Chief executive Albert Brantley said the increase came despite Genesis facing pressure on customer numbers and subdued demand.
''The electricity market remains challenging, given the abundance of water and new generation entering the market putting downward pressure on wholesale electricity prices.''
The company's targeted sales programme and a successful advertising campaign during the three months ended September had attracted new electricity and gas customers, Mr Brantley said.
The company also was successful with bids for some commercial and central energy contracts, helping boost sales.
However, strong hydro storage and reduced demand were putting pressures on wholesale pricing and the company's thermal generation plant.
As a commercial response to market conditions, Genesis announced last month (September) it would place a second of its four older coal-fired generating units at Huntly into storage before the end of the year.
Mr Brantley said competition for retail customers continued to be high in the quarter. On September 30, the company had 540,422 electricity customer accounts, or 27% of market share, 116,097 gas accounts, 44% of market share, and 10,033 lpg customers. Genesis Energy's electricity customers included 84,000 accounts in the South Island, representing 16% of the total.
Genesis operates the Tekapo A and B stations in the Mackenzie Country.
Prime Minister John Key last week said Genesis was still on the Government's agenda for a partial sell-down next year following the sales this year of 49% stakes in Mighty River Power and Meridian.
Analysts suggested to the Otago Daily Times Genesis could be split up and sold to listed energy companies, removing the need for a prospectus and listing costs.
