The 2016 Tesla Model S electric car will soon offer the 75-kilowatt-hour battery pack that debuted recently on the Model X crossover.
The addition was supposed to be announced later this week, but was revealed in an update of the California Air Resources Board (CARB) website Tuesday.
A 75-kWh Model S now appears in a list of cars eligible for the "white stickers" that grant solo carpool-lane access to electric cars and hydrogen fuel-cell vehicles.
Tesla subsequently confirmed plans to offer a 75-kWh battery pack on the Model S to Jalopnik.
Unlike in the Model X, the 75-kWh pack will reportedly be offered alongside the existing 70-kWh pack.
Tesla substituted the larger pack in its all-electric SUV before any 70-kWh Model X crossovers were actually built.
2016 Tesla Model S
The 75-kWh pack will add $3,000 to the current $72,700 (including destination) Model S base price.
Tesla expects the larger pack to add 19 miles of range compared to the 70-kWh pack.
The rear-wheel drive Model S 70 is currently rated at 234 miles of range by the EPA, while the all-wheel drive 70D is rated at 240 miles.
While the largest 90-kWh battery pack is offered with all-wheel drive only, the 75-kWh pack may get the rear-wheel drive option.
Tesla Motors production line for Tesla Model S, Fremont, California
That would swell the number of Model S variants to six, including the 70, 70D, 75, 75D, 90D, and the P90D performance model.
The new battery-pack option arrives shortly after the announcement of a number of upgrades for the Model S.
A new front-end design incorporates some styling cues from the Model X and Model 3, and the Model X's HEPA air-filtration system is now available as an option.
Tesla also upgraded the capacity of the onboard charger to 48 amps from the previous 40 amps, added some new trim options, and increased the base price by $1,500.