Onion prices have risen to about Rs 25-30 per kg in the national capital from Rs 15-20 per kg a fortnight ago.
The MEP, which is the rate below which no exports are allowed, has been re-introduced barely three months after the previous government had abolished it in March.
Export of all onion varieties will be subject to MEP of USD 300 per tonne, the Commerce Ministry said in a notification.
"The Commerce Ministry has imposed a minimum export price (MEP) of USD 300 per tonne on onions to curb exports," Consumer Affairs Secretary Keshav Desiraju said after a meeting on 'measures taken to tackle food inflation' at the PMO.
Rising prices of essential food items like vegetables, fruits and cereals, pushed up wholesale price index based inflation to five-month high of 6.01 percent in May.
Stating that country exports on an average 15 lakh tones of onions a year, he said, "The MEP is expected to have some impact on increasing domestic supply and check rising prices.”
Desiraju said the Consumer Affairs department, which monitors both retail and wholesale prices of food items, has flagged concern about price rise in onion to concerned departments and suggested urgent measures to check prices.
"Price rise in onion is not alarming now but we have to be careful and the government is alert," he said.     

In the meeting, the principal secretary to the Prime Minister discussed various measures taken by concerned departments to address food inflation, sources said.
Secretaries from Agriculture, Consumer Affairs and Commerce Ministries were present in the meeting.
The Centre had imposed MEP on onion in September 2013 and then it was raised several times to curb exports as retail prices had shot up as high as Rs 100 per kg in major parts of the country. The country had to even import onion.
India produces around 17-18 million tonnes of onion a year. During last fiscal, India exported 13.58 lakh tonnes of onion against 18.22 lakh tonnes in the previous year.


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