Electric cars are parked at a car charging station at the University of Maryland at College Park. (Sarah L. Voisin/The Washington Post)

Was the March 26 editorial “The Sheriff of Nottingham drives a Tesla” a surrender of the worthy policy goal of clean cars?

With due respect to the concerns of Severin Borenstein and Lucas Davis, why don’t we keep the $7,500 tax credit but limit it to electric-car owners who can prove they’re charging up on, say, 90 percent or 100 percent renewable energy? But wait, that might raise the equivalent per-gallon cost of fuel to 95 cents per gallon — that’s the equivalent gasoline price of driving on really clean electricity these days, for new sources.

Also, Tesla might have been a poor example in the editorial. Its pricey sedans and SUVs outsell other electric cars costing only about half or a third as much, whose owners can also receive the $7,500 tax credit. (I drive a Tesla.)

Indeed, the half-million (admittedly cancelable) reservations for Tesla’s new, less costly Model 3 suggest Tesla cars have not at all been “slow to catch on” — Tesla just can’t build them fast enough for all the Nottingham sheriffs and everyone else in line, at least not yet.

Ben Schlesinger, Bethesda

The next time I see a new electric car, I will congratulate the owner and thank him for sparing me the unpleasantness and the physical harm of breathing carbon-laced exhaust from gasoline- or diesel-powered vehicles. For a lower price, even with the tax break, the owner could have purchased a regular car, pushing the environmental and public-health costs on to me, a member of the breathing public.

I am delighted to see my tax dollars employed in promoting the growth of electric-powered vehicles.

David A. Korn, Washington