The Maine stove incentive program run by Efficiency Maine ended in December of 2018 but it may come back in 2019. The program provided a $500 rebate for pellet and wood stoves that were 75% efficiency or higher, but the efficiency had to be listed on the EPA list of certified stoves. In 2017, the program only provided 100 rebates but due to more aggressive outreach, they provided 700 rebates in the first half of 2018. Of those, two thirds of the rebates went to pellet stoves.
If you believe this was an important program, please contact Efficiency Maine to encourage them to reinstate it.