The Maryland Transportation Authority is going to start charging E-ZPass customers a monthly fee of $1.50 to use the service. As part of a cost-recovery initiative approved in January by the authority’s governing body, E-ZPass customers also will pay $21 to $40 for new and replacement transponders. New customers will pay a $25 prepaid deposit. An administration fee for unpaid toll violations increases from $15 to $25. The changes are part of an effort expected to generate $60 million more a year for the self-sustained agency as costs increase and toll traffic and revenue drop. In May, vehicles with more than two axles began paying higher tolls on several highways and bridges.