Looks like an air-handling unit caught fire. This is the result of poor maintenance. If a bearing gets too hot, it can ignite the oil used to lubricate it. I've seen this happen many times, especially on big wind turbines.

Looks like an air-handling unit caught fire. This is the result of poor maintenance. If a bearing gets to hot, it can ignite the oil used to lubricate it. I've seen this happen many times, especially on big wind turbines.