Fully contained unit, with 2004 Cummins diesel power on a 53.6 kw generator. Originally designed as an 80 kw 3-phase, but converted over (at a sizeable expense) to single phase to be used for a ranch, farm, municipality, or other group that could use a good backup unit. A new one will cost around $95k. Some highlights include only 151 starts (tracks info in the monitor), cummins from 2004 woth less emissions making it VERY desirable compared to newer units with more emissions control. Has a built in 300 gallon fuel tank at the base of the unit. Runs off diesel. Runs 120/208 up to 277/480. It has auto features allowing it to be used in an emergency setup, and eas originally designed to be backup power for a hospital. Has extras, like the tilt lid, the exhaust piping to run while lid is down, a fill pipe for refilling the diesel tank, and more! For those looking to be protected, off grid, or just looking for some peace of mind, this is a GREAT solution!