Recently, composite insulators have been increasingly employed mainly for economic reasons. We have developed a new type of outdoor termination using a composite insulator, which can be installed horizontally on a steel tower in order to reduce the construction cost. In this outdoor termination, SF6 gas is filled in the composite insulator and a cold shrinkable premolded rubber unit is applied instead of the combined use of a rubber-molded stress relief cone, epoxy resin insulator and spring unit. The application of the composite insulator, SF6 gas and cold shrinkable premolded rubber unit reduces the total weight and makes it possible to install the termination horizontally on the tower. The new-type outdoor termination for 77-kV XLPE cable has already been applied in commercial use and enabled a reduction of the construction costs for power transmission lines. A 154-kV new-type outdoor termination has been developed and its initial electrical tests were successfully completed. This paper describes the design and performance of both 77-kV and 154-kV new-type outdoor termination, and a follow-up survey of the 77-kV new termination in a commercial use. © 2007 Wiley Periodicals, Inc. Electr Eng Jpn, 159(4): 18– 26, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20511