* IEA says OPEC has increased output as prices have risen
* IEA revises upwards oil demand growth, but not by much
* Alaskan pipeline boosting flows towards 500,000 bpd
(Updates throughout)
By Jessica Donati
LONDON, Jan 18 (Reuters) - Oil slipped on Tuesday after the International Energy Agency (IEA) said OPEC members had been quietly raising output and the oil producing group insisted the market was already amply supplied.
North Sea Brent for March <LCOc1> dropped by 11 cents to trade at $97.32 a barrel by 1300 GMT, slipping from morning highs of $98.37 a barrel. The front-month Brent contract on Friday touched $99.20, the highest price since October 2008.
U.S. crude oil <CLc1> prices dipped as deliveries through a key north American supply route, the Trans-Alaskan pipeline restarted, falling by 20 cents to $91.34 a barrel.
The IEA, which advises 28 industrialised countries on energy policy, said in a report some OPEC members appeared already to have boosted production, and that the group's output may quietly increase in the run up to the next scheduled producer meeting in six months' time. [
]The emphasis of the report was broadly bullish however, as the agency revised world oil demand growth in 2011 slightly higher, while reiterating that consumption would not reach the "exceptional levels" of last year. [
]"It looks like OPEC has been increasing production in the past few months in a relatively big way," Credit Agricole CIB analyst Christophe Barret said, "you may now see a change in the market perception regarding OPEC compliance."
INCONSISTENT
The Organization of the Petroleum Exporting Countries, whose members have consistently said the world has enough oil and any price rises were the result of non-fundamental factors, criticised the IEA's conclusions, arguing the agency's position was inconsistent with previous statements.
"In 2009, when the oil price was lower, the IEA had advised its members that they needed to increase petroleum taxes," OPEC's secretary general Abdullah al-Badri said on Tuesday. "So why, today, when they are complaining that oil prices are too high, are they not advising their members to reduce taxes?"
Badri said the oil market rally had been driven by technical matters, including the Alaskan pipeline outage, echoing OPEC's monthly market report on Monday in which it said inventories should rise over the first part of the year. [
]"Also, the weak dollar and speculation have added to this, pushing oil prices higher, especially Brent," Badri continued.
Anticipation OPEC will not take any early action to adjust supplies has given justification to market bulls who have been pushing the market towards $100, especially for Brent, the European benchmark, which has faced tighter supplies than the U.S. marker.
LOSING STEAM?
Some traders said a rally that set in during the last part of 2010 was losing steam.
"It's been going up for two months solidly. $100 is some sort of psychological challenge," said Christopher Bellew of Bache Commodities brokerage, adding "a retracement" was more likely in the near term.
A Reuters technical report showed U.S. crude could fall to $89.51.
U.S. crude has been trading below Brent since August last year, reflecting high levels of inventory at Cushing, Oklahoma, the delivery point for U.S. futures. U.S. supplies should increase following the restoration of flows through Alaska's crude oil pipeline on Monday. [
]The oil price rally has followed stronger equity markets and a weakening of the U.S. dollar, which can stimulate buying of dollar-denominated commodities.
The euro <EUR=> rose slightly against the dollar on Tuesday in response to a stronger-than-expected survey on German economic sentiment. [
] (Additional reporting by Barbara Lewis and Alejandro Barbajosa in Singapore; editing by Christopher Johnson)