[CSB]

Remember this destroyed power generation unit at the Sayano-Shushenskaya Dam in Russia?

In that case the official reason for the destruction was a simple "overspeed" of one of the turbines. When there is the mass of five or six M1 tanks spinning over 200 rpm, it has to be perfectly balanced and well lubricated. If malware were to shut off the lubrication, vary the loads and get the generator out of phase with the other transformers, or even close the water valves too quickly (creating a water hammer) the result would be equally destructive. It would be destroyed without a blasting cap, or a single block of C4. In fact, it would be almost impossible after the fact to reconstruct exactly what caused the turbine to break loose.