For example, some may offer tax rebates for producers of these vehicles, but non-local enterprises may be ineligible because they pay no taxes in the area except for sales tax paid by dealers and buyers.
Consequently, regional policies in each area allow support to flow only to locally built models and practically exclude models by non-local manufacturers.
As a leader in China's alternative-energy vehicle market, Shenzhen-based BYD can be taken as an example.
Since trial operations for the model began in 2010, more than 800 BYD E6 electric cars have been added to the local taxi fleets in Shenzhen, according to the latest available statistics.
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However, the model has not been promoted successfully outside Shenzhen because of local restrictions in subsidy policies.
Guangzhou is in the same province as Shenzhen, but in the city, the Nissan Leaf has been selected as the main demonstration model of electric vehicles.
Because the city's subsidies were recently expanded to include hybrids, local automaker Guangqi Toyota was naturally one of the main beneficiaries.
When the local subsidy program was launched last year in Shanghai, the qualified models were the Roewe E50, the Sail Springo, and the Lifan, all of which are locally produced.
The BYD E6 was reportedly unable to enjoy the subsidy policy because it was temporarily not in line with standards in Shanghai.
In Beijing and Hangzhou, the stories are similar.
Only locally manufactured models like the Foton in Beijing and Zotye in Zhejiang can benefit from the subsidy policy.
Therefore, local protection is a major obstacle restricting the popularization of green vehicles. It is also one of the main reasons for the slow development of the alternative-energy vehicle market in various cities.
If the central government's subsidies continue to be used alongside local subsidies with a protectionist tendency, a major side effect will be fragmentation of the market, while the commercial prospects of alternative-energy vehicles will remain uncertain.
The author is a director of LMC Automotive Asia Pacific Forecasting. He can be contacted at jzeng@lmc-auto.com.