The new boss of South West Water owner Pennon has insisted vital investment plans will be funded in the โ€œright wayโ€ as he unveiled a ยฃ550 million investor cash-call just weeks after being hit with a record ยฃ7.9 million fine for repeated sewage spills.

Keith Haslett, who was appointed chief executive of Pennon in April, said the rights issue would help support plans for around an extra ยฃ1 billion of investment as it looks to โ€œdeliver better outcomes for our customers and communitiesโ€.

The London-listed group, which also owns Bristol Water and SES Water, will also slash its shareholder dividend as part of the โ€œoperational resetโ€, cutting the payout by around 30% in total, also including the impact of the equity raise.

Mr Haslett told the Press Association that shareholder reaction to the plans had been โ€œmixedโ€, with shares plunging by nearly a fifth in morning trading on Wednesday.

But he said: โ€œInvestment is needed to achieve improvements โ€“ weโ€™re funding the plans in the right wayโ€.

Customer bills are already increasing as part of existing plans to pump in about ยฃ2.6 billion of investment under plans being agreed with regulator Ofwat.

But Mr Haslett said the extra ยฃ1 billion of investment announced under his strategy overhaul will not see additional bill increases.

It follows last monthโ€™s record-breaking fine for South West Water handed down at Plymouth Magistratesโ€™ Court for 18 charges of environmental offences relating to pollution incidents in Devon and Cornwall over a six-year period.

The group confirmed this fine would be paid for by its shareholders, separate to the rights issue, and not through bill increases.

Mr Haslett, who took on the role in April, said: โ€œItโ€™s clear from my comprehensive review that Pennon has real strengths, but there are areas where we need to improve and deliver better outcomes for our customers and communities.โ€

He added: โ€œThe operational plan, which is already under way, is practical and focuses on clearer accountability with key skills brought back in-house, and more investment where our assets need it most.โ€

Mr Haslett insisted the plan would โ€œdeliver a better service for customers, improve our environmental performance and generate sustainable, growing value for our shareholdersโ€.

The group is also looking to sell its Pennon Power business, with around ยฃ25 million from the sale set to be used to reduce group debts and renewable generation at its operational sites.

Mr Haslett said he has spent six months reviewing the group since taking on the top jobs and said a better โ€œoperational gripโ€ was needed on the business, while he is also bringing some critical roles in-house, such as leakage teams, which were previously outsourced.

He said customers would see improvements being made under the investment plans, reassuring them that leakage would start to reduce in the South West, where there have been high-profile issues with pollution, while improving supply failures and customer service.

The chief executive admitted the group had โ€œwork to doโ€ to improve customer service in the South West Water and SES Water, but hopes this will be helped by a new customer and billing platform.