UK Study - Current grid can handle plug-ins and reduce CO2. Many adoption questions

Many decades before everyone in the UK is plugging in

A joint study by Arup and Cenex for the UK’s Department for Business Enterprise and Regulatory Reform (BERR) and the Department for Transport (DfT) finds that plug-in hybrid and electric vehicles can reduce automotive CO2 emissions by 40 percent per vehicle utilizing the current grid.

Nonetheless, the UK study doesn't believe that plug-ins are ready to take over market share. At today's pace the study expects 2.5% of all cars to connect to the grid by 2020, 11.7% by 2030. If the UK takes aggressive measures to develop plug-ins, then those numbers rise to 4.9% by 2020 and 32% by 2030. Under an extreme scenario - the production of plug-in only cars by 2025 - then the numbers plugging in would be 10% by 2020 and 60% by 2030.

More on the study from GreenCarCongress.