Oceanlinx was a company established in 1997 (originally as Energetech Australia Pty Ltd) which specialised in the research and development of ocean-based renewable energy technology.

Oceanlinx technology focused on the oscillating water column principle, and developed several prototype generators which were deployed and tested in Port Kembla, New South Wales.

In 2014, Oceanlinx entered receivership and its technology, intellectual property, brand and trademark were sold to Wave Power Renewables Limited in Hong Kong.

Key innovations of the technology were variable-pitch turbine blades, and a concentrator to increase the amount of energy that can be extracted from the waves.

As waves rise within the OWC, it replicates the action of a piston, driving a column of air ahead of it and through the turbine.

[2] The firm was developing deep-water technology to generate electricity from easy-to-predict long-wavelength ocean swell oscillations.

In 1999 the company received an AUD$750,000 Federal Government Grant to develop a wave energy project at Port Kembla in New South Wales.

In 2004, Energetech was awarded a AUD$1.21 million research and development grant by the Australian Government to facilitate its Wave Energy Optimisation program.

In 2005, Energetech launched an Industry Advisory Service division, and attracted further investment of AUD$500,000 from the Centre for Energy and Greenhouse Technologies.[where?]

It was built approximately 200 metres (660 ft) from the harbour breakwater, and connected to the local electricity grid at 11 kV.

It was intended to sit 4 kilometres offshore from Port Macdonnell, where it would provide electricity for local consumption via a deal with Diamond Energy.

[13] The GreenWAVE generator was then towed to shallow water near Carrickalinga, South Australia, where it sank to the seabed and remains stranded.

[15] In October 2020 it was announced that the partial removal efforts scheduled for October–November that year would be delayed due to poor weather, and would instead be carried out January–March 2021.