anyone can be liable for what they are responsible for, if a utility is responsible for supplying clean un damaging power, then anything out of that realm can be brought to court, remember the court will have the final say.
in any case they will have to prove they didn't cause it as much as you have to prove they did, preponderance of evidence is just that 50% one way or the other.
we have had two times now that the east side of our city was hit with a voltage surge exceeding the normal voltage that would be expected from the utility supply, it damaged a lot of equipment in many houses and also burned down one, they tried to claim, it was because of a lightning strike to a 69kv line as to why it fell down on a 7200 volt line causing the surge, well that didn't relive them of explaining why the surge lasted almost 15 seconds, and why it wasn't cleared by over voltage protection or over current protection, they still ended up paying.
Just because their connections/transformers fail doesn't relive them of the liability to provide clean un damaging power, they would have to prove the connections or the transformer wasn't over loaded, and was kept properly maintained.
This was one time the insurance actually went after the POCO, because of all the claims.
but most of the times they won't because it is just easier to pay for the damage with you paying the deductible, then fighting it in court, but you can, and for the same reason the power company will back down and pay, because its not worth the 50/50 chance of loosing.
many home owners use to just claim damage caused by an electrical problem, such as a lost neutral, as a lightning strike, insurance company's could not dispute it and would always pay, but they have gotten smarter, they now use the National lightning strike tracking network to dispute such claims, and most insurance companies wont pay if you have a problem in your electrical that causes the damage.
so it boils down to how much you have to prove your case against theirs. preponderance of evidence is just 50/50 to go your way or theirs.