Since 2007, the use of infrastructure investment cost recovery mechanisms has tripled. Today, 47 utilities in 22 states serving 24 million residential natural gas customers are using full or limited special rate mechanisms to recover their replacement infrastructure investments, and 5 utilities have mechanisms pending in another state and the District of Columbia. This updated report describes these mechanisms, as well as the legislation and generic regulations implemented by ten states that give utilities in three additional states the authority to use innovative mechanisms to recover new and replacement pipeline investments.