does the model need to be adjusting to change overpayments how long should a model of a bill be static can you adjust data in a billing statement when can i adjust the model of electricity usage when can you use the cheapest model to model electricity cost how to do an electricity cost model how many years of monthly usage can I use a two year surcharge on the average bill what is the correct method to modify a monthly bill? can you modify the data based on usage what can you do with a messy data set how to correct for a messy data why use a random based on electricity if i try to adjust my model how many years would that work can you model electricity usage data if i overcharge electricity for an example when does it hit? what data do you need for an electric bill to be accurate how to change the cost of electricity from year to year why use two years of data for electricity billing how to find out when electricity is going to be available at each time period