But development and deployment of technology is a function of available energy.
While there may be an abundance of energy (assuming you mean incoming solar) it is too diffuse to be really useful.
If, as I've said elsewhere, we had solar-cell factories actually powered by solar cells, that would be just great. As it is, the mining, refining and transport of raw materials are extremely energy intensive, even before we consider the manufacture of solar cells. PV is unable to support itself without inputs of concentrated (fossil) energy.
It's not a technology problem, it's a problem of limits.
As you say our financial system, based on assumptions of limitless growth, is definitely fucked.