What are the welfare gains from upgrading electric vehicle infrastructure? This paper develops a model of electric vehicle charging location decisions incorporating the transportation network structure, allocation of travel, and the effect on electric vehicle demand. We estimate the model with rich data on vehicle registrations, road segments, cell phone tracks, and charging locations and characteristics. We examine a counterfactual that adds level 3 (direct current fast) chargers optimally in the Connecticut transportation network. We find that adding chargers yields significant time savings and consumer welfare gains, while electric vehicle market shares are only modestly affected.