not sure where you are in the world but in US you can have balance billing so you get basically the same power bill every month based on historical usage. Therefore any change in your usage will not make any difference in your bill until the power company does an audit.
also in many places your rate per kwh is based on your single highest demand for electricity for the month, since they must have that much electricity available to you all month in case you demand that at any time.
where I live you can opt out of balance billing so you see a better reflection of your energy usage on each months bill.
every now and then I walk through the house room by room and look at each plug to decide does that device really need to be plugged in all the time or not. many of our electronics these days use almost as much electricity when they are turned off as when they are turned on so that you can enjoy 'instant on' when you decide to use it. so you are better off unplugging such devices until the moment you decide to use it.
