Clean Transition Tariff (CTT)

A Clean Transition Tariff (CTT) is a voluntary electricity pricing arrangement that allows large energy users to help fund new clean power projects, such as advanced nuclear, geothermal, or long-duration energy storage. By paying the additional cost themselves, participants accelerate deployment of emerging low-carbon technologies without shifting costs to other customers. The first publicly announced CTT formed part of Duke Energy's proposed Accelerating Clean Energy (ACE) tariff framework, unveiled in 2024 in collaboration with Amazon, Google, Microsoft, and Nucor.