It's $56B, not $5.6B.
The high costs of the renewable electricity plants in Germany were caused by paying high price for the early models solar panels and due to over-complicated permits for building anything. In Germany, 40% of electricity comes now from renewable sources, in USA only 20%. In Spain, renewable energy accounts for over 46%,
How much will it cost us to save $56B?
In any case, I'm not too sure of the savings if you look at Germany. Why do you think America, Canada, or any other country could do it better than the efficient and technically oriented Germans? If they screwed it up, there's not much hope for us.
Look at Texas which has more wind generation than any other state, interesting in itself since it's an oil state. But they lost power across the state a year or so ago for stupid political and design decisions and could lose it again. Do you think New York State where I grew up and lived until recently is any smarter? They shut down nuclear plants. And now they are going to build offshore wind that will require fossil fuel backup for when the wind stops blowing. How do two plants instead of one save construction money? Think of the maintenance costs when they have to send a repairman in a helicopter or a chartered boat over the ocean burning diesel.