For decades, installing E.V. chargers didn’t pay off for retailers. Now it does.

Now, new studies say retailers’ charging efforts may well be paying off: One peer-reviewed study by researchers at Boston University and the University of Wisconsin-Madison published this year looked at the impact of nearly 1,600 Tesla Supercharger stations in more than 800 U.S. counties and found a 4 percent increase in monthly visits for retailers within 200 meters of chargers after they were installed. The effects were most pronounced for retailers within 150 meters. The researchers also found a 5 percent increase in spending.