The outlook is stable. Fitch assesses Power Grid's standalone profile at 'BBB', it said in a statement.
Fitch's credit ratings range from AAA to D, where triple-A indicates high ability to repay debt while D indicates the least.
It said that Power Grid's ratings benefit from its strong market position. The company owns and operates around 85 per cent of India's inter-regional and inter-state electricity transmission network assets.
Revenue from existing operational transmission assets is based on a return on equity of 15.5 per cent and full pass- through of all fixed costs within regulatory norms, including interest charges.
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Power Grid has had 11 projects awarded through the bidding scheme and aims to complete 10 of them (one project has been discontinued) by 2020. Returns from tariff-based bidding projects are less protected than from existing operational assets under a cost-plus tariff model, it said.
However, Fitch does not expect these projects to account for more than 5 per cent of Power Grid's revenue in the medium term.