There is such a thing as a tri-fuel generator (gasoline, LP, & NG), or at least there used to be. So I would think that just switching between LP and NG would be do-able. I don't know of any off the top of my head, but I would probably ask someone at Generac.

bp
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On 4/7/2016 11:04 AM, George Skorup wrote:
We're going to be putting in one of the Generac 1800RPM quiet models at our office (so the neighbors won't bitch too much about the noise of a 3600). So here's one of the potential problems we're worried about, because it happened. They shut off the natural gas after the tornado last year because houses were blown away and gas was leaking everywhere. If that were to happen again, then our shiny expensive new generator will be sitting there doing nothing. So we're thinking about doing a LP tank as backup, but would like to have the primary be NG. Has anyone done this? Two regulators and valves perhaps? I don't have a problem manually turning some valves, but I don't wanna be out there at o'dark:30 in the rain doing plumbing.

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