According to the site below, ~29.4 PH was added to true network over the last 12 days.
https://bitcoinwisdom.com/bitcoin/difficulty29.4 PH is an insane amount of hashrate, so hopefully some of the increase can be explained by above average luck, which will help with future difficulty increases as luck normalizes.
To put things into perspective, 29.4 PH/s is:
- 6,533 SP30s at 4.5 TH/s
- 66,667 S3s at 441 GH/s
- 29,400 S2s at 1 TH/s
Speculation points to Bitfury deploying massive private mining farms to explain most of the increase, but the scale we're talking about here is absurd. At 1W/GH, you'd need access to a 29.4 megawatts of power for such an increase.
Well, Bitfury can build in 30 days a 20 megawatts low cost data center and its objective is the centralization of the mining.