Westinghouse experience with land-based gas turbines started as early as 1945 with the development of a 2000 hp (~1500 kW) gas turbine generator set, the W21. It had a thermal efficiency of 18% (LHV). The first application of the W21 in an industrial setting was in 1948 as a gas-compressor drive installed at the Mississippi River Fuel Corp. facility located at Wilmar, Arkansas.[https://richesmi.cah.ucf.edu/omeka/files/original/cddb252b6f856e57afa2326ecfcfb9bd.jpg] Reports have it that this was the first industrial gas turbine in the world to accumulate 100,000 hours of operation before it was retired.