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Case in point: a hot water heater. Seriously, think about it. A HUGE canister dedicated to keeping a reservoir of 60 gallons or so piping hot. All day long. Just in case you need hot water at any time. And for the 23 hours a day you AREN'T using hot water, that tank is just slowly leeching its heat out into the environment as waste.
The Europeans solved this years ago with Water On Demand. We're FINALLY seeing some adoption of these water heating systems (for those who don't know them, they are essentially a very small wall-mounted unit that heats incoming cold water AS NEEDED and doesn't keep it in reserve) - it was only a few years ago that Home Depot started stocking them.
I do have a good supporting example of the waste energy being useful, as well. Shortly before I was born, my dad built a water reclamation tank in basement of the house. It was basically a dishwasher-sized aluminum tank. Sewer water from all the bathtubs and sinks (minus kitchen sink which typically has far too much food waste in it) flows into this tank (and drains via an overflow into the sewer proper). The incoming cold water that's destined for the hot water heater travels through 40' of coiled copper piping inside this tank - essentially it pre-warms the water to be heated by the hot water tank. He went to great pains to chart the performance of the tank (and some tuning) and the energy savings netted a 25% reduction in gas needed by the water heater. That's substantial and requires NO energy and some minor maintenance (read: cleaning and seal inspection) every 5 years or so.
There are so many wasteful things we do that we can't see past as we look for alternative energy. Like with all things, the answer lies in between - we don't NEED a source of green energy to replace all of our energy consumption, because we don't NEED all the energy we're using. A hybrid of energy replacement coupled with a smart reduction of energy usage (which cannot mean a reduction in quality of life to get there) will get us so much closer.