The nation's largest lender SBI today said it is gearing up to make available "adequate number" of ₹ 100 notes at all its ATMs and branches within the next two days to help reduce the inconvenience to the public after the government last night scrapped ₹ 500 and ₹ 1,000 banknotes.

SBI Group which includes all its five subsidiaries has 55,000 ATMs and 7,000 cash deposit machines (CDMs). SBI alone has close to 17,000 branches and serves tens of millions of customers.

"We have adequate number of ₹ 100 notes with us. We are working on the logistics to make then available across all our ATMs and branches and we will make them available in the next two days," SBI managing director Rajneesh Kumar told today.

Besides, SBI has over 3,000 PoS machines, where customers can withdraw up to a certain amount, he added.

In a biggest-ever move to curb black money, Prime Minister Narendra Modi last night had announced that ₹ 500 and ₹ 1,000 banknotes would become illegal tenders from last midnight and massively curbed cash withdrawals through ATMs and from bank counters.

The first demonetisation happened under the British rule in 1946 and the first one after the Independence on January 16-17, 1978 when the Morarji government demonetised bank notes of ₹ 1,000, 5,000 and 10,000.

All banks and ATMs will be shut today.

The news triggered panic and people started queueing up at all ATMs or CDMs to either withdraw money or deposit ₹ 500 and ₹ 1,000 notes.

Kumar said people do not have to panic about the ₹ 500 and ₹ 1,000 notes as they can still deposit these notes into their account.

He said however that reconfiguration of the ATMs to be able to dispense new ₹ 500 note and ₹ 2,000 note cannot happen immediately and will take some time.

The ₹ 500 and ₹ 1000 notes account for over 86 per cent of the total ₹ 16.42 lakh crore value of bank notes in circulation as of March 31, 2016, according to Reserve Bank's latest annual report.

Demonetisation declared illegal tender, prompting banks to reconfigure ATMs and prioritise distribution of smaller denomination notes. Demonetisation declared illegal tender led the bank to mobilise logistics to make adequate Rs. 100 notes available across its ATMs, branches and CDMs within two days, while advising customers they may deposit the demonetised high-denomination notes into accounts. Reconfiguration of ATMs to dispense newly specified denominations cannot be completed immediately and will take time, causing temporary interruptions to ATM and counter services amid heightened public demand.