As fuel prices keep falling across the US, sales of fuel efficient vehicles keep going with them. By AutoblogGreen's tally, the market for green cars, which includes diesels, is down 6.4 percent through November 2014. However, there is a bright spot in the bleak news. Plug-in sales are actually up for the year by about 30 percent. A report from the US Energy Information Administration, a branch of the Department of Energy, finds that this segment is still growing. Though, their popularity is still largely a West Coast phenomenon.

When looking at registrations as of 2013, the study found about 70,000 battery electric vehicles and 104,000 plug-in hybrids nationwide. While still a tiny percentage of the 226 million total, the segment shows expansion. The total for all plug-in vehicles (PEVs) among new sales was 0.4 percent in 2012, 0.6 percent in 2013 and 0.7 percent through 2014 so far.

About half of the nation's plug-ins reside in California, and the state boasts the highest rate of them in the US with about five out of every 1,000 vehicles there using an outlet to charge. Although, there are very good reasons for this, like the state's laws that mandating automakers sell zero-emissions models with the Zero Emission Vehicle (ZEV) Program. While some other states have decided to follow California's lead, most plug-in vehicles are not sold outside of the Golden State. California wants at least 15 percent of the cars there to be emissions-free by 2025.

Other states are showing improvement too. According to the study, Washington and Hawaii are the only two other places with three or more PEVs per 1,000 vehicles. Oregon, Georgia and Maryland come close though, with between two and three per thousand.

The figures also suggest the interesting effects that incentives can have on PEV sales. In addition to federal money, Californians can claim up to $2,500 for electric vehicles and $1,500 for plug-in hybrids. However, Washington puts more motivation behind pure EVs by making them exempt from the state's 6.5 percent sales and use tax. The intriguing result is pure electric vehicles actually outnumber plug-in hybrids in the state – a rather unique situation. Scroll below to read the EIA's full report.
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California leads the nation in the adoption of electric vehicles

In 2013, there were about 70,000 battery electric vehicles (EVs) and 104,000 plug-in hybrid electric vehicles (PHEVs)-small numbers compared to around 226 million registered vehicles in the United States. Total U.S. sales of plug-in electric vehicles (PEVs) have increased in recent years, but still represent only about 0.7% of new vehicle sales in 2014 so far, up from 0.6% in 2013 and 0.4% in 2012. California is home to almost half of all of the nation's PEVs, but even in California, only about 5 out of every 1,000 registered vehicles are PEVs.

Several states offer tax incentives to reduce the upfront cost of PEVs to consumers. These incentives are in addition to a federal (nationwide) tax credit, which ranges from $2,500 to $7,500 depending on battery capacity and gross vehicle weight. Examples of incentives include the following:

California offers rebates of up to $2,500 for EVs that run only on a charge, and $1,500 for PHEVs, which can also run on gasoline.

Washington has exempted EVs from the state's 6.5% sales and use tax. However, the incentive does not apply to the purchase of PHEVs. While PHEV ownership is higher than that of EVs for the United States, the reverse is true in Washington.

Georgia offers a zero emissions vehicle (ZEV) tax credit of 20% of the cost, up to $5,000. ZEVs include vehicles powered by electricity or hydrogen fuel cells.

Maryland offers a tax credit of $125 for each kilowatthour of battery capacity of an EV, up to $3,000.
Many EVs have a battery capacity sufficient to obtain the full credit. PHEVs have a lower capacity and therefore secure a lower credit; the state estimates that a consumer purchasing a plug-in Toyota Prius would get a credit of $550.

The District of Columbia has a tax credit of 50% of the incremental cost of an EV, up to $19,000. The District also exempts EVs from its excise tax, which varies from 6% to 8% depending on vehicle weight.

Some utility companies offer special electricity rate structures for PEV owners to incentivize vehicle charging during off-peak hours, generally in the evening. For instance, DTE Energy in Michigan offers customers discounted electricity rates at off-peak hours if they install a 240-volt Level 2 charger, which powers a PEV more quickly than a 120-volt Level 1 charger. The ratepayer must also install a separate meter dedicated to the PEV. Customers also have the option of paying a flat $40 monthly fee for charging.

California implemented a ZEV mandate that requires automobile companies to produce for sale a certain percentage of zero emission vehicles, such as electric and hydrogen fuel cell. By 2025, approximately 15% of all new light-duty vehicles sold in the state must be either electric or fuel-cell powered.
Nine states have agreed to follow California's ZEV mandate: Connecticut, Maine, Maryland, Massachusetts, New Jersey, New York, Oregon, Rhode Island, and Vermont. These ten states represent close to one-quarter of the U.S. light-duty vehicle market.

Principal contributors: Nicholas Chase, Allen McFarland

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