Generator Interlock Kits will keep your power on.

Generator Interlock Kits Panel-Specific, MET-Listed, Made in the USA

A generator interlock kit is installed directly into your existing breaker panel, and physically prevents both the main utility breaker and your generator breaker from being on at the same time. This mechanical separation prevents back feed to the utility line and meets NEC 702 requirements without a separate transfer panel or sub-panel. GenInterlock has panel specific kits for most major residential panels including Siemens, Square D, Eaton, Cutler Hammer, GE, Murray and more including many older legacy brands that most suppliers no longer carry. All house-brand interlock kits are MET-listed, made in the USA and ship free.