We have solar hot water. Are you looking for hot water or electricity?
For the HW, we LOVE our panels! We have two, and the water tank has an electric coil in it on a timer with a sensor so that if the water isn't to temp at 4:30 in the morning, the electric coil comes on to heat water for showers and then shuts off at 5:30 or 6:00. It does the same thing at 5:00 in the evening for dishes etc...
We live in NE, so they do get covered with snow in the winter, but generally thaw off pretty quickly. When that happens, it just means that the electric works a little more. Not this winter, but the one prior when we had a TON of snow, our electric bill went up $10-$20 a month during the winter. This year, not so bad. Maybe $10 a month.
In the summer, boy howdy, you need to only have the hot water dial on a eeensy bit with a lot of cold mixed in or you will scald yourself! I LOVE taking a long hot shower and not having an ounce of guilt! Haven't bought one drop of oil since we put it in 3 years ago!