"The minister feels that the government guarantees their (contractors) loans and their investments are also secured, as the government bears the risk and the government does not benefit out of it," said the official.
The Planning Commission is currently reviewing the annuity model, which has been successfully used in the US and Europe.
The industry feels that in the Indian conditions all the three models -- toll, annuity and EPC -- are needed.
"Our condition is such that we cannot do away by phasing out annuity. Also, EPC cannot take annuity's place because the liability of the contractors in EPC projects is almost zero and that is precisely many EPC projects in the past took ages to complete," said secretary general, National Highways Builders Federation, M Murali.
Under NHAI's work plan, 20 per cent of projects would be awarded on BOT annuity, 65 per cent on BOT toll and the rest on EPC basis.
With this, the annuity outgo of NHAI is expected to increase to around Rs 13,000 crore (Rs 130 billion).
NHAI also does not see much merit in shifting away from annuity.
"Our Viability Gap Funding payment will automatically increase, if we are to award more projects on toll. Increase in VGF amount raises another concern," said a senior NHAI official, who did not want to be identified.
Gajendra Haldea, advisor to the Planning Commission deputy chairman, had in a paper expressed apprehension that NHAI would become 'bankrupt', as it is awarding a number of projects on VGF.
According to the paper, the highway authority is expected to have an outgo of about Rs 50,000 crore (Rs 500 billion) over the next three years, whereas the cess used to finance it -- Rs 2 on the sale of each litre of diesel and petrol -- may not exceed Rs 25,000 crore (Rs 250 billion) during the period.
NHAI will have to take on a debt of Rs 25,000 crore (Rs 250 billion), in addition to the Rs 5,000 crore (Rs 50 billion) already on its books, to bridge this gap.