energy-saving
US /ˈenərdʒiˌseɪvɪŋ/
UK /ˈenərdʒiˌseɪvɪŋ/
1.
designed to use as little electricity, gas, etc., as possible
:
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We installed energy-saving light bulbs throughout the house.
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Buying energy-saving appliances can significantly reduce your utility bills.