TASS would not be the most reliable source for this story, it maybe a Russian red herring. If true this will be on AP soon. It would also be a breaking story on the German press wires or Der Spiegel.
Either way, it was still very wise for Angela Merkel to shut down their nuclear energy producing capability and coal fired plant capability as well. Smart move.
She was on the money when she said Putin was out of touch with reality.