Summary: Annual filing by Avista Corporation to review and confirm power cost deferrals in the 2015 Energy Recovery Mechanism. In sum, power costs were lower than the 2015 baseline by approximately $17.6 million. This was primarily due to reduced thermal fuel expenses and a reduction in the short-term market power purchase price. This increased the deferral account in the rebate direction by $11.5 million, including $215,000 in interest, to a total of $18.0 million.