A spokesperson for the state-owned energy utility confirmed the move in an e-mail to ZDNet Australia this afternoon, saying the appointment was made official in late June.
Kennedy is the former CIO of the NSW Department of Housing.
The appointment finally puts paid to a lengthy executive search process for Energy Australia after the previous CIO Jerry Sadlowski left sometime after September last year.
It is understood Kennedy and a number of other interim CIOs have acted in the role since that time.
Energy Australia advertised the position several months ago, stipulating the successful candidate would be employed under a five-year contract.
Kennedy will oversee a large IT resource, with the utility employing some 250 technology staff.
One of her key priorities will be to create an organisation-wide strategic IT plan, which will determine the business cases for new technology solutions at the company.
Kennedy will report to the general manager, finance and corporate, and to the IT steering committee. The committee was set up last year to improve governance.
Energy Australia is one of the nation's largest energy utilities with around 1.5 million residential and business customers. The company operates an electricity network in Sydney in addition to the Central Coast and Hunter regions.
ZDNet Australia's Steven Deare contributed to this article.