As many as 1.2 million homes could have new battery storage systems within five years under a Greens proposal costing almost $3 billion to be paid for by the aviation and fossil fuel industries.

The Greens will use the storage policy in its negotiations with the government over its budget, Greens energy spokesman Adam Bandt said.

To support people adding batteries, the Greens want a 50 per cent refundable tax credit for individuals to pay for as much as half the cost of a new storage system. The payments would taper off from a maximum of $5000 to $1500 over the five years to 2021 in line with an expected drop of battery prices.

"Now is the time to jumpstart the battery industry, encourage the take up of storage and help make Australia a renewable energy leader," Mr Bandt said.