Tesla has revealed a $10.1 billion proposal for a solar factory in Texas, offering the clearest look yet at how CEO Elon Musk could pursue his ambitions to ramp up solar manufacturing in the US, documents show.

In a tax-incentive application filed in Texas, Tesla proposed a solar factory, code-named Project Crystal Sun, that would be built in Fort Bend County, southwest of Houston. The application said the facility would be expected to begin commercial operations in the first quarter of 2029 and employ more than 9,700 people full time.

The application doesn’t detail the factory’s gigawatt output capacity, but cites a statement Musk made at the…