(Power put on lines - expected transmission losses) * billed cost of power - customer payments. I hope for the sake of their billing department they're using a

(Power put on lines - expected transmission losses) * billed cost of power - customer payments. I hope for the sake of their billing department they're using a database and some customized software for the data, but could just as likely be in a large and painful excel spreadsheet. Power theft is not particularly interesting to the power company unless they're not getting paid for it. If it's just the wrong person paying, that's their problem.