How does MUD's 'budget plan' billing work?

Prices seem to be rising everywhere we look. One talker lately: Water and gas bills from the Metropolitan Utilities District. Some customers say they've seen a surprising increase in their 'budget plan' billing, which is adjusted annually in order to keep the bill consistent from month-to-month. MUD announced its 2023 budget and projected annual cost increases, for the average user, of about $26 for gas and $18.50 for water. But some with those budgeted plans noticed their recent adjustments are more than that each month, and much more over the course of a year.