Renewable energy is really based on mother nature (Solar, wind and even water).
If you alluding to that renewable energy is depends on mother nature, then that is known and obvious to anyone
I assuming that your talking about the situation in 2021
Electric grid regulators said the U.S. will have to develop vast supplies of power storage — such as gigantic batteries — that rely on emerging technologies.
www.nbcnews.com
Fact one - Solar and Wind still only provide a small amount of energy as compared to traditional sources
two - Solar and wind depends on the availability of it where it will be installed. So areas that do not get the minimal amount needed for Solar or wind power to be feasible do not use it.
For example in homes, The house must have a certain amount of sun light that hits the roof for them to even install it. If you have trees then they may need to be cut
Three - Renewable energy is still pretty new and not an established source that has been around for decades. The point technology will improve it over time
The Texas JOutage
generally
renewable energy is just about 25% and the rest is the more traditional sources
A Review of the State's Current Traditional and Renewable Energy Capabilities
comptroller.texas.gov
The storms that hit Texas took out power in both renewable and traditional sources
In Texas, the center of a wave of outages across the Southern and central parts of the U.S., the primary electric grid suffered a one-two punch wrought by the deep freeze: off-the-charts demand for power as Texans tried to heat their homes and power plants that simply failed to produce power when people needed it the most.
Wind and solar, still fairly small slices of the state's energy mix, played only a minimal role in the sudden power shortage, utility officials said
Conservative interpretation is that it was just renewables energy that was affected. Traditional sources also were effected. Also because people panic, then they contribute to the increase in demand which was also a factor. The stress on traditional sources failed also. They do provide about 70% of power for the state.