Water utility firm Severn Trent has increased its guidance for the net reward from outcome delivery incentives for the financial year to £15m. It had previously expected just £10m.
The company gets a pay-out from the industry regulator Ofwat if it over delivers on its performance targets.
The regulator ensures water companies pass on savings to consumers and offers incentives if targets are met or exceeded.
The FTSE 100 water company is still expecting to perform inline with forecasts.
Shares have dipped by half a per cent to 2,186p on the news.
In November group reported turnover broadly flat at £896.1m in the six months to September 30, from a restated £898.3m during the same period a year earlier.
Customer complaints in November, one of the company's most watched metrics, fell by 35 per cent, and there was a significant increase in the number of customers helped through social tariffs.
The firm will announce results for the year ending 31 March 2016 on 24 May 2016.
Liv Garfield, chief executive, said: "Having locked in the savings set out in our Final Determination we are working hard to identify further efficiencies, while continuously improving our services, and will provide a further update with our results in May. There remains much to do, but this year is shaping up to be a great start to the current regulatory period."
In July last year Severn Trent told investors operating costs are expected to be lower compared with the previous year, which the company attributed to organisational changes and supply chain efficiencies.