"Eskom should now be considered an extension of the sovereign, and bonds should trade as such," JPMorgan analyst Zafar Nazim wrote in a note to clients on Tuesday, upgrading Eskom's 2028 government-guaranteed bonds to "overweight" and reiterating an overweight recommendation on the non-guaranteed 2023, 2025 and 2025 bonds.

(Reporting by Rachel Savage and Susan Mathew in Bangalore; editing by Marc Jones)