New York Codes, Rules and Regulations
Title 16 - DEPARTMENT OF PUBLIC SERVICE
Chapter II - ELECTRIC UTILITIES
Subchapter D - Rates And Charges
Part 138 - Penalties And Discounts-consumers' Bills-municipal Electric Utilities
Section 138.3 - Amount of one-time payment charge

If a one-time payment charge is imposed, it shall not exceed an amount equal to 10 percent of the first $10 of any bill, plus three percent of any amount of such bill in excess of $10; provided, however, that a minimum charge may be made of not to exceed 15 cents per bill; and further provided that there may be allowed in any block of a rate schedule a late payment charge of one mill per kilowatt hour of electricity or one mill per 100 cubic feet of gas.