Actually, Bitmain's building with 75% of mining capacity appears to run on wind and solar. https://bitcoinmagazine.com/articles/bitmain-reveals-plans-for-major

Actually, Bitmain's building with 75% of mining capacity appears to run on wind and solar. https://bitcoinmagazine.com/articles/bitmain-reveals-plans-for-major-bitcoin-mining-data-center-in-northwestern-china-1478797051/ https://bitcoinmagazine.com/articles/bitmain-reveals-plans-f... (was planned then, I believe it's in service now)