The second underground coal gasification experiment conducted by ERDA's Laramie Energy Research Center at a site near Hanna, Wyoming, was completed on July 30, 1976. During the experiment, production reached 0.32 thousand cu m/day (12 thousand CFD) of 6.9 MJ/cu m gas (175 Btu/cu ft). Approximately 6100 tons of coal were gasified during the experiment. Energy return ratios of 4.5 to 5.3, cold gas thermal efficiencies of 76 to 89%, and overall process efficiencies of 65 to 74% were achieved during the second Hanna experiment. The experiment and the results obtained are described with emphasis given to the determination of the energy recovered relative to energy consumed in conducting the test. Data from this determination are compared with previously published data from the first test conducted at Hanna during 1973 to 1974.