We pay high electric rates here too. Around $0.24 per kW is the year-round average cost including the demand/daily service fee and including tax.
My saltwater chlorinator draws 110W when running, and 1.8W on standby. FC Output is in my signature. It's currently set on 70%, (on 70% of the time, off 30% of the time) so while pump is on, I'm drawing about 80W average for the SWC.
My pump draws 200W on low speed and 600W for the suction cleaner or a fast skim, and 980W for backwash or a faster skim and I run around 7 to 10 hours per day, usually on low speed, depending how much the pool is being used, wind, leaves, etc.
SWC 80W x 10 hrs = 0.8 kWh per day or $0.20 per day - $15 per month (less when the water isn't as warm as it is today! - 31C 88F)
I think the poster with the big numbers didn't realize that cell draw is at 24 volts, not 110 volts, and was looking at a monster SWC given the 14+ amps mentioned.
I just checked my pool: 240v and 1.71a with both pump and SWC - and 1.38a with just the pump.