Our S&B home is fairly big (4350 square feet) and we've been getting hammered by San Diego Gas & Electric's rates for a few years. During the Winter and Spring, our rate is .42 cents per KWH, and in the Summer and Fall, it's .51 cents per KWH. (We just got notified last week that the rates are going up again) Our electrical bills in the winter average a little over $400 per month, and $1000 per month in the summer.
About two years ago, we decided to replace all the interior bulbs, and exterior flood lights with LEDs, in an attempt to reduce our electrical bills. I had noticed a substantial difference in the RV's power consumption by switching to LEDs, so I assumed we'd see a similar reduction at the house. I never actually measured the "before and after" difference in power consumption, and logic tells me that there is a difference, but we've noticed virtually no difference in our monthly bills.
We really like the brightness and color temps of the LEDs compared to the fluorescent and incandescent bulbs, and I love the fact that I haven't had to replace any of the LEDs, but it was expensive to make the swap. As I type this, 14 KW of solar is being installed on the roof, and that will definitely bring our monthly bills down.
Kev