Ahipara environmental campaigner Rueben Taipari Porter will contest the Northland byelection for the Mana Party.
Mr Porter said he had accepted the party's candidacy because he was concerned about corruption, blatant disregard for the democratic system, fast-tracked laws, the misuse of Government intelligence services, "convenient forgetfulness" and other unethical practices.
"National made a lot of promises in the election last year and has kept none of them. It seems to be a regular occurrence that National takes Northland voters for granted," he said.
Now National was going to cost the country close to $1 million for a byelection which could have been avoided had they investigated their candidates more thoroughly.
Mr Porter said the future Northland economy, and Mana policies benefiting local businesses, would be a major focus in his campaign.
Mana was strongly opposed to "toxic mining" and deep-sea oil drilling, because they posed major risks with no prospect of compensation or anyone being held accountable if a disaster occurred.