Good find Phoenix. Not only will it save a bit of money but it should prolong the useful life of the miners by making them slightly more energy efficient.
And add a bunch more financial overhead that you'll likely never recoup over the lifespan of your mine. You need to be serviced by a shitty power company that has poor service for a P.F. Capacitor make sense.
Not only that, but any savings are marginal at best. If you take the first row of the chart on that webage as an example, the proposed savings is ~1.23% assuming $0.12 kW/hr.
Also, it won't make your miners more efficient, all it makes the distribution network more "efficient". However, that's only if your supplier is billing you like a dick in the first place by billing for total consumption and not on just the active power consumed.
Dropt... In Hawaii we pay 43 cents a kilowatthour, and other places have similar woes. Savings with PFCC's are achieved through magnetic resistance being lowered through resonant pulse, and has absolutely nothing to do with "Quality of service" You really should read a bit more before judging the cuisine. Simply put, the more electric you draw, the higher the savings will be, on a sliding scale. The more power you draw from your meter, the harder it is to draw more, it's called resistance, which is what this fights.
PFCC's make everything run more efficient by enhancing the magnetic field induction which moves the current, especially if your home is full of appliances which use capacitors, making all of them run more efficient with this magnetic field. It will also make those PCI connections COOLER for the same reasons.
and if you read my comment, it was meant for those who have multiple machines for that reason.
Don't you have one? lol 