Continue:
So, we now have Tesla.
Nevada DID provide 1.3 B in defered taxes for that area. 
In return, Tesla is to build their 30 GW battery factory. In addition, they had to promise to hire 5000 workers with decent pay. Since that time, GF has grown in size. It will now be doing 150 GW of batteries, while getting lithium from nothern mexico and nevada itself (also looking at several other states and extraction process). That GF is already employing over 10,000 workers, though 2000 of them are construction. 

Tesla has collected over .5B in envir credits from other car companies. Why? Because California was going to require that car makers have 10% of their sales be clean (EVs, nat gas, or h2). The car makers fought that and THEY came up with the credit idea. 
They also speak about the federal/state credits for EV declaring them essential. However, in a $75-150K car, even 10K does not matter. It DOES matter for cars under 35K. Again, these credits started AFTER Tesla was off the ground