Mercury is attempting to get hold of the assets of its jailed former engineer and his estranged wife.
Police have also filed an application with the High Court for Paul and Jane Rose's assets to be forfeited.
Paul Rose in May was sentenced to three years and two months' jail for obtaining $2.2 million from Mercury (formerly Mighty River Power) by deception.
His estranged wife Jane was sentenced to nine months' home detention for assisting with some of the offending. She has filed an appeal against her convictions.
The offending took place over Paul Rose's eight years of employment with Mighty River Power, which ended after an investigation and his subsequent dismissal in December 2012, when it was still a state-owned enterprise.