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Australia struggling with oversupply of solar power
(www.abc.net.au)
This is a most excellent place for technology news and articles.
Seriously... If he's spending ~3k a year on gas and even half of that is cooking, an induction stove would pay for itself within a few years.
Same for the water heater. The fossil fuel industry didn't spend decades promoting gas because it was the most efficient option.
It's not even all usage, it's all the other fees they slap on to make more profit.