I have attached a video of just how one delivers concrete to an area that doesn't have road access, either due to the topography or to environmental concerns. The helicopter may make dozens, even hundreds of trips like this in a day depending on the distance between the fill and pour sites. The pilot has to be precise in placing a two ton object among individuals many feet below him, otherwise it'll be a bowling ball among the pins.
The ground crew need to be mentioned, too. They're the ones in the unsexy ground role, fighting the rotor wash, the heat, the bugs, the dust, and the danger. They're unsung heroes, rising at dawn and using their muscles and brains in all types of weather to, in this case, help rebuild the national electric grid. You won't find them on Instagram, YouTube, Twitter, or SnapChat but they're out there, unheralded, supporting their families and the tax base.