accoding to the whattomine (simple website to etimate bitcoin mining profit) : we need to have 35000 Antminer S9 with 14 TH specification to build a Bitoin during an hours, if each Antminer used 1.372 kW per hour this system need 48 MW power !!!
a- If you are able to prepare this power source you have to paid 48000 KW * power cost KWh b- we assumed typical power cost 0.1 $ we should pay 4800 $ for preparing a bitcoin c- if you are able to build this mining farm you have 35000*14 TH = 0.49 EH on bitcoin network
proof to above statements from another view: ============================== today Bitcoin network have 42 EH (variable upon to miners but when last time difficulty adjusted network speed was 37.04 EH ) mining network speed and bitcoin network adjust himself by difficulty according to his rules to make a block during 10 minutes. note that every block generate 12.66 BTC rewards for solver. during an hours typically we need 6 blocks so we have 12.66*6= 75.96 BTC.
75.96 BTC generated when u used total network speed ( 37.04 EH) so for 1 BTC we need roughly 0.49 EH Above information drive me to this thought bitcoin can not maintain below 4800 $ more than an hours.
============================== Residential rates in the U.S. range from 8.37¢/kWh to 37.34¢/kWh.[U.S. Department of Energy] The average (residential) national electricity rate rate is 11.88¢/kWh.
From (a) we can estimate lowest bitcoin price 48000 KWh * 0.1188 /KWh =5702 $
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Note
I will update this post when difficulty adjusted
Note
when the difficulty adjusted BTC network hashrate was near 51 Ehash/s after that increased up to 56 EH and now is 53.3 EH
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