While not Yuma, we paid 15 cents/KWH to the resort in Borrego Springs last January, just because I was bored I read the meter daily and checked what I was consuming, it ranged between $3 and $5 per day depending on the temperature and if we used the washer/dryer. I did a calculation and it was cheaper to heat by electricity than propane so that did increase our usage. It may be cheaper to use propane heating in Yuma at $2.15 per gallon for propane though