"Its strategic importance and close relationship with the government enhances its credit profile. NTPC's ratings are thus highly correlated with India's sovereign ratings," Moody's Investors Service said.
NTPC's rating could be upgraded if India's sovereign rating is upgraded and if the PSU's underlying credit quality remains in line with its current baseline credit assessment (BCA) of Baa3.
In the absence of any upgrade to the sovereign rating, an upgrade to NTPC's rating is very unlikely because the company's business profile is highly dependent on India's economy.
Although NTPC's financial profile is strong, it has been weakening as a result of capex. Hence, continued deterioration in its financial profile will exert pressure on the rating.
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Furthermore, a rating downgrade could result if the government reduces its stake in NTPC to below 50 per cent, or evidence emerges of a weakening in government support.
"NTPC's Baa3 rating reflects its baseline credit assessment (BCA) of baa3. The rating does not factor in any uplift from the government due to the high baa3 BCA relative to the Baa3 sovereign rating," it said.
"In April, 2015, we changed the outlook on ratings of NTPC to positive following the change in outlook for the India's Baa3 ratings to positive," it said.