My grandparents always dreamed of the day their grandchildren would live in the dark.

The government estimates that replacing the 87 million incandescent bulbs in use across Ontario with more efficient bulbs would save six million megawatt hours every year — enough to power 600,000 homes.

Changing to more efficient bulbs is also the equivalent — in terms of greenhouse-gas emissions — of taking 250,000 cars off the road, said Ontario Environment Minister Laurel Broten, who announced the move along with Energy Minister Dwight Duncan on Wednesday morning.

We'll see -- they'll have to provide a lot more light than the 40 watt ones I'm using around the house, or people will just start doubling and tripling them up.

Update: given the timeframe for implementation, that many people have started making the transition and that the price should fall significantly over the next 5 years, this looks like a very clever way of taking credit for something that was already happening.