Throw in the fact that as gate size shrinks and reduces the power used per logic element, miner manufacturers just put more logic cores into the chips and more chips into the miners to keep power usage around 3kw or more. Yes it gives faster hash rate per machine but users just get more of the better miners to keep their total power usage the same while increasing their hash rate -- they do NOT aim to keep same hash rate for less power
Good to know. Since the manufacturer aims to keep the same hashrate for less power, the only viable solution to Bitcoin's energy problem would be to run miners using renewable energy sources. ASIC machines running on solar or wind energy should make Bitcoin an environmentally-friendly cryptocurrency. I don't understand why someone like Elon Musk criticizes Bitcoin's "high energy consumption" when it can easily be solved with alternative energy. Mr. Musk could've used his company (Tesla) to make Bitcoin greener for the world. But not doing anything about it, shows us that he's only spreading FUD for his own financial benefit. It looks like the mining industry will continue to move forward regardless of negative criticism from public figures and mainstream media. Who knows how far ASIC machines will go in the future?