Fire crews were called to put out the flames at an 11,000 volts pole mounted electricity transformer, in Bourton Westwood, following a reports at about 5.20am today.
Shropshire Fire & Rescue Service said crews and an Incident Support Unit from Much Wenlock and Tweedale tackled the blaze using a hose.
They left the scene shortly after 7.30am.
A spokesman for electricity firm Western Power Distribution said: "A line has come down that we think may have caused some flashing. We also have damage to a pole.
"Just 42 customers were affected and we have engineers on site. It should all be resolved by lunchtime."