That is, my 8500 watt generator only gives me 6800 watts with natural gas or 7650 watts with propane. K pessimistic than I am and they went with propane as the primary fuel. One even got two 1,000 gallon containers of propane. One thing nice about propane, one can store a considerable amount of propane safely above ground. Check with your local fire marshall for the requirements you need to meet.
Power generators are expensive and out of reach for most people.
For your local distributor of Kohler Power Generators, contact their authorized dealer which can be found through their search engine for home generator dealers. Kohler also makes generators for sale and rents generators for commercial use. I spent extra to have my generator anchored to a thick fiberglass platform which was anchored deep into the earth for security. The generator has a locked door on it. I reinforced the security with Kryptonite security cables and padlocks to a nearby tree as well.