UPDATE 1-India's NTPC plans capacity addition, capex

* Plans FY11 capex of 280-290 bln rupees ($6.3-$6.5 bln)

* Says 70 pct of capex to be met through debt

* Ties up 75 pct of debt component, mostly from local banks (Adds details, quote)

NEW DELHI, April 6 (Reuters) - India's top power utility NTPC Ltd (NTPC.BO) plans to add 4,000-4,500 mega watt generation capacity in the current fiscal year to March, the state-run firm's chairman R.S. Sharma said on Tuesday.

For the current financial year, the company plans capital expenditure of 280-290 billion rupees ($6.3-$6.5 billion), 70 percent of which will be met through debt, Sharma said.

"Seventy-five percent of our total debt component has already been tied up, mainly from local banks and financial institutions," he said.

The company had added 1,000 MW capacity in the 2009/10 financial year.

NTPC is open to raising funds from overseas, depending on rates and market conditions, Sharma said. ($1=44.4 Indian rupees) (Reporting by Nidhi Verma; editing by Malini Menon)