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When it comes to refueling a car, drivers of gas- and diesel-powered vehicles have it easy. They roll up to any one of about 100,000-plus gas stations in the U.S., pump in liquid fuel in a matter of minutes, and pay either in cash or with a credit card. Unfortunately, it’s a little more complicated with public charging for electric vehicles—although remember that almost all EV charging takes place at home, which usually requires about 30 seconds to plug in each night.
For EV drivers who want to regularly charge in public, it’s important to know about the handful of charging networks offering access to electric fuel on the go. Each network works a little differently. It’s a good idea for EV owners to have a basic understanding of how they compare with one another. That’s why we put together this basic guide on EV charging networks. It’s a work-in-progress, and your input and feedback is encouraged.
The three primary approaches are: (1) pay-as-you-go, (2) monthly subscriptions, and (3) free. Obviously, if given the opportunity, it makes sense to grab a free charge, even for a relatively short period of time. But the pay models, depending on the cost for a charge, need to be studied to determine which network makes the most sense for you; if it’s best to collect a wallet-full of membership cards; or if proper planning will allow you to avoid public charging unless you’re running very low on charge.
There are a few gotchas. Keep in mind that the amount of range you add per hour depends on the power capabilities of your car’s onboard charger. As Marc Geller, a director at Plug In America, an EV advocacy organization, told me: “If the car comes with a smaller charger, the cost is relatively higher than if you have a faster charger. It’s a weird fact.” Other oddities include credit card transactions and costs associated with leaving a car plugged in, even if the battery if fully charged and the electrons have stopped flowing.
Networks, such as eVgo, operated by NRG Energy, avoid some of these issues by using an all-encompassing all-you-can-charge subscription service. That brings clarity, but usually at a higher overall cost. As of July 2014, the majority of public chargers are still available for free (although not every system makes it absolutely clear how much EV drivers are paying to charge).
One last caveat: The terminology of ''station” can be confusing and misleading. Some services call each individual charger a station, when the term station usually refers to a single public site with the capability to charge more than one car at a time.
Background: Aerovironment, known as AV, is a pioneer in the development of electric vehicle charging technologies. The company sells a range of Level 2 and Quick Charge equipment, but also operates its own network of chargers.
Approximate Number of Sites: 60
Coverage: AV’s chargers, many of which are DC Quick Chargers, are primarily located in Oregon, and to a lesser extent, in Washington State—as part of the “West Coast Electric Highway.” AV also has a handful of charging locations in Hawaii.
Access: Unlimited monthly access is provided for $19.99 per month. Subscribing to the AV network starts with calling 888-833-2148 or filling out a form on AV’s website. The company will send a key fob that activates the chargers. If you are a current subscriber there is no activation fee. If you are a new subscriber, there will be a one-time activation fee of $15.
Cost per charge: As an alternative to the flat monthly access fee, there is the option of paying per session: $7.50/session for DC Fast Charger; and $4.00/session for a Level 2 charging station. (Per session payment is only available by calling the Customer Service Support Line at 888-833-2148).
Website: http://evsolutions.avinc.com/services/subscriber_network 
Tech Support: 24/7 support at 888-332-2148. AV can also be emailed at email@example.com .
Background: The assets of Blink Network were purchased by CarCharging Group in October 2013. Ecotality had received a $114.8 million federal stimulus grant to oversee The EV Project. The goal of The EV Project is to deploy 8,300 private and public chargers. There have been several reported problems associated with Blink chargers, and the Blink Network, such as insufficient customer support, and incompatibility of the equipment with certain vehicles.
Approximate Number of Sites: 1,680
Coverage: Blink Network chargers are located in approximately 25 states, with the largest concentration in California, Arizona, Oregon, Texas, Tennessee and Washington.
Access: Start by registering a credit card with a Blink account. There are no required annual or monthly membership fees, or minimum credit card balance. Members who register will receive an “InCard” and can initiate a charge using the card. Guests can initiate a charge with Blink’s mobile application.
Cost Per Charge: In the states that permit kilowatt-hour pricing, fees for Level 2 EV charging stations owned by Blink and operated on the Blink Network range from $0.39 to $0.79 per kWh, depending on the state and individual’s membership status. Blink is a proponent of kWh pricing because it is usage-based and EV drivers pay fees based on the actual amount of power consumed during the charging session rather than the amount of time that the car is plugged into the station.Fees for DCFC chargers owned by Blink and operated on the Blink Network in kWh eligible state range from $0.49 to $0.69 per kWh, depending on the state and individual’s membership status.
These states currently permit fees by the kilowatt-hour: California, Colorado, Florida, Hawaii, Illinois, Maryland, Minnesota, New York, Oregon, Utah, Virginia, and Washington, as well as the District of Columbia.
In states where pricing by kWh is not permitted, time-based charging fees for Level 2 charging stations owned by Blink and operated on the Blink Network range from $0.04 to $0.06 per minute, depending on membership status. Time-based charging fees are rounded up to the nearest 30-second interval. Fees for DCFC chargers owned by Blink and operated on the Blink Network in non-kWh eligible states will range from $6.99 - $9.99 per session, depending on membership status.
Website: http://www.blinknetwork.com 
Technical Support: 24/7 technical support at 888-998-2546.
Background: Chargepoint, previously Coulomb Technologies, describes itself as the largest online network of independently owned EV charging stations operating in 14 countries. The company provides a turnkey EV charging solutions for property owners—who can determine the terms for offering charging to EV drivers.
Approximate Number of Sites: 3,084
Coverage: While one-quarter of ChargePoint stations are in California, the network is the most widely distributed with at least one station in approximately 43 U.S. states.
Access: There is no cost to sign up and receive a ChargePoint card. After submitting your credit card information as part of the sign-up, you will be charged an initial deposit of $25 only when you first visit a charging station that requires a fee. (Many stations on the network are free.) Your account provides access to all public stations on ChargePoint. Charging stations are activated with the ChargePoint card, or a contactless credit card. The stations can also be activated by calling a toll-free customer service number on the ChargePoint station, or by using the associated mobile app. Account balances automatically replenish when the balance gets low.
Cost Per Charge: Prices are determined by the property owner. Many ChargePoint stations are currently free.
Website: http://www.chargepoint.com 
Technical Support: 24/7 customer support at 888-758-4389, with more robust technical support available 8 am to 5 pm eastern.
Background: The Electric Circuit is the largest public charging network in Québec. It is a major initiative providing the charging infrastructure required to support the adoption of plug-in electric vehicles in Québec. Since its launch in March 2012, 85 private and institutional partners have joined The Electric Circuit and the network has now some 350 public charging stations in operation.
Approximate Number of Sites: 223
Coverage: Charging stations are located in near 90 municipalities throughout 15 regions of Québec's province.
Access: There is no cost to sign up and receive an Electric Circuit card. When you first order your Electric Circuit card, you will be charged $10 (tax included), which will give you four charging sessions at any 240-V station or a 1-hour charge at any fast charge station. You will then be able to add the amount of money to your account as you wish.
Cost per charge: The rate for a 240-V charge is a flat fee of $2.50 (tax included), no matter how long you use the charging station. As of October 1st, 2014, fast-charging is offered at $10 per hour and billed by the minute. This rate applies to all existing and future fast-charge stations of the Electric Circuit.
Website: http://www.lecircuitelectrique.com/index.en.html 
Tech Support: Electric Circuit users have access to a 24/7 telephone helpline run by CAA-Québec (1 855 999-8378) as well as a charging station locator service. The Electric Circuit Web site, theelectriccircuit.com, and the mobile application for iOS and Android are updated as new stations are installed or commissioned.
Background: eVgo is subsidiary of NRG, a Fortune 300 and S&P 500 company. It’s one of the country’s largest power generation and retail electricity businesses, with power plants producing about 47,000 megawatts of generation capacity. eVgo is part of NRG’s clean energy portfolio, which includes solar, thermal, and carbon capture technology.
Approximate Number of Stations: Approximately 150, each with Level 2 and DC quick charging options.
Coverage: Currently, eVgo operates stations in Texas, in the Houston and Dallas-Fort Worth markets, as well as Tennessee, California and the greater Washington, DC area.
Access: NRG’s network is only available to its monthly subscribers using an eVgo card, but as its website states, the company “will always take care of an EV driver in need of a charge.”
Cost Per Charge: eVgo offers various plans based on the needs of an EV driver and the electric vehicle they have chosen. This is an overview of their three most popular all-you-can-charge plans. Starting at $30 a month, with a one-year service agreement, EV drivers have access to unlimited charging at the company’s so-called Freedom Station sites, which includes Level 2 and DC fast charging. The $40 a month Home plan, with a three-year service agreement, adds installation of your own home charging equipment—but not the cost of electricity that is separately metered. The Workplace plan is $30 a month. See the pricing structure , which is unique to each region.
Website: http://www.evgonetwork.com/ 
Technical Support: Contact firstname.lastname@example.org .
Approximate Number of Sites: 270
Coverage: 32 states, DC and Puerto Rico.
Access: WattStations require an RFID card, even when non-networked and free.
Cost Per Charge: Prices vary, as established by owners.
Technical Support: Unknown
Background: Greenlots is not formally a network, but rather a provider of open standards-based technology solutions for various stations and other networks. Designed to answer the needs of site hosts offering workplace, utility and public charging applications, Greenlots’ SKY platform utilizes Open Charge Point Protocol (OCPP), the largest open standard for charger-to-network communications.
Access: Users have many access options, including: (1) Download the free Greenlots app from iTunes or Google Play. Next, enter your credit card information. Once your information is saved, select "Charge" from the menu and enter the Station ID or scan the QR code displayed on the front of the station; (2) Swipe your Greenlots RFID card; (3) Call the customer care number listed on the station to have the charge session started remotely; and (4) Some stations have a credit card swiper. Users can also create a driver account at www.charge.greenlots.com  to track electricity usage, update information, or order an RFID card.
Coverage: No specific region. Charging stations in Midwest, Northeast, Northwest, South, and Southwest, as well as Hawaii, Canada and Singapore.
Cost Per Charge: Site hosts determine the fee for use. Greenlots does not charge a membership fee.
Website: http://greenlots.com/ 
Technical Support: The 24/7/365 customer care team can be reached at 855-900-7584. Less urgent inquiries can be sent to email@example.com .
Background: Maryland-based SemaConnect offers Level 2 commercial grade EV charging station equipment and management software called SemaCharge. Their focus is on making charging as easy as possible for EV drivers and station owners. The company says it’s the fastest growing network on the east coast. SemaConnect is the third largest supplier of commercial grade Level 2 charging stations based on number of stations deployed.
Approximate Number of Sites: 450
Coverage: SemaConnect stations are located in about 20 states, with the greatest concentration in Maryland, Virginia, Washington, DC, Georgia, California and the Pacific Northwest. It also has a presence in Puerto Rico.
Access: To sign up, log on to the SemaConnect website, and open a new account with a $20 balance charged to a major credit card. You will receive a “SemaCharge Pass” RFID card that can be used to initiate charging at any SemaConnect location. If the balance drops below $0.00, the associated credit card will add another $20 to your account. SemaConnect also offers mobile payments via its smartphone application, toll-free number, or via a QR code scan.
Cost per charge: The cost varies, as determined by the property owner.
Website: http://www.semaconnect.com 
Tech support: Available 9 am to 5 pm EST at 800-663-5633.
Background: Shorepower Technologies manufactures, sells and operates equipment for truck stop electricity services, as well as electric vehicle charging equipment. Most of the truck stop sites have standard charging outlets (e.g., NEMA 5-20, NEMA 14-30 and NEMA TT-30), accessible to EV drivers with the appropriated adapter cords. Relatively few of the locations also have charging stations with standard J1772 connectors.
Approximate Number of Sites: Shorepower has about 425 locations, with more than 2,000 individual connection points.
Coverage: Charging locations, mostly at truck stops, are spread widely across the U.S. in approximately 30 states.
Access: Use the toll-free hotline, kiosk or web browser to activate service via a credit card. There is a $1 activation fee.
Cost per charge: For paid stations at Level and Level 2, the fee is $1 per hour. Locations with J1772 equipment, mostly on west coast, are free.
Website: www.shorepowerconnect.com 
Tech Support: 888-841-3137 or send email to firstname.lastname@example.org .
Background: In fall 2012, Tesla Motors, the makers of the Model S sedan, rolled out its first so-called “Superchargers,” in order to make road trips available for free to owners of its sporty luxury sedan.
Approximate Number of Sites: As of July 2014, there are about 104 available Superchargers.
Coverage: Supercharger stations are situated throughout the United States.
Access: Tesla Superchargers do not require a card to initiate. Model S owners simply drive up and plug in. The chargers are available to owners of Model S models with the 85 kWh battery pack, or cars with the 60 kWh pack that have been configured to use Superchargers.
Cost Per Charge: Free. No sign up and no cost for electricity.
Website: http://www.teslamotors.com/supercharger 
Technical Support: Available toll-free at 877-79-TESLA