The daily may be accurate. but most likely the appliance level is based upon the usage estimates per day the database has for each item, based upon survey answers. . . though the company doesn't know wheyou are home or not, so the estimate will take the always on item estimates, and call that the fixed portion usage and then break down the variable usage be estimates, and air conditioner, etc. may be based upon weather temperatures. . . .
at least that's how I did these types of graphs and forecasts during my finance career. .
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