Floods in western India have forced the closure of a natural gas plant and some petrochemical factories, officials say.
The floods have displaced thousands of people
Oil and Natural Gas Corporation says it has closed a gas plant, while the private Reliance Industries has shut some petrochemical plants.
Heavy rains over the past two weeks have displaced many people in different states. At least 100 people are estimated to have been killed.
The army, navy and air force have been deployed in flood affected areas.
State-run Oil and Natural Gas Corporation (ONGC)'s natural gas plant in Hazira in the western state of Gujarat was shut down on Tuesday morning after flood waters entered the complex.
"Water has not receded. All communication channels have broken down. We are trying to restart as quickly as possible. Hopefully, the water should recede in a couple of days," ONGC chairman RS Sharma told Reuters news agency.
The plant at Hazira accounts for two-thirds of the natural gas supplied to domestic consumers in India, analysts say.
Heavy rain and flooding also forced the privately-run Reliance Industries to shut some petrochemical plants in Hazira.
Andhra Pradesh is one of the worst affected states
Congress party chief Sonia Gandhi has begun a visit of southern state of Andhra Pradesh - one of the worst affected by the floods.
A senior local official Priyadarshini told the AFP news agency that over 500,000 people had been displaced by the heavy rains and over 100 people had died over the past week.
In the western state of Gujarat, thousands of people have been evacuated from the city of Surat, known the world over for its diamond polishing industry.
In neighbouring Maharashtra state, thousands have been left homeless by the torrential rains in 15 of the state's 35 districts.
Floods have also forced the evacuation of 200 villages in the central states of Chhattisgarh and Madhya Pradesh.