Russia has repeatedly denied trying to hack into other countries' infrastructure. Asked to comment on Maassen's accusations, Kremlin spokesman Dmitry Peskov said: "We don't know what he was talking about."
Germany's BSI federal cyber protection agency disclosed the cyber attack dubbed "Berserk Bear" on June 13, citing efforts by hackers to penetrate the computer networks of many German energy and electricity providers.
Maassen did not identify how many companies were targeted in the attack, which BSI has said is now under control.
Foreign Minister Heiko Maas in April also said Germany had to assume that Russia was behind a cyber attack on the foreign ministry that was discovered in December. (Reporting by Andrea Shalal Additional reporting by Maria Tsvetkova in Moscow Editing by Peter Graff)
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