FRANKFURT, March 25 (Reuters) - Buyout firm EQT is preparing to launch the sale of German energy services firm Getec after the summer break and has mandated an investment bank to oversee the process, people familiar with the matter said. EQT, which bought a 60% stake in Getec in 2016, is working with Morgan Stanley on the sale, expected to be worth several billion euros. Utilities and infrastructure investors are being targeted as potential buyers of Getec, which supplies heat and electricity to industrial and real estate clients such as shopping malls. EQT and Morgan Stanley declined to comment. (Reporting by Arno Schuetze. Editing by Mark Potter)