Level 2 Loop

The Proof

40 Sprague St, Boston, MA 02136

Max power: 7.7 kW; Level 2
Charging ports: 64; J1772
Price: Price not listed; Per network listing
Hours: 24/7; Open all day

The Proof is a Level 2 station run by Loop at 40 Sprague St in Boston, MA. It has 64 charging ports with J1772 connectors and delivers up to 7.7 kw. Pricing is set by the network app, and the site is open 24 hours a day.

How long will charging take?

Range added per hour

~25mi

10% to 80%, 77 kWh battery

~7.8hours

Estimates for a typical long-range EV. Real times depend on your car's maximum charging rate, battery temperature, state of charge and whether power is shared between neighbouring stalls. How charging speed works

Connectors and compatibility

J1772

64 ports · 8 kW

The universal Level 2 AC plug in North America.

Works with: Every non-Tesla EV and plug-in hybrid. Teslas charge with the J1772 adapter that ships with the car.

Pricing

Price not listed

Prices can vary by time of day and membership. The Loop app shows the live rate before you start.

Location and access

Address: 40 Sprague St
Boston, MA 02136
Coordinates: 42.23610, -71.13857
Hours: 24/7
Phone: 888-385-6671
Network: Loop
On site: 24/7 Access

Questions drivers ask

How fast is The Proof?

It is a Level 2 station delivering up to 8 kW, which adds roughly 25 miles of range per hour. It suits charging while you shop, work or stay overnight rather than a quick road-trip stop.

How much does it cost to charge at The Proof?

Loop has not published a fixed price for this site. Rates are shown in the Loop app or on the charger screen before you start a session.

What plugs does The Proof have?

64 × J1772 (Type 1) up to 8 kW.

Is The Proof open 24/7?

Yes, the network lists it as open 24 hours a day.

Source: U.S. Department of Energy Alternative Fuels Data Center (AFDC), station ID 453268. Last confirmed by the network on Jul 15, 2026; opened Dec 15, 2025.