This is practically incalculable, especially since there are so many variables involved. What kind of renewable energies? Are you talking worldwide or the US only? Do you mean 100% renewable? There are many considerations when coming up with an estimate. First and foremost is money into research and development, which could result in more efficient and less costly solar panels, for example. In general, renewable energies can flow through the grid well, but there needs to be better ways to store the energy, as wind and solar are inherently intermittent energy sources. And, of course, we need to actually build the solar and wind farms to provide the energy. These parts can be calculated separately, and the sum total is easily in the hundreds of billions or trillions.
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