Workers on Monday began putting photovoltaic cells on the roof of Paul VI hall to convert sunlight into electricity.
Vatican engineers announced the plan for the first solar panels last year.
Pope Benedict XVI's has made conserving the Earth's resources an important concern of his papacy.
Pilgrims attend weekly audiences in the hall during winter as well as in other seasons when the weather is too bad to gather in St. Peter's Square.
Rome gets lots of sunshine, and engineers say the cells will produce enough electricity to illuminate, heat or cool the hall.
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