Police are conducting enquiries on behalf of the coroner.
Genesis chief operations officer Rebecca Larking said the water release from Lake Whakamarino into the Waikaretāheke River over the weekend was among the company's notified annual programme of recreational releases.
It was performed in accordance with its resource consents and in agreement with the Hawke's Bay Canoe Club.
"The details of these releases are published on our website for use by those who wish to use the respective rivers for recreational purposes," said Larking.
On Sunday, water was due to be released from Lake Whakamarino Dam between 9am and 3pm at the rate of 17 cubic metres per second, travelling down the Waikaretāheke riverbed towards the Piripaua station.
"As soon as Genesis was alerted to an on-river emergency, Genesis responded, as requested, by reducing the flow down the riverbed as quickly as possible," Larking said.
"We were saddened to learn of the death of a local kayaker," she said.
"Our thoughts go out to their family, friends and the kayaking community."