$TAC is one of biggest losers #stocks today. read more:

TransAlta Corporation Ordinary (symbol: TAC) was one of the worst losers of
the trading day today (2016-01-18), losing -14.75%. The number of shares
that changed hands was 427,453, or about 2 times the average daily volume
in the stock.
The closing price was $2.6, amounting to a market cap of $738,660,000,
about -74.95% off the highest price in the last 12 months. The stock has
been trading at a range between $2.58 and $10.38.
TAC is in the Electric Utilities: Central industry, part of the Public
Utilities sector.
Looking at its valuation, the stock is now trading at 5.83 times earnings.