Delaware and some power companies are raising concerns over EPA's proposed air rule for reciprocating internal combustion engines (RICE) that operate under demand response (DR) programs, saying it could increase air pollution from higher-emitting backup diesel engines and deter investments in "cleaner" power generation. "Are we relying on dirty DR to replace retired coal capacity, instead of providing appropriate market signals to help develop cleaner alternatives?" asked Ali Mirzakhalili, director of the air division in Delaware's environment department, during a...