Genesis is calling on the Government to ban incandescent light bulbs as New Zealand lags behind many other countries.
It says swapping them out for LED bulbs can save households about $300 a year.
Genesis chief revenue officer Stephen England-Hall says he's backing a ban because they're not being taken off the shelves voluntarily yet.
He says the difference between the two types is massive.
"A dollar of electricity gives you about 250 hours of LED lighting and $1 of electricity gives you 25 hours or less on an incandescent bulb."
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