@Echo - PV systems are competitive with grid energy when you take into account they produce mostly peak energy. My system produces more energy during the day than I use. I "sell" those kWh to my utility for 30 cents/kWh and "buy" them back at night for 10 cents. I always charge my car on low cost off-peak energy which is why my electricity bill is only about $100 per year. I paid $15,000 out of pocket for my system back in 2002. By my calculation, it's paid for itself as of this year. Having an EV increases the ROI on solar since you're offsetting both your utility's energy cost and the cost of gasoline.
@Echo - Electric cars charged from the national grid, which is about 45% coal, are 2-3 times cleaner than a Prius, the most efficient gas car sold in the U.S. If using dirty energy to charge your car is not acceptable to you, it's easy to install a solar PV system if you have a good roof for solar. I've been running both my house and car on solar for 9 years now. My electric bill has average a mere $100 per year since 2002. I've driven 97,000 miles on sunlight, and my car has required virtually zero maintenance in all that time. I recently sold my old EV (Toyota RAV4 EV) for $18,000 and it was still running like new.
The addition of EVs to the demand side of electricity won't have a negative effect at all. Most charging will be done at night during off-peak hours. The Energy Dept. studied the grid and found that there is enough excess capacity on the grid at night to charge 180 million EVs without adding any new capacity.
In the past 4 years, we've installed 26 GW of wind energy and 2 GW of solar. That's enough new renewable energy to charge over 25 million EVs! We'll be installing vastly more renewable energy to the grid than all the EVs ever produced will need.
The purpose of the letter grade is to inform the buyer of the efficiency o the vehicle. If certain vehicles emit more pollution and use more energy, then they should get a grade indicating that. If a person needs a vehicle that uses more energy, then they will buy it regardless of the grade. From my observations, most people who buy those grossly inefficient SUVs and pick up trucks rarely, if ever, use the full capacity of the vehicle, They could easily get by with a much more efficient vehicle.
Our country is far behind our competitors when it comes to efficiency and this fact is hurting our economy, not to mention our national security. It's time we got serious about getting efficient before it's too late.