China can do things at a scale the West in general, and the US in particular can't even fathom.
I was in Tibet with some friends in October. At one point, our tour bus was detoured, because the bridge on our scheduled route wasn't big enough for it, so we drove a couple hours out of our way, and just happened to pass a 10MW solar plant. In the middle of Nowhere, Tibet. A thing we wouldn't even have seen if we hadn't had to detour down a dirt track road, still under construction (to the point that we had to stop and wait for the equipment that was carving the road bed out of the mountain face to clear enough room for our bus to pass). Who knows how many other such hidden infrastructure gems there are, down other roads that tourists don't get permission to use?
Later, we passed a seemingly endless convoy of dozens of fuel tankers and flatbeds loaded with construction equipment — all military green — headed south, as we were returning to Lhasa from Mt. Everest base camp. Doing some digging, it turns out this materiel was all accumulating at the Nepalese border.
See, just a week or two previously, Nepal had passed its new constitution, which favored closer ties with China over India. India, used to being Nepal's big brother and pushing it around, subsequently closed their border with Nepal — the border which, by treaty, was the only route through which Nepal could import fuel. Consequently, Nepal was starting to experience a ridiculous fuel shortage. (Talking with a taxi driver in Kathmandu a few days after having seen this convoy, the petrol rationing was down to 7L per family per week. Our flight from Kathmandu to Lhasa — about a 90 minute flight, going the long way, so people could get a view of Everest — was on an Air China A340, because they needed to send a plane that could carry enough fuel for the round trip, as there wasn't enough Jet A at KTM for the return.)
These convoys of fuel and construction equipment were waiting for a new treaty to be signed between Nepal and China, allowing emergency fuel imports from China. The purpose for all the construction equipment? The Nepalese side of the road that runs from Kathmandu to Lhasa was still destroyed from the Gorkha earthquake. The estimates I was reading suggested that, once the border was opened, the Chinese would be able to rebuild the road from the border to Kathmandu in about three days, and have fuel continually running down the repaired road as long as Nepal needed it.
China just happened to have the materiel on hand, in Tibet, to respond within days of India closing the border and Nepal going into crisis, with sufficient manpower, equipment, and fuel to rebuild a hundred-odd kilometers of mountain road in a few days and keep a city of a million people, and who knows how much of the rest of Nepal, from collapsing.
But they're completely backwards and corrupt, and have no idea what they're doing.