Although this represents one company's vision of how a charging station network will operate, I certainly don't think it means you should expect to pay $3.50 per hour of charge on most stations. In fact, I'd hazard to guess that the companies that choose this ludicrous method will quickly find they have no customers.
http://www.plugincars.com/how-much-will-it-cost-charge-your-electric-car-public-106551.html
On average a typical battery EV will cost less than $300 per year, or about $0.78 per day to charge at night. A typical plug-in hybrid EV will cost about $700 per year, or $1.92 per day for fuel (including gasoline and electricity costs). Comparable gasoline cars can cost between $1,000 and $2,500 per year to fuel - up to eight times more money spent each day.
http://www.mto.gov.on.ca/english/vehicles/electric/charging-electric-vehicle.shtml
EDrive Systems use Valence Technology Li-ion batteries and have a claimed 40 to 50 miles (64 to 80 km) of electric range. Other companies offering plug-in conversions or kits for the Toyota Prius (some of them also for Ford Escape Hybrid) include Hymotion, Hybrids Plus Manzanita Micro and OEMtek BREEZ (PHEV-30).
https://en.wikipedia.org/wiki/Plug-in_hybrid
As reported by the test drivers, the V70 Plug-in Hybrid demonstrators have an all-electric range between 20 kilometres (12 mi) to 30 kilometres (19 mi). The test plug-in hybrids were built with a button to allow test drivers to manually choose between electricity or diesel engine power at any time.
https://en.wikipedia.org/wiki/Plug-in_hybrid
A plug-in hybrid's all-electric range is designated by PHEV-[miles] or PHEV[kilometers]km in which the number represents the distance the vehicle can travel on battery power alone. For example, a PHEV-20 can travel twenty miles (32 km) without using its combustion engine, so it may also be designated as a PHEV32km.
https://en.wikipedia.org/wiki/Plug-in_hybrid
Lithium-ion battery pack, with cover removed, in a CalCars PRIUS+ plug-in hybrid converted Toyota Prius converted by EnergyCS. Several plug-in hybrid converted Toyota Prius at Professorville, Palo Alto. The right side car is a Prius + converted by CalCars with a fuel economy of over 100 miles per gallon.
https://en.wikipedia.org/wiki/Plug-in_hybrid
On average a typical battery EV will cost less than $300 per year, or about $0.78 per day to charge at night. *1. A typical plug-in hybrid EV will cost about $700 per year, or $1.92 per day for fuel (including gasoline and electricity costs). *2. Comparable gasoline cars can cost between $1,000 and $2,500 per year to fuel - up to eight times more money spent each day.
http://www.mto.gov.on.ca/english/vehicles/electric/charging-electric-vehicle.shtml
For the near future, the place where you're most likely to charge your plug-in hybrid is in your own garage or carport. How you'll actually do this will depend on the specific plug-in hybrid you own. We'll use the Chevy Volt as an example. The Volt comes with two chargers that you can use on home electric current. The smaller, 120-volt charger is designed to be portable and will plug into a standard electric outlet.
http://auto.howstuffworks.com/car-models/plug-in-hybrids/how-to-charge-plug-in-hybrid-vehicle1.htm
The second generation Prius plug-in hybrid, called Prius Prime in the U.S. and Prius PHV in Japan, was unveiled at the 2016 New York International Auto Show. The model is expected to be released in the U.S. and Japan by the end of 2016.
https://en.wikipedia.org/wiki/Plug-in_hybrid
New EVs can typically travel at least 100 kilometres on a single charge. Some battery EVs can go up to 160 kilometres on one charge, while plug-in hybrid electrics may travel more than 500 kilometres using a combination of battery and gasoline engine technology. The distance an EV can travel depends on:
http://www.mto.gov.on.ca/english/vehicles/electric/charging-electric-vehicle.shtml
how much cost for charging plug in hybrid
It costs $700 per year to charge a plug in hybrid. The cost for charging plug in hybrid is $700 per year. The cost of charging plug in hybrid is $700 per year.  