German Chancellor Angela Merkel said Saturday that 2022 was "a good time" for Germany to end nuclear power, backing a proposal by the Bavarian wing of her party.
She described as "an important contribution" the scenario set out by the Christian Social Union at a meeting in the southern town of Andechs.
The centre-right government is to set out its strategy by the beginning of June and agree draft legislation at a cabinet meeting on June 7 or 15.
Following the earthquake and tsunami which wrecked the Japanese nuclear plant of Fukushima in March, Merkel ordered the closure for three months of Germany's seven oldest reactors.
She also announced a moratorium for the same period of an earlier decision by her government to extend the lifetime of Germany's 17 reactors by an average of 12 years.
Explore further: Germany shuts down seven reactors