“The fact is that the nation’s 21st century energy renaissance, which has made domestically produced natural gas cheap and abundant, has helped us achieve substantial and sustained emissions reductions without command and control style regulatory intervention,” said Gerard. “By contrast, the administration continues to hew to last century’s thinking that increased energy production and achieving climate goals are mutually exclusive, pursuing costly government mandates to detriment of the American consumer and our economy.

OPEC’s board of governors was unable to agree on the group’s long-term strategy plan and won’t present it to oil ministers when they meet on Dec. 4 in Vienna, two OPEC delegates with knowledge of the matter said.

“The drop in prices won’t be a concern for us,” Zanganeh said. “It should be a concern for those who have replaced Iran.” Iran doesn’t expect difficulties selling the additional barrels, and “the market has taken into account our return,” he said.

Credit crunch was expected to hit many independent U.S. oil producers, starving the industry of billions of dollars and further denting company budgets and drilling plans.

The U.K. government will make keeping the lights on the top priority with natural gas and nuclear power playing a central role in that goal, Energy and Climate Change Secretary Amber Rudd is expected to say in a major speech later Wednesday setting out a new energy policy for the country.

Gazprom would need to bring spot gas prices below $4 per million British thermal units (mmBtu), versus around $5.65 per mmBtu now, to shut Europe off to U.S. imports - a level Goldman Sachs expects could be reached by 2018/2019.

Gabriel explained that he would ensure that construction of the pipeline would remain legal in the eyes of the German authorities. Gabriel also made it clear that Brussels should have limited involvement with the project.

Iran said in September it had approved a draft of international oil and gas contracts to attract foreign investors and oil buyers once international sanctions are lifted but has not provided details so far.

The country produced 44.5 million tons of petrochemicals in the past Iranian calendar year (ended on March 20, 2015), with over 10 percent rise from 40.5 million tons in its preceding year.

Tehran has recently strengthened ties with Moscow, which is considering providing two loans worth a total of $7 billion to Iran.