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

TransAlta Corporation (symbol: TAC) was one of the biggest winners of the
trading day today (2015-11-23), gaining 10.57%. The number of shares that
changed hands was 501,135, or about 2.2 times the average daily volume in
the stock.
The closing price was $4.5, amounting to a market cap of $1,280,000,000,
about -56.65% off the highest price in the last 12 months. The stock has
been trading at a range between $3.95 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 9.36 times earnings.