Bottom line -
1. It is being mandated that alternative sources be used as a means to deliver a share of the power.
2. What was predicted and stated as needed to meet future demands was more than what is being built. Only 3 of 11 power plants are being built.
The world was also fine and OK until they had rolling brownouts in California. They did the exact same thing. They built wind turbines in the North, they said “no” to new coal, gas, or nuclear plants for years, and eventually they were left with a small disaster which those largely responsible then blamed on those who warned them ahead of time of the looming problem (Perot Systems) and those from whom they were buying their delta in power.
And TXU marketing campaign to play public opinion to get what they wanted in the first place is not proof of your claim either. Building Natural Gas plants instead of coal plants is still providing generation.
The tables of demand growth and planned generation are in the links I provided. Where is the shortfall you claimed?