Electricity North West's revenue fell during its latest financial year because of the Covid-19 national and local lockdowns while its profits slumped by almost £80m.
The Warrington-headquartered company has reported a revenue of £441.4m for the 12 months to March 31, 2021, down from £469.5m.
Its pre-tax profits also fell from £90m to £11.9m over the same period.
In newly-filed accounts with Companies House, the firm said the decrease in revenue was due to the reduction in electricity consumption during the national and local Covid-19 lockdowns during the year.