UPDATE 1-Doosan spends on clean energy, sees nuclear deals

* Doosan Heavy to spend $605 mln more on clean energy

* Expects nuclear power equipment deals in U.S., China

* Doosan Infracore targets China with hybrid excavators (Adds details, quotes, Doosan Infracore)

SEOUL, Nov 16 (Reuters) - South Korean power plant and equipment firm Doosan Heavy Industries & Construction (034020.KS) will invest an additional 700 billion won ($605.4 million) in clean energy by 2013, company executives said.

As global heavyweights such as GE Energy and Siemens (SIEGn.DE) as well as new players flock into renewable energy for future growth, Doosan is focusing on wind power generators, biogas and technologies to boost power plant efficiency.

In 2015, Doosan Heavy aims to generate about 1 trillion won in sales, or 10 percent of its power generation unit's revenue, from clean energy. It has already spent some 300 billion won in the area since 2004.

"By 2020, we aim at more than 1 trillion won in annual revenue from wind power only, to become the world's No. 10 (wind power equipment) supplier," said Choe Seung-joo, Doosan Heavy's senior vice president.

The financial crisis has seen the delay or suspension of some power plant projects, but Doosan Heavy forecast a recovery in new orders from the second quarter of next year.

The company expects to win five to six new orders for nuclear power plant equipment in the United States and China in 2010.

In 2008, Doosan Heavy won equipment orders for three U.S. nuclear plant projects.

Doosan Group's construction equipment unit Doosan Infracore (042670.KS) plans to produce and sell fuel-saving hybrid excavators starting 2011, targetting the fast-growing China market, another executive said.

Jo Doo-yearn, chief technology officer at Doosan Infracore, told reporters that its hybrid model would compete with similar machines from Japanese rival Komatsu (6301.T) and will be more competitively priced.

Doosan Infracore, which bought compact construction equipment firm Bobcat and other units from U.S. conglomerate Ingersoll-Rand for $4.9 billion in 2007, is the world's No. 4 excavator maker.

It leads the Chinese excavator market by a thin margin but faces tough competition as larger rivals such as Caterpillar (CAT.N) beef up their China presence.

On Monday, shares in Doosan Heavy rose 2.31 percent and Doosan Infracore jumped 4.55 percent, leading the wider market's 1.3 percent rise. ($1=1156.3 Won) (Reporting by Rhee So-eui; Editing by Jonathan Hopfner)