"There are more mature and older New Zealanders living longer and shopping more than ever before."
Mature and older people outspent younger consumers and had more time to shop, she said. "We are encouraging other companies to become SUPA-NZ accredited to ensure they don't miss out on what, based on recent research, is $43billion of business."
The Trustpower assessment was undertaken by an audit team of elders and was an iterative process with the company agreeing to the indicators that would be used to measure the company's progress.
"We've had lots of positive feedback from our customers of all ages regarding the new simplified bill format," said Graeme Purches, Trustpower's community relations manager.
"Things like it was easier to read, the print was a better colour and bigger, the bill was easier to understand and that customers appreciated the thought and efforts that had gone into to making these changes for our mature customers."
The company also learned that not everyone saw information the same way. For demonstration purposes, it sent customers a sample of the new-look bill addressed to "A Customer", with a total of $37 to pay on it.
However, several customers then paid the sample bill, he said. The customers got the amount credited back on their next bill.
Steve Merchant, Trustpower's service delivery manager, said the process opened up great communication channels between Trustpower and the audit team.
"It has really made us think about how we take what we learnt into our future business planning process. We would thoroughly recommend companies go through the SUPA-NZ accreditation process."
Proven formula
The SUPA-NZ business accreditation programme is based on similar programmes in cities around the globe, including New York and Manchester.