Texas is very much THE energy state. They are the number one producer of oil, natural gas, and wind power in the US. They are among the highest producers of total renewable power in the US as well. If it wasn't for hydroelectric (which Texas is not very suitable for) it would be the number 1 producer of renewable energy in the States. There are also significant levels of Nuclear power produced in Texas at 10% of it's total electrical generation capacity. Texas comprises roughly 1/3 of the US power grid and operates the only State independent stand alone power grid in the US. Texas produces 20% of the US's total energy output and produces twice as much electricity as the second highest producing state (Florida). The power grid is Texas is also extremely reliable and resilient even by American standards.
The state is also a huge technology sector (aerospace, chemical, semiconductor, and software) does a lot of manufacturing, and operates 2 trade borders, the Gulf ports and Mexico.