Just had SuperCharging activated for $2500 + sales tax here in Washington. Wouldn't this fall under: Electric Vehicle (EV) Infrastructure and Battery Tax ExemptionsPublic lands used for installing, maintaining, and operating EV infrastructure are exempt from leasehold excise taxes until January 1, 2020. Additionally, the state sales and use taxes do not apply to plug-in electric vehicle (PEV) batteries; labor and services for installing, repairing, altering, or improving PEV batteries and EV infrastructure; and the sale of property used for EV infrastructure. Tesla seems to think "no" as far as they've told me - they say tax exemption can only occur if the feature was added with the original purchase. I would assume that this might fall under "service" but since it's not exactly directly related to servicing the battery, maybe no?