Generation 1 Chevy Volt (2011-2015)
http://fuelfix.com/blog/2014/05/14/texas-launches-2500-incentive-for-cng-electric-vehicles/
http://www.tceq.texas.gov/assets/public/implementation/air/terp/ld/2014_ld_list.pdf
I just read on the on the Houston Chronicle about new $2500 incentive for alternative fuel (including electric) cars...