Using the lid during the pasta boiling phase speeds up the time and saves up to 6% of energy and CO2 emissions, enough to recharge a smartphone 2-3 times. The primacy of savings goes to passive cooking: after the first 2 minutes of traditional cooking, the pasta cooks indirectly, with the heat off and with a lid.
These are the three rules remembered by the pasta makers of the Italian Food Union, in view of the National Day of Energy Saving and Sustainable Lifestyles on 16 February.