Construction of the geothermal power plant Te Ahi O Maui, near Kawerau, can now begin after the completion of the drilling stage.
Project manager Ben Gibson said the drill rig and associated equipment had now completely demobilised from site, where they had been working since May.
The drilling process targeted known sources of geothermal fluid, which could be as hot as 200-300C, he said.
"The drilling was successful - we located the high-temperature fluid that will ultimately fuel the geothermal power plant, and the injection capacity necessary to manage the cooler fluids that have passed through geothermal power plant."
Well pads were constructed on site and the Old Coach Rd, near Kawerau, was upgraded in preparation for the drilling rigs arrival in late April.