Well, how big is Yemen?
You want to confine the effect to your target.
They use electricity? What, electric camels? (And, goats?)
I believe we dropped metallic chaff onto Iraqi power lines to short them out for localized power outages in Iraq.
Sometimes you want to keep the water running while shutting down the radar installations.
Several strategically placed and detonated simultaneously over Iran may prove to be extraordinarily effective....
All with little or no damage to the real estate or even to most of the people on the ground.
I should hope that countermeasures are ready to be set up and deployed at earliest opportunity.
Then you actually have to attack a target that has modern electronics. I’m not sure Yemen qualifies.