ACT residents would receive a refundable tax credit up to 50 per cent of the value of their new battery storage system in a policy announced on Thursday by ACT Greens senate candidate Christina Hobbs.

Cuts to fossil fuel tax breaks would fund the programs, the Greens say.

"Now is the time to jump-start the battery industry, encourage the take-up of storage and cement Canberra as a renewable energy leader," Ms Hobbs said.

The rebate would be worth $5000 in the first year of the program and taper off to $1500 by 2021, in line with projected cost decreases for the technology.

Businesses would also be allowed to deduct new solar battery storage systems over an accelerated period of three years.

Up to 1.2 million homes across Australia and up to 30,000 businesses would be supported by the initiative, Ms Hobbs said.

A grant scheme would be available to low-income households.

Thousands of homes and businesses across Canberra were already tipped to have access to stored renewable energy soon in the largest rollout of subsidised battery storage outside Germany.

The ACT government announced plans in December to subsidise the rollout of battery storage to 5000 Canberra homes over five years as it moves towards fully powering Canberra with renewables by 2020.