"Some trusts have chosen to distribute their dividend receipts as a rebate in the form of a credit to consumers' electricity accounts," he said.
"As we have considered various options, we have recognised that this option was not sustainable.
"As the information sent with our cheques details, there are tax credits applied to our gross dividends and withholding tax paid, so that the dividends received by our consumers are tax free."
Apart from the dividend cheques, the trust allocates $1.5 million to supplement Unison's programme to put overhead electricity lines underground.
It also gives $400,000 to a programme to insulate local homes towards improved health and energy efficiency.
Unison owns the electricity distribution networks for Napier, Hastings, Rotorua and Taupo but about 10 per cent of its profit comes from its subsidiary companies: Unison Fibre, Unison Contracting Services, Unison Insurance and transformer manufacturing business ETEL.
ETEL was purchased in 2009 and this year the Auckland-based company bought an Indonesian transformer manufacturing business, opening up potentially lucrative supply contracts to the world's fourth-most-populated nation.
As an ASEAN nation, it opens up further trade opportunities through transfers of New Zealand transformer technology.