Mr Holland said TECT trustees retained their confidence in Trustpower.
"Trustpower continues to have excellent prospects and for this reason we remain committed to the company long term and have ensured our influence is retained," he said.
Trustpower chief financial officer Robert Farron welcomed the move, telling the Bay of Plenty Times there were advantages for both entities in diversifying. Trustpower's major shareholders have been TECT and Infratil, which has a 51 per cent holding.
As a consequence, the stock is considered to have low liquidity, especially given the increased number of utilities in the NZX as a result of the government's partial privatisation. Mr Farron noted that the sell-down gave institutional and retail investors new investment options.
"TECT remains a long-committed and happy shareholder of Trustpower," said Mr Farron.
"They're taking some prudent steps to diversify, but Trustpower is still going to make up around 80 per cent of their total portfolio after the sell-down."
"Demand for the Trustpower shares was strong," said TECT general manager Wayne Werder.
Craigs Investment Partners handled the book building and the shares went to a broad range of investors, mostly in New Zealand, he said.
TECT
TECT (Tauranga Energy Consumer Trust) was established in December 1993 under the Tauranga Electric Power Board Establishment Plan and is now one of New Zealand's largest energy trusts. TECT's income and capital is used to provide benefits to its consumers, who are largely made up of the Trustpower account holders in Tauranga City and the Western Bay of Plenty.