"Key" City of Greater Bendigo staff have seen an early draft of an energy plan flagging the risk, according to a separate environmental activities report by the council.

The energy plan has not been released publicly but consultancy Enhar Energy has already identified "key learnings" the council should take on board during its push to emit no greenhouse gases by 2036.

One is that some large council-owned buildings are exposed to falling Victorian gas production.

Council officers are currently considering the Enhar report's potential implications.

"Facilities such as our heated swimming pools and the environmental control requirements for the Bendigo Art Gallery may need investigation of alternate energy sources other than gas," the council's environmental activities report observed.

Gippsland producers last year told the Australian Energy Market Operator they expected a 22 per cent production drop by 2023. Counterparts in Port Campbell said theirs would fall 74 per cent.

There will be enough gas to meet demand in Victoria, South Australia and New South Wales but peak demand in winter will keep tightening, an AEMO report published last March found.

"Additional sources of gas supply are currently being investigated to address supply adequacy, including increased gas exploration and production that may increase committed Victorian production," it found.

"Other additional sources of supply include gas transported via pipelines from Queensland, or the importation of liquefied natural gas."

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The council believes it can drive the city's carbon footprint down to zero by 2036 despite a huge jump last financial year as Kangaroo Flat's indoor pool opened, acting strategy and growth director Trevor Budge said.

It has teamed up with 42 other local governments to purchase renewable energy in bulk, which Mr Budge said would eliminate all emissions from electricity consumption in buildings and streetlights by 2021.

"We are working on ways to reduce gas consumption by electrifying buildings and reducing transport emissions through electric vehicles," he said.