In an average month, the Fremont Wood Chip Energy Plant generates 15,000 Mwh (megaWatt hours) of electricity by burning 20,000 tons of wood chips. The BTU (British thermal unit) value of the wood chips, or total energy that is released when burning wood chips, is 4,000 BTU/lb. Calculate the energy efficiency of the Fremont Wood Chip Energy Plant. Note the following conversions: 1kwh = 3,400 BTU (approximately); 1 ton = 2,000 pounds.