Question: Who was married to Michael Aris and was the first woman to serve as Minister for Foreign Affairs, for the President's Office, for electric Power and Energy, and for Education?
Sentence (from "Pumped-storage hydroelectricity"): Although the losses of the pumping process makes the plant a net consumer of energy overall, the system increases revenue by selling more electricity during periods of "peak demand", when electricity prices are highest.
Relevant evidence: No