Mr Te Tau was pulling the boat toward a grass area when the incident occurred.
"I had manoeuvred the boat onto the edge of the grass to lower the mast and get under the power lines. I hadn't yet started lowering the mast when it came close - about 50 centimetres - to the lines and an electricity arc came from the lines to the top of the mast.
"It passed through the mast, the boat and then the electric shock got me."
He remembered the incident clearly, including looking up and realising that he was being shocked by the overhead lines.
Mr Te Tau is the partner of an Outward Bound instructor and lives on site at the Outward Bound school in Anakiwa.
He was not involved in an Outward Bound course at the time, and none of the school's students were involved in the incident.
Outward Bound chief executive Trevor Taylor said Mr Te Tau was in good spirits.
"He's back to his cheeky self," he said.
"He's talking, he's laughing. He realises he's been there and back."
Outward Bound would conduct a review, he said.
Mr Taylor said WorkSafe had already looked into the event and would not investigate further.
"We have also been talking to the lines company ... because it is a hazard for the general public," he said.