Companies will also face higher borrowing costs and tight funding conditions with monetary policy likely to remain tight, it said.
Moody's could move to a stable outlook if its GDP growth expectations exceed 6 per cent, the Indian rupee stabilises – such that one-year volatility falls below 5 per cent – and a development and reform-focused government is formed with a strong majority, it said.
"Heightened expectation of a scale back of quantitative easing by the Federal Reserve in 2014 to keep the Indian rupee volatile, making the operating environment more challenging for importers and exporters," the agency said in its report.
Indian exploration and production companies are likely to continue their acquisition spree to secure the country's energy needs, it said adding there was substantial headroom under their current ratings for further buys.
A near doubling of gas prices from April 2014 will lift upstream revenues, with Oil and Natural Gas Corporation seeing the largest boost. However, the fuel subsidy burden on the upstream companies may remain high, despite an expected decline in total fuel subsidies, it said.
Moody's outlook for the sector is stable.
The outlook is negative in the refining and marketing sector, where it expects refining margins to stay weak and for companies to suffer delays in subsidy reimbursements due to the mid-year elections.
Meanwhile, the weaker rupee has improved competitiveness for the IT/business process outsourcing sector, where the sector outlook is stable, it said.
Moody's outlook is negative for the steel, metals and mining sectors, where it expects the weak economy and capacity expansions to weigh on steelmakers' margins and utilisation rates.
It also has a negative outlook for the automotive sector, as it expects demand to remain weak while giving 'stable outlook' for the telecommunications sector, where it expects average revenue per user and EBITDA margins to improve.