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Energy efficiency concept
Keywords:
leaf
electricity
efficiency
fuel and power generation
power supply
environmental conservation
alternative energy
nature
energy efficient
environment
technology
light bulb
battery
concepts
no people
plant
savings
energy efficient lightbulb
ecosystem
economy
chart
certificate
resourceful
finance and economy
industry
low
social issues
equipment
vitality
level
rating
alternative energy
energy efficiency
efficiency energy
energy efficient
efficiency levels
certificate nature
low rating
energy certificate
lead battery
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