It doesn't.
The sun provides about 300W/m^2 on average at temperate climates, that's 7.2kwh per day. Wheat takes about 4 months to grow and nuclear power costs 0.77c/kwh.
That's 665.28$/m^2 at wholesale.
[0] https://ag.tennessee.edu/solar/Pages/What%20Is%20Solar%20Ene....
[1] https://en.wikipedia.org/wiki/Electricity_pricing#Price_comp...