Sodium Batteries are the answer to the problem of Diurnal Mismatch in Renewable Energy, and as a consequence, they allow for a completely green economy.
But first: What is the Diurnal Mismatch? In short, it is the propensity for technologies like wind and solar energy to generate electricity only during certain hours of the day and night. Solar panels in particular only work during the day, while wind turbines have rather haphazard power generation that corresponds to the wind speed at any given point in time.
Second: What is Sodium Energy storage, and why does it solve this problem? In short, Sodium is a close cousin of Lithium. Both are next to one another on the periodic table, and both have similar chemical properties.
The bad news about Sodium Batteries is that they have much less energy density than Lithium, so they are not an appropriate replacement for Lithium-powered Electric Vehicles. This means that for the foreseeable future, Sodium will not revolutionize the mobile battery industry.
However, the good news is that Sodium batteries are incredible cheap to build and maintain, owing to the Earthly abundance of the material. And their large size and heavy weight does not preclude their use as a static storage medium. Excess renewable energy can be stored at Sodium-powered plants during the day, and then released into the power grid as needed at night.
That is why Sodium is the answer humanity needs. And if properly utilized, it will easily solve our energy demands well into perpetuity.
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