Germany's cabinet approved Tuesday a broad slate of new energy proposals, including extending the lifespan of the country's nuclear plants and billions in levies the operating utilities will be obliged to pay in return.

The government's energy strategy also includes targets for drawing more power from renewable energy, renovating power grids, and improving efficiency by 2050.

"I admit, our targets are ambitious," Chancellor Angela Merkel said.

Four decades from now, the government wants greenhouse gas emissions to be 80% lower and for some 60% of the country's power to come from renewable sources--up from about 16% today. To make that goal more realistic, the lifespan of the country's 17 nuclear reactors will be extended, allowing them to serve as a "bridge technology," as Merkel and her ministers have often said.

"Nuclear energy has a bridging role, not a future role," Environment Minister Norbert Roettgen told reporters in Berlin after the policies were approved.

Overturning a previous government's agreement to shutter the last plant by 2022 was the most controversial aspect of Merkel's new energy policies, dividing ministers in her cabinet and drawing large anti-nuclear protests outside her Berlin offices and around the country.

The Social Democrats, who championed the shutdown under a previous government and now lead the opposition, condemned the government's proposals Tuesday and said they would fight to bring them before the upper house of parliament, where Merkel's government lost its majority earlier this year. Merkel has said the energy policies will only need approval in the lower house, where she maintains a majority, to become law.

Under the proposal ministers signed off Tuesday, plants built before 1980 can operate eight years longer than planned, and newer plants up to 14 years longer, which would put Germany's last nuclear reactor offline sometime in the 2030s.

To compensate for the longer lifespans, the four utilities that operate nuclear reactors--E.ON AG (EOAN.XE), RWE AG (RWE.XE), EnBW Energie Baden-Wuerttemberg AG (EBK.XE) and Vattenfall Europe AG--will be obliged to invest in heightened security systems at their plants.

In return for the unanticipated profits the utilities stand to reap from the extended lifespans, they will be required to return more than half the revenues to the government.

The first payments will come as a levy on nuclear fuel rods that the government projects will generate EUR2.3 billion annually through 2016, funds it has pledged toward deficit reduction. On top of that, utilities will contribute to a fund for renewable energy technology research: EUR1.4 billion through 2016--while the nuclear fuel tax is in effect--and an additional EUR16 billion thereafter.

The BDI Federation of German Industries greeted the government's plans, but cautioned that the cost of the nuclear levies and other new investments to utilities and other countries may be higher than anticipated.

"Some assumptions in the energy plan go beyond what companies can currently afford as justifiable expenses," BDI President Hans-Peter Keitel said.

One such example is the upgrade of the grid system, which Germany needs to carry out to supply customers in a reliable way with renewable energy, he said, adding that "huge investments are needed for such networks."