"Both time and cost won't allow nuclear to be done on time ... the question right now is about getting on and getting this done as soon as we can," AGL chief executive Damien Nicks told AAP.
"Our strategy is about building a whole range of assets, not one or the other. It's going to be renewables, batteries, pumped hydro, gas peakers to support what this market needs," he said.
Opposition Leader Peter Dutton plans to build seven nuclear reactors on former coal sites across the nation, including sites owned by AGL in NSW and Victoria, if elected in 2025.
"We're making 20-year decisions that will outlive changes in politics every three or four years," Mr Nicks said.
On the Liddell site in the NSW Upper Hunter region, AGL was one-third of the way through construction of a major battery - a $750 million, 500-megawatt project that was on track for commencing operations in 2026, he said.
AGL was also seeing demand growth for the first time in six years as underlying demand from electrification starts to kick in, Mr Nicks said.
"We're flexing our assets a lot more in the marketplace as the market transitions but also we expect to take FID (final investment decision) on 1.4 gigawatts of new batteries over the next 12 to 18 months," he said.
Big batteries allow energy companies to store excess solar energy generated in the middle of the day and shift it to other times of the day to meet peak demand.
More broadly, the development pipeline has grown to 7GW after recent acquisitions.
The home will also play a huge role role in shifting the load to different times of the day - whether it's home batteries added to roof-top solar, electric vehicles, hot water systems - so customers can share the benefit, Mr Nicks said.
The generator and energy retailer, or gentailer, on Wednesday reported a half-year statutory net profit of $97 million, down $479 million.
Underlying profit was $373 million, down 6.5 per cent on a year earlier, on higher operating costs to maintain generation and as consumers swapped products to try to reduce sky-high power bills.
Moody's Ratings said the upcoming closure of AGL's large coal-fired generators by 2035, which contributed to its "solid" half-year result, underscored the need for continued large investment program to maintain long-term earnings momentum.
Coal fuel costs rose 7.4 per cent driven by an increase in generation at Bayswater Power Station in NSW, and gas costs for electricity generation rose 42.6 per cent as the market operator directed the Torrens Island plant to support South Australia.
Underlying earnings before interest, tax, depreciation and amortisation (EBITDA) eased one per cent to $1.068 billion in the half.
The range for underlying full-year EBITDA narrowed to $1.935 billion to $2.35 billion, while underlying net profit was expected to be $580 million to $710 million.
But UBS energy analyst Tom Allen said AGL's indication of a significant earnings contribution from new batteries at Torrens in South Australia and Liddell added upside to expectations for the 2026-27 financial year.
AGL declared a lower interim dividend of 23 cents per share, down from 26 cents per share a year earlier.
