* Global carbon market value up 11 pct on year
* EU carbon market value rises to $148 bln
* Secondary emissions offset volumes rise 43 pct (Adds quote from BVRio executive in paragraph 12)
By Jeff Coelho
COLOGNE, Germany, May 30 (Reuters) - Carbon market trading rose 11 percent to a record value of $176 billion in 2011 as an increase in secondary trading volumes offset lower prices and slowing economies, the World Bank said on Wednesday.
Companies and governments are turning to emissions trading as a tool for fighting climate change, with the European Union by far the most active since its cap-and-trade scheme began in 2005.
A record number of emissions products were traded in 2011, even though prices of EU carbon permits and international offsets plumbed new depths well below $10 a tonne late in the year, the bank said in its annual report on carbon markets.
Worldwide emissions trading last year rose 17 percent in volume to 10.3 billion tonnes of carbon dioxide equivalent, with permits in the EU Emissions Trading Scheme (ETS) accounting for more than three quarters of the total.
The rise in volume lifted the value of the EU market to $148 billion from a revised $134 billion in 2010, even though average EU carbon prices fell 4 percent year on year to $18.80 a tonne.
Carbon markets were not immune to recent global economic volatility from the Arab Spring, Japan's Fukushima nuclear disaster and the euro zone debt crisis, the World Bank report said.
"A considerable portion of the trades is primarily motivated by hedging, portfolio adjustments, profit-taking and arbitrage," it said.
But if carbon prices continue to remain below $10 a tonne, there will be little incentive for companies and governments to invest in low-carbon projects, a bank official said.
"There is a question over whether (prices) are high enough to support new projects coming in," Alexandre Kossoy, senior financial specialist with the World Bank's Carbon Finance Unit, told reporters in an industry conference.
He said carbon prices could rise if the EU agreed to toughen its 2020 emissions-reduction ambitions or took other policy measures to rebalance a massive oversupply of carbon units, which is likely to last until 2020.
But front-year EU carbon prices are averaging under $10 a tonne so far this year as the bloc's sluggish economy dampens demand for carbon permits in a market that analysts say has accumulated a surplus near the equivalent of 1 billion tonnes.
"We are in a very difficult situation where we don't have any positive price signal coming from the international community," said Pedro Moura Costa, executive president of Rio de Janeiro's environmental commodity exchange, BVRio.
Other national and regional carbon schemes showed mixed results. New Zealand's carbon market value tripled to $351 million, while the Regional Greenhouse Gas Initiative in North America nearly halved to $249 million, the bank said.
Secondary trading volumes for international offsets regulated by the United Nations also soared in 2011, rising 43 percent year on year to 1.8 billion units valued at $23 billion.
The main reason for this was a rise in demand for U.N.-backed emissions offsets, because a certain number of the credits can be used for compliance in markets such as the EU ETS.
Average offset prices, which trade at a discount to EU carbon prices, fell 21 percent year on year to $12.80 a tonne as a record number of credits were issued last year.
The Clean Development Mechanism (CDM), which paves the way for investments in emission-reduction projects in developing nations, is the biggest offset market. It accounted for over 95 percent of total spot and secondary emissions offset trading.
Direct pre-2013 CDM project-based transactions declined to under $1 billion in 2011 from $1.5 billion in the previous year as its 2008-2012 commitment period draws to an end.
Primary investment in post-2012 CDM offsets, however, rose to nearly $2 billion in 2011 from $1.2 billion, despite depressed prices and uncertainty about the future of the Kyoto Protocol and its market mechanisms such as the CDM.
U.N. climate talks in South Africa last year reached agreement on a package of measures that would extend Kyoto, a global pact enforcing carbon cuts, and decide on a new, legally binding accord by 2015, coming into force by 2020.
The World Bank suggested recent and emerging cap-and-trade schemes in Australia, California, Mexico, South Korea and Quebec could contribute to future growth in overall carbon trading.
Primary project-based transactions in the voluntary offset market were valued at $569 million in 2011, up 37 percent, the bank said. ($1 = 0.7977 euros) (Editing by Jason Neely and Jane Baird)