KYIV, Aug 9 – Naftogaz Ukrayiny has accumulated 13.4 billion cubic meters (bcm) of natural gas in the underground storage facilities and with the current pumping pace the company would accumulate 16 bcm by the 2017/18 heating season, Naftogaz Chief Commercial Director Yuriy Vitrenko has said.

"Now we are pumping even more than we planned. Now we could reach 16 bcm, maybe this is too much," he said on Channel 5 TV late on Monday.