Delivered Cost of Fuel Calculations for Coal and Gas

The objective of this evaluation was to determine if the Tennessee Valley Authority's (TVA) delivered costs of fuel included all appropriate costs and were calculated consistently across commodities. We hired a consultant, Synapse Energy Economics, Inc. (Synapse), to (1) review TVA's delivered cost of fuel components and calculations and (2) research industry practices related to calculating fuel costs for dispatch purposes.In summary, in conjunction with Synapse, we determined TVA was making dispatch decisions using inaccurate cost information. The dispatch costs were inaccurate because TVA's delivered costs of fuel, which is the major component of dispatch costs, did not include all appropriate costs, were not calculated consistently across commodities, and were not calculated correctly. The errors we identified skewed coal dispatch costs up to 8.4 percent and gas dispatch costs up to 2.8 percent. In addition, other opportunities for improvement were identified related to inflation and escalation rates used in the delivered cost of coal calculations and the usage percentages assigned to each gas hub used by TVA in calculating the delivered cost of gas.(Summary Only)