No snark, but your question points to a fundamental lack of familiarity with the system.
In a nutshell, "power companies" encompasses several types of different economic entities; especially since market reforms emerged in the past 20 years. Essentially, vertically integrated utilities were encouraged to split off those business segments where effective competition could be brought to bear.
Transmission, generation and ancillary services were some sectors that now have significant private ownership instead of public utility ownership.
All types of ownership are still tightly regulated at the state and federal level.
If any segment or provider of services can't continue to compete in a condition where the need still exists, they will either be replaced, reorganized, or eliminated - just as they've been for the past 75 years.
Will there be government subsidies involved?
Absolutely. Whether those subsidies involve supporting forward thinking investments or backward looking pork will depend (as now) on politics.
But mostly the process should be one of evolution. Business planning usually isn't done in accordance with blind ideological fervor. One of the lesser known tricks of policy is that more than being strictly proscriptive, it uses proscribed changes as a way of showing businesses the path forward. Early adopters that exceed incremental mandates are common.
For example, if you look into it, you'll find strong industry support for the Clean Power Plan among large power users and many, many utilities. They will continue to use that as a template for what the future holds no matter what flimsy roadblocks the energy oligarchs manage to erect.
The economic tide is bringing in a low carbon global culture. There is nothing I can envision that can derail the change.
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