OSLO, June 25 (Reuters) - Equinor's Arctic Hammerfest LNG plant has resumed operation as planned following a weekend power outage that halted production, a spokesperson for the Norwegian energy company said on Tuesday.

The plant's own power generators had been undergoing maintenance when its backup supply from an external grid failed, resulting in the outage.

Hammerfest LNG, also known as Melkoeya, has capacity of about 6.5 billion cubic metres of gas per year. That is enough to supply about 6.5 million European homes and accounts for roughly 5% of all Norwegian gas exports. (Reporting by Nora Buli, editing by Terje Solsvik)