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.