Wärtsilä's RT-flex common rail engine technology provides environmental benefits including low fuel consumption and reductions in exhaust emissions. The engine waste heat is utilized to produce onboard electricity. These features help maintaining and operating seaborne transportation in more economical and sustainable ways. Wärtsilä will supply the main engines for a series of vessels being built for Kuwait Oil Tanker Co. (KOTC), a Subsidiary of Kuwait Petroleum Corporation. Four VLCCs (Very Large Crude Oil Carriers), one Aframax tanker and four medium-range tankers are being built at the Daewoo Shipbuilding & Marine Engineering (DSME) shipyard in South Korea.