Overall energy usage in the city grew at a slower pace than the average economic growth in the 10 years to 2013, new data shows.
And from 2012 to last year, consumption of electricity alone fell 1.1 per cent.
One green group welcomed the official figures as a sign that the city was getting serious about saving energy. The statistics reflected public awareness of reducing energy consumption, Edwin Lau Che-fung, head of advocacy and education at Friends of the Earth, said.
"The slight drop is in a positive direction," he said. "It reflects a power-smart attitude among consumers and businesses."
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