Germany’s opposition Social Democratic party, in an effort to block the Merkel coalition government's nuclear reactor license renewal policy, is pushing for a national referendum on the future of the country's nuclear power program. A referendum cannot occur until the country’s constitution is amended, as referenda are currently illegal. The move follows a massive demonstration on September 18 in Berlin that saw 100,000 people take to the streets protesting the license renewal of the country's 17 nuclear plants which have been granted 12-year license extensions. In contrast, the U.S. Nuclear Regulatory Commission in the U.S., routinely hands out 20-year license extensions for this country's dangerous and aging reactors.