"We continue to examine suitable opportunities for our minority stake in Cerrejon," it said, referring to a Colombian mining venture with BHP, Anglo American and Glencore.

Sasol said it was implementing an "emission-reduction framework underpinned by short and medium-term targets," although it said coal would continue to play role in South Africa during a transition to lower-carbon energy sources.

Enel said it was developing its business in line with the Paris climate accords, which seek to limit the rise in global temperatures to 1.5 degrees Celsius and cut emissions to zero by 2050.

Uniper said it was in a dialogue with the fund about being under observation for possible exclusion.

"Uniper in its strategic new focus has presented a clear exit plan from coal and aims for climate-neutral power production in Europe by 2035," said a company spokesman.

RWE said it had cut carbon dioxide emissions by 90 million tonnes since 2012 and committed itself to becoming climate neutral by 2040. It was investing around 5 billion euros in the expansion of renewables up to 2022.

"Instead of quantitative stock-taking, the speed with which a company changes should be considered in our view," said the company spokesman. "Already today, we are among the globally leading companies for renewable energies."

Vistra Energy said it was looking forward to engaging with the fund about sustainability as it was in the process of transitioning away from coal, to a level that would put it well below the threshold that put the company on the fund's watch list.

Glencore, BHP and AGL Energy declined to comment.

Canadian Natural Resources, Cenovus Energy, Suncor Energy and Imperial Oil did not respond to requests for comment