June 2016: Vacatur of Portions of RICE NESHAP and NSPS Provisions for Emergency Engines

Owners of emergency use only engines should be aware of a recent court case (2015) that may affect the emergency use only status if they are participating in an emergency demand response program or operate the engine in order to mitigate voltage/frequency fluctuations effective as of May 2016. Guidance on Vacatur of RICE NESHAP and NSPS Provisions for Emergency Engines [PDF].