energy-efficient (adj)

Lighting is now more energy-efficient.
Energy-efficient LED bulbs use less electricity and have a longer lifespan than traditional incandescent bulbs.
The new appliances in the kitchen are energy-efficient, helping to lower monthly utility bills.
Building codes increasingly require the use of energy-efficient materials and design principles in construction.
The company upgraded its HVAC system to a more energy-efficient model, reducing overall energy consumption.