Start by comparing your usage and the Kwh charge. January was very cold across most of the country so people used more electricity to heat their homes. If your usage is up, then you have found the cause and there is no one to complain to. If usage is roughly the same, call the Co-op to find out whether the previous month's charge was an estimate or a real reading - if it was an estimate and this month was a real reading, then last month's estimate was probably low and you are making up for not paying enough.
Finally, if the KwH charge is up, you need to find out of they were granted a rate increase that is kicking in now in which case you are not being ripped off but like anything else, costs are up and passed on to you.
Before you can complain, you need to have a basis for your complaint and those are the three major influences on your bill, none of which will be solved by complaining since they are all legit.