NEW YORK ( TheStreet) -- Niska Gas Storage Partners (NYSE: NKA) is trading at unusually high volume Thursday with 1.1 million shares changing hands. It is currently at 4.1 times its average daily volume and trading down $2.72 (-18.5%) at $12 as of 11:45 a.m. ET. Niska Gas has a market cap of $482.7 million and is part of the utilities sector and utilities industry. Shares are down 26.2% year to date as of the close of trading on Wednesday. Niska Gas Storage Partners LLC owns and operates natural gas storage assets in North America. It owns or contracts for approximately 185.5 billion cubic feet of total gas storage capacity. The company has a P/E ratio of 46.1, above the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Niska Gas as a sell. The company's weaknesses can be seen in multiple areas, such as its generally disappointing historical performance in the stock itself, unimpressive growth in net income, weak operating cash flow and feeble growth in its earnings per share. You can view the full Niska Gas Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center. Interested in other stocks that are falling on unusually high volume? Get free SMS text alerts sent to you when the action happens by texting HVDOWN to 95370 or select from multiple alert options.