Revenues were 21.3% higher at $2.1 billion, compared with $1.73 billion a year ago. The AGL board said an interim dividend of 26c per share (franked to 16c) will be paid, compared to last year's 25c.

AGL managing director Greg Martin said even without additional revenue from Pulse Energy, which AGL bought last year for $800 million, all core energy businesses have performed well over the last six months.

"Although milder weather affected the energy networks business, the overall performance of all businesses is in line with expectations," Martin said.

As for the company's short-term outlook, Martin said AGL expects full year earnings to exceed last year's result, however, the next six months is not expected to be as strong as the first half due to seasonal reasons.

Currently, AGL is trading at $11, up 9c from yesterday.