Original Response: Sorry, that credit expired at the end of 2016, so it is not valid on your 2017 tax return.
https://www.irs.gov/credits-deductions/individuals/alternative-fuel-vehicle-refueling-property-credi...
Edit: On February 9th, 2018, Congress retroactively extended this through 2017. It will likely take several weeks for the IRS and TurboTax to get the Forms ready for that, so you may want to wait to file your tax return. The other alternative is to file now without it, then amend your tax return later to add the credit.