I tend to think the best way to assure system wide stability is to reintegrate the generators+transmission+retail portions to avoid all the perverse incentives. You know, the old public/CoOp utility model. Plus, the more you can keep politics and MBAs out of it, except to provide some guiding principals (aka lets try to reduce carbon, and keep costs low) the better off its going to be.
But realistically, politics in TX, so a solution that can be passed by the government is going to involve some kind of free market adjustment. Usually that is just to raise the power cap (now at $9000) further, but as recently proven it doesn't do crap either.
I said elsewhere let the engineers run it, but people assumed I was just talking about engineers, when really what I should have said is keep the decision making close to the people on the ground. If the plant operator thinks his plant needs some maintenance/etc he better not get overridden. Same with other bits, when the lineman noticed a problem with a pole, or an engineer runs a wind loading simulation and discovers a problem, if gets resolved rather than ignored.
What is a vastly more interesting question is what is the most perverse set of incentives the proposed system could result in, or what are ways the new system could fail, sometimes you never understand these until implementation, and only at that point is it discovered that most problems are not simple.
Your entire proposition is founded on the axiom that the free market is the ultimate good in running efficient systems, but the free market is reactionary (a way to fail) and the free market makes distinctions between owner class people, intermediary class people, and customer class people (misaligned incentives are a way to fail).
Fundamentally there is a disconnect between who pays for a water pipe that bursts and who pays to weatherize power plants, so you end up with a terrible set of incentives. Unless every owner of a burst pipe can successfully sue the power company for losses, I can't see a situation in which the free market would win over a well planned/regulated system.
We went to the moon. We built nuclear subs. The world runs on American technologies which are a major output of our institutions. We are one of the few countries with clean water running into our kitchen faucets. Strong, responsible, accountable institutions have proven to make this country great.
There are multiple potentially valid ways to do better than last time:
I am pretty unconvinced that the free market can offer efficient/acceptable solutions to disaster scenarios.