I was called to change my gas service to spark and same a minimum of 8% off my gas bill. I signed up in anticipation of the savings. The first month I saved 8% the second month I save 13%, so I was satisfied that they were charging as I had anticipated. The following three months I did not check my bill. The bill was high but it were cold months. Then I checked again and realized that they then charged me 72% more then what I would pay Nicor. Each month after that Spark Energy charged as high as 81% more than Nicor and as little as 64% higher... read full review »