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I'm currently mining with a GTX1070 and the electricity cost is 150 W . To give you an indication, if i mine 24 hours i have: income(5.65 USD) -electricity cost(0.36 USD) = profit (+5.30 USD)

You can also calculate your own profit with this calculator: https://www.nicehash.com/?p=calc
Just fill in your hardware info and press calculate, it will subtract the electricity costs , and even show your ROI