Thats what happend to me I was charged more cuz they have certain tiers and I reached the highest tier for the first time in my whole life which has never happend and they can't seem to give me an explanation on why bill doubled..
You should be able to find the explanation yourself. Put all your old bills together and compare klw to cost, also check if your plan changed and the rates increase to tier change. Has your klw ph gone up? If so by how much? It seems what you need to find out is if your energy USAGE has gone up or you energy COST. Def. figure it out before blaming the neighbors as I doubt they or the General Construction they hired are willing to steal thus risking fines and penalaties, also stealing electric isnt easy. I have rentals and once a tenenant was using a ton of electric wood working at home. Once he reached the highest tier his electric plan auto switched to "commercial" which caused the bill to double. Anyways facts not speculation will resolve your problem, or at least provide an explanation.