When we purchased our house 12 years ago, there was almost a full section of pasture behind our house---surrounded by town. Farmer had it, ran a few hundred head of cattle. Then he passed, and his kids sold the ground to developers. Around 2020, they started clearing the land and doing all the excavation work for streets, utilities, etc.
I watched the guys with the boring rigs do what you described. Dig a hole about 4 foot deep, run the boring machine in that hole, and have it come up around 100 feet away. Then repeat the process. They ran 4 inch or so conduit in the ground, then pulled copper through that, then stuck a transformer (or whatever that is) where they had each hole. Then as the ground was being prepared for a slab, another contractor would dig a trench from the transformer to where the power was going to enter the house.
Same technique that ATT and the cable company was doing, just with larger conduit, and deeper trenching.
The contractor doing the water/sewer/storm drains for the city took a helluva lot longer, due to having to trench everything.