(Adds details; updates prices)
Jan 12 (Reuters) - Canada's main stock index rose on Tuesday, helped by gains in energy stocks, as oil prices hit an 11-month high on tighter supply and hopes of a drop in U.S. stockpile.
* The energy sector .SPTTEN climbed 1% as U.S. crude CLc1 prices were up 0.9% a barrel, while Brent crude LCOc1 added 1%. O/R
* At 9:38 a.m. ET (14:38 GMT), the Toronto Stock Exchange's S&P/TSX composite index .GSPTSE was up 20.75 points, or 0.12%, at 17,955.2.
* The largest percentage gainer on the TSX was fuel cell developer Ballard Power Systems Inc BLDP.TO , which jumped 13.1% to its highest since 2002, after receiving a purchase order from UK-based Arcola Energy. Its gains were followed by asset and wealth management company CI Financial Corp CIX.TO , which rose 5.9%.
* The financials sector .SPTTFS gained 0.3%, while the industrials sector .GSPTTIN fell 0.2%.
* On the TSX, 115 issues rose, while 91 issues fell in a 1.26-to-1 ratio favoring gainers, with 14.93 million shares traded.
* Ritchie Bros. Auctioneers Inc RBA.TO fell 5.2%, the most on the TSX, after brokerage Scotiabank downgraded its rating to "sector perform" from "sector outperform". The second biggest decliner was pot producer Cronos Group Inc CRON.TO , down 1.5%.
* The most heavily traded shares by volume were Toronto-Dominion Bank TD.TO , Nevada Copper Corp NCU.TO , and Zenabis Global Inc ZENA.TO .
* The TSX posted four new 52-week highs and no new low.
* Across Canadian issues, there were 33 new 52-week highs and one new low, with total volume of 35.87 million shares.