Frank Schuman, an American inventor, designed a way to use concentrated sunlight to create steam to drive a turbine to generate electricity in 1910. It did not get accepted in the US, because cheap was being burned to make the steam

coal

Explanation:

Frank Schuman's solar power invention to create steam that will drive the turbine to generate electricity was not accepted in the United State back then because coal, a non-renewable energy source, was available for cheap and can easily be burned to generate steam.

Since the coal was readily available for cheap and back then, the deposit was huge to the extent that no one was thinking that it could get exhausted one day or the environmental pollution created through its burning, the invention of Schuman did not get the desired attention.