UPDATE 1-S.Korean firms to spend over 4 trln won in clean tech

* Investment to rise from 3.2 trln won in 2009

* Govt to help higher investment with policy making

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SEOUL, Dec 21 (Reuters) - South Korean manufacturing companies will invest more than 4 trillion won ($3.42 billion) in clean technology sectors next year, up from 3.2 trillion won this year, data from the Korean government showed on Monday.

The investments include spending on clean technology research and development and manufacturing facilities for solar cells, wind power and hydro-fuel cells, a government official said, adding that the data was gathered from a survey of Korean companies.

"The government will help private firms raise their investment in clean technology by preparing new policies to expand the industries, for instance requiring public buildings to consume renewable energy," said an official with the ministry of knowledge economy.

But the government has no plan yet for direct financial incentives for such investment, he added.

"The government would rather help more private funds to be spent in clean and renewable energy sectors as lots of private funds are already out there."

He noted the parliament was reviewing the government's bill, called the Renewable Portfolio Standard (RPS), to require energy businesses to provide a certain percentage of renewable energy in their energy supplies. ($1=1171.2 Won)

(Reporting by Cho Mee-young)