The good news is, the power council concluded those forecasts overstated the problem. The council concluded that under normal circumstances we might have enough power over the next few years. But everything depends on luck. A reliable generating system has to be sufficient when luck turns bad. In 1989, for example, luck turned bad, and we narrowly averted blackouts.
Power engineers try to keep the odds of blackouts very low.
But the power council's analysis shows the odds have become uncomfortably high. In the real world, bad luck happens. So, we need more generating capacity. The only viable source for large quantities of new power is natural gas turbines. Several turbine plants are in the works but completion is years away.