Yeah sorry, poor wording. What I meant was companies only get investigated when they are negligent or breaking a law, and only if they get charged do we get information about it.

Government departments will do internal investigations and then the results are accessible under the Official Information Act, regardless of outcome, so we tend to get more info if it’s government.

But on thinking about it, Transpower are probably keen to give people an explanation if it was some freak accident to protect their reputation, so we may find out anyway.