[wdwduo]

Sar-Fred the transformer is located in the utility easement and I believe that you are prohibited from errecting anything in that easement.
As you are aware the transformer is owned by Seco. If you were to install insulation panels on the transformer, you could have the potential of causing damage due to heat build-up and Seco would undoutably bill you for any damage.
The safest couse of action is to continue to work with Seco. Let them make their engineering fixes before you take any independent actions. Get names and numbers at Seco and make them aware of your problem, often. You know the adage about the squeaky wheel.
LED