Ukraine has shared a list with European countries of some 10,000 items it urgently needs to maintain power.
Since early October, Russian forces have targeted Ukraine's energy infrastructure, causing blackouts and forcing millions of people to endure sub-zero temperatures with little or no heating.
As stockpiles of state-owned European power grids dwindle, Lorkowski expected the private sector to become more important in meeting Ukraine's energy infrastructure needs.
A first tranche of U.S. power equipment worth $13 million has been shipped to Ukraine, officials said, and two more planeloads were due to leave shortly.
Olena Osmolovska, director of the reform support team at Ukraine's energy ministry, said it would cost tens of billions of dollars to fully restore the energy system.