Many governments promote green technological innovation within the automobile sector as a means of combating climate change. Most of these innovations are driven by alternative fuels. Buyer's premiums and governmental investment in service infrastructure are widely used. This paper investigates the question regarding whether market intervention is adequate by considering the two-sided market character of the automobile market. This study shows that network effects, competition effects triggered by more automobile users and decreasing marginal utilities of further service stations determine the welfare-efficient extent of governmental intervention. The results of the analysis indicate that governmental promotion of service infrastructure is reasonable, although governments should be cautious about buyer's premiums.