The sale, unanimously agreed by Pennon's board, will result in net cash proceeds of 3.7 billion pounds, the company said.

"On completion of the transaction, Pennon will continue to focus on its sector-leading water and wastewater businesses," Chief Executive Officer Chris Loughlin said regarding the sale of the unit, Viridor.

The owner of Britain's South West Water said it expects to complete the divestiture this summer, subject to European Commission's clearance, among others.

Pennon, which had a total debt of 3.3 billion pounds at the end of September, had been undertaking a strategic review of its business.

The Telegraph reported in January that KKR had attempted to buy Viridor in 2019, but was turned down by Pennon.

(Reporting by Yadarisa Shabong in Bengaluru; Editing by Shounak Dasgupta and Shinjini Ganguli)