If transformer exploded, neither water nor foam would save damage from initiating event. If combustible liquid, and liquid is sprayed into pea gravel, pool fire will be minimal. If liquid remains in transformer, the pool fire and/or spill fire is relatively small, fed by the oil reservoir next to the transformer.
The amount of fire damage saved by using foam versus water in this instance is small, especially considering: there are 3-4 hour FRR walls between the transformers to contain fire/explosion damage to unit of origin Responsible state/federal regulations would have required spill containment for these liquid cooled transformers. I like Ed's thought. If the transformers were open to the rain and snow, then what's the pain in throwing sprinkler water at it for cooling? Water, it is simpler, greener and costs less in this--and many an--instance. Great aerial footage, thanks for the link, Craig. Scot Deal Excelsior Fire & Risk Engineering gsm: +420 722 141 478 <+420%20722%20141%20478>
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