacohen is a visiting fellow at both the Consortium for Energy Policy Research and Harvard University Kennedy School's Center for Business and Government Harvard Electricity Policy Group (HEPG).