The Carl Moyer Program can be used for engine repower and retrofit projects and components of the program such as the Off-Road Equipment Replacement Program (ERP) and the Voucher Incentive Program (VIP) can be used for equipment replacement projects.

Engine repowering is when an existing engine is replaced with a new one. The time it takes to repower an engine varies depending on the size and application of the engine. An engine retrofit is when new components, such as catalysts or filters, are added to an existing engine. Engine retrofits typically take a few hours, after which the engine can immediately be put to use. Equipment Replacement projects consist of replacing the entire unit (chassis and engine) with a new, cleaner piece of equipment.