No real need for the tungsten rods to be the size of telephone poles, for 98% of things you want to destroy."Project Thor is an idea for a weapons system that launches telephone pole-sized kinetic projectiles made from tungsten from Earth's orbit to damage targets on the ground."
A 100 lb tungsten-carbide rod with an impact velocity of 146,667 ft-sec(about 100,000 mph) would deliver 33,440,468,172 ft-lbs of energy, assuming my calculations are correct.
Even with "only" an impact velocity of 25,000 mph, it's still an energy delivery of over 2,000,000,000 ft-lbs.