Those scarce and expensive transformers are made in China.
I work for an electrical utility, and I can tell you that there are a couple of huge obstacles besides the actual means of generating “green” power, which also presents its own issues:
1. Getting generation connected to the grid takes years. There is a huge bottleneck in this process, called the generator interconnection backlog, and it is a real problem. The article touched on this, but I wanted to emphasize this reality.
2. We lack the means to transfer power to the scale that will be necessary to electrify everything. Power lines are like highways—they can only handle so much traffic before they become congested. Congestion causes lines to literally melt, which can cause fires and blackouts. We need more of these “energy highways”, but they are extremely expensive to build and take a long time to get done.