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Exercise bike that can store 2KWh of electricity
(mastodon.social)
Technology for a Solar-Punk future.
Airships and hydroponic farms...
It's not about saving money. It's about using the energy that would otherwise not be used, and incentivizing exercise. If I could keep my phone charged from exercising, that would be cool. But yeah the price point is quite high.
Most people could probably never even break even in the cost of energy that it takes to produce one of these things.