"Why we should continue burning fossil fuels as long as we can while we trying to figure out energy storage solution. Sure it might never come, or we might boil the oceans before we figure it out, but on the upside the government will save a bit of money, and saving money is what's important."
New energy storage facility capable of storing enough energy to keep a small city going through the night takes [NaN] to build. Because it doesn't exist. There is a number of probable solutions that might need to nowhere, and if they don't, they need unknown amount of years to even go to the first commercial prototype. All the while we will be burning foccil fuels and enriching the same people who brought us to this mess.
Moreover, 15 years is a time to build your first nuclear power plant if you are in isolation and you start from fundament recearch. Thankfully the world is interconnected, and the engineering of the regular nuclear plant was perfected decades before you were born, so I strongly suspect the time will be way better.
It will be expensive, way more expensive than continue to burn oil, and shareholders of oil companies will be very unhappy. But I hope I don't need to tell you why it's not a good argument