Prominent UK oil and gas producers are express deepening concerns about the impact of windfall taxes on profitability, raising doubts about the viability of future investments and projects.

Harbour Energy, owned by US private equity giant EIG, said on Thursday that it expects its total tax payments in the UK to be $600 million in 2022, more than double its 2021 payment, in part driven by the introduction of the country’s so-called Energy Profits Levy (EPL).

Its estimated 2022 EPL liability exceeds $350 million, of which about $200 million was paid in 2022 with the balance to be paid in 2023.