Electric Service in Texas, Power to Choose question. So I am trying to compare electric rates in Texas.?

I went to powertochoose.com but my problem is, all the rates are based on if you use 1000 kilowatts a month and I usually use 500-700. Except last month it was super cold and I used 1400, but that is just the winter time that I use alot. So how can I find out how much it is based on small usage? Also it isnt fair that they charge me more cause I use less, I thought going green and conserving energy was the new thing to do lol.