This is the way of the future: a street lamp powered by solar panels and a small wind turbine, with a battery to store power for when there's been neither sun nor wind, which is still 20% cheaper than a street lamp connected to the grid.
I particularly like the nifty little turbine and can imagine a strip of them sited on the ridge of my roof.
The key point to take away though is that this is the future: the costs of wind, solar and batteries are going to keep on falling and ultimately no fossil fuel will be competitive. Especially if a carbon tax becomes a widespread reality.
Disclaimer. After nearly 40 years managing money for some of the largest life offices and investment managers in the world, I think I have something to offer. But I can't by law give you advice, and I do make mistakes. Remember: the unexpected sometimes happens. Oddly enough, the expected does too, but all too often it takes longer than you thought it would, or on the other hand happens more quickly than you expected. The Goddess of Markets punishes (eventually) greed, folly, laziness and arrogance. No matter how many years you've served Her. Take care. Be humble. And don't blame me.
BTW, clicking on most charts will produce the original-sized, i.e., bigger version.