Members of the world's first Greens party are planning to reregister and contest the next state election, taking a swipe at the Tasmanian Greens.

Key points: United Tasmania Group trying to reform

United Tasmania Group trying to reform Party first formed in 1972

Party first formed in 1972 Claims people "disillusioned" with Greens

Geoff Holloway is part of a push to reform the United Tasmania Group (UTG) and is confident of signing the required 200 members required by the Tasmanian Electoral Commission.

The party was formed in 1972 in response to the flooding of Lake Pedder, before morphing into the Greens by the late 1970s.

Mr Holloway said disillusion with the Tasmanian Greens had been growing over two years, leading to the first meeting of the new-look United Tasmania Group at the weekend.

"We don't feel that the present state Greens appreciate the wilderness and national parks aspects of Tasmania that many of us fought [for], even decades, to preserve," Mr Holloway said.

He cited the Tasmanian Greens "tacit support" for a proposed tourist walking track at Lake Geeves in the state's south as an example.

"If they're going to expand and aspire to government then obviously they've got to broaden their base but at the same time they should never forget their roots," he said.

Mr Holloway has not formally signed up any members yet and is not saying how many people attended the first meeting on Saturday.

Tasmanian Greens Leader Cassy O'Connor defended her party's record, pointing to the extra 170,000 hectares added to the World Heritage Area and 9,500 energy efficiency upgrades delivered while the Greens were part of minority government.

"We are the only party in the Tasmanian Parliament that consistently stands up for Tasmania's parks and World Heritage Area," she said.

"We are the only party that asks the important questions around the bushfires in the World Heritage Area, we are the only party that's delivered a renewable energy security plan."