The record-breaking 420,000 sum is the biggest ever shirt sponsorship deal in Welsh rugby below the national team.
Npower renewables have been unveiled as the official sponsor, plowing a record-breaking 300,000 into the region over the next two years.
And today Ospreys skipper Barry Williams unveiled the new look Ospreys shirt emblazoned with the npower renewables brand logo, alongside fellow Ospreys and Wales stars Gavin Henson and Ryan Jones.
Mike Cuddy, joint managing director of the Ospreys was glad to seal the lucrative deal with such an innovative company.
"We are very pleased to secure such a lucrative sponsorship deal for the Ospreys and
to work with npower renewables, who are an innovative company, leading the way in green energy in the UK."
And Kevin McCullough, Managing Director of npower renewables said the feeling was mutual and they were excited to be sponsoring "the leading team in Wales".
"We are delighted that the first major npower renewables sports sponsorship deal will be with the Ospreys," said McCullough.
"They are the premier team in Wales and have a growing fan base throughout the South West Wales area. We were attracted to the sponsorship because of the team's outstanding performance over the last season and reputation as the leading team in Wales."
A special video package as Pontypridd claimed the double for the first time in their history by winning the Principality Premiership final, including match build-up, highlights, post match reaction and dressing room celebrations.