TECT's contribution will be $900,000 of the $5.1 million facility, which will service an exploding local population in the eastern suburbs of Tauranga.
"TECT's announcement couldn't have come at a better time for us, as we kick into a major community fundraising drive before Christmas," Papamoa Rescue Base Trust chairman Jim Pearson said.
"We're so appreciative of TECT and the amazing work they do for the community and their ongoing support means we're right on track."
It means the Pāpāmoa club is now sitting at around 70 per cent of the total budget needed, with aims of getting to 90 per cent by Christmas.
Mount Maunganui started its build with around 65 per cent already raised, conscious of the need to get it started and mostly complete before this coming summer, and a major fundraising drive over winter has left the club with just $200,000 left to find.
TECT general manager Wayne Werder said the Trust was impressed by the way the two clubs were working together for the greater good, sharing knowledge and fundraising ideas.
"We've got so many stunning beaches in our region but with them comes a responsibility to ensure that people are safe in the water and our surf lifesaving clubs have provided an incredible service to our communities for many years," he said.
"As the population continues to grow, we're confident these much-needed facility upgrades will allow them to keep doing what they're doing for many more years to come."
Both new clubs will provide world-class surf lifesaving facilities, with Papamoa's larger club also able to share space with community groups such as Lions, Papamoa Surf Casting, Girl Guides and Boy Scouts.
Pāpāmoa's original 1990 building was originally built for 100 members; the club now has more than 800.
The 89-year-old Mount Maunganui club's last building dated from 1978, and both structures suffered from the incredibly harsh ocean environment.
Mount Maunganui chairman Paul Manning said the fact that TECT represents 56,000 Trustpower customers in the Western Bay of Plenty makes its total contribution even more poignant.
"TECT has a proud legacy of helping thoroughly worthy community projects and we're so grateful to be able to continue that legacy along our stunning coastline," Manning said.
"Our clubs are entirely volunteer-driven, by people who love the beach and the ocean and who want the Bay of Plenty public and visitors alike to share that enjoyment. This is a hugely significant contribution to both clubs, one which will make a tangible difference."
How to help:
To help complete these much-needed community facilities that keep people safe, you can email info@papamoalifeguards.co.nz or visit www.mountlifeguards.co.nz/donate/