A techno-economic and environmental analysis of co-firing implementation using coal and wood bark blend at circulating fluidized bed boiler oleh Nur Cahyo, Desy Sulistyowati, Mujammil Asdhiyoga Rahmanta, Muhamad Iqbal Felani, Mochamad Soleh, Paryanto Paryanto, Adi Prismantoko, Hariana Hariana