FRANKFURT, Aug 10 (Reuters) - German utility E.ON said on Wednesday it had sold 90% of the remaining 2022 output from its Isar 2 nuclear plant ahead of the reactor's planned closure at the end of the year.

Presentation slides for first-half financial results showed power production from Isar 2 in E.ON's non-core PreussenElektra unit was sold at 78 euros ($79.68) per megawatt hour (MWh), as of June 30.

Hedging rates of forward generation volumes are tracked by traders and analysts to assess what supply is tied up with counterparties and the value of production.

Isar 2 is a 1,400 megawatt (MW) plant in Bavaria able to power the equivalent of a metropolis.

By comparison, the over-the-counter price of German round-the-clock power from all conventional energy sources to be delivered in 2023 closed at 408 euros/MWh on Tuesday, according to Refinitiv Eikon data.

The price of the wholesale market's benchmark position has more than trebled this year on a combination of energy scarcity and Russian gas supply worries in particular, that have spilled into related fuels.

Public support is rising to review Germany's move to phase out remaining nuclear reactors in light of the crisis, which also entails RWE's Emsland and EnBW's Neckarwestheim 2 closing at year-end, and power grid companies have requested a fresh assessment.

($1 = 0.9789 euros) (Reporting by Vera Eckert; Editing by Subhranshu Sahu)