Attention Business Editors:

OPTI Canada to Present at Tristone Capital's energie '08 Global Energy Forum

    TSX: OPC

    CALGARY, May 13 /CNW/ - David Halford, Chief Financial Officer of
OPTI Canada Inc. (OPTI), will present an overview of the Company and provide
progress to date on OPTI's Long Lake Project at the Tristone Capital
énergie '08 Global Energy Forum. The presentation will take place on Thursday,
May 15th at 9:40 a.m. Central European Daylight Time from the
InterContinental/Paris Le Grand hotel in Paris, France.
    The presentation will be audio broadcast via live and archived webcast
and may be accessed at:
https://tristonecapital-ls.webex.com/tristonecapital-ls/onstage/g.php?p(equal 
sign)2&t=m. The webcast will also be available on the OPTI website
located under "Presentations and Webcasts" within the Investors section for a
period of 30 days.

    About OPTI

    OPTI Canada Inc. is a Calgary, Alberta-based company focused on
developing the fourth and next major integrated oil sands project in Canada,
the Long Lake Project, in a 50/50 joint venture with Nexen Inc. The first
phase of the Project consists of 72,000 barrels per day of SAGD (steam
assisted gravity drainage) oil production integrated with an OPTI-operated
upgrading facility, using OPTI's proprietary OrCrude(TM) process and
commercially available hydrocracking and gasification. Through gasification,
this configuration substantially reduces the exposure to and the need to
purchase natural gas. The Project is expected to produce 58,500 bbl/d of
products, primarily 39 degree API Premium Sweet Crude with low sulphur
content, making it a highly desirable refinery feedstock. OPTI's common shares
trade on the Toronto Stock Exchange under the symbol OPC.
    Additional information regarding the Long Lake Project is available at
http://www.longlake.ca.

    Forward-Looking Statements

    Certain statements contained herein are forward-looking statements,
including statements relating to: OPTI's operations; business prospects,
expansion plans and strategies; OPTI's plans and expectations concerning the
use and performance of the OrCrude(TM) process and other related technologies;
the cost, development and operation of the Long Lake Project and OPTI's
relationship with Nexen Inc. Forward-looking information typically contains
statements with words such as "intends," "anticipate," "estimate," "expect,"
"potential," "could," "plan" or similar words suggesting future outcomes.
Readers are cautioned not to place undue reliance on forward-looking
information because it is possible that expectations, predictions, forecasts,
projections and other forms of forward-looking information will not be
achieved by OPTI. By its nature, forward-looking information involves numerous
assumptions, inherent risks and uncertainties. A change in any one of these
factors could cause actual events or results to differ materially from those
projected in the forward-looking information. Although OPTI believes that the
expectations reflected in such forward-looking statements are reasonable, OPTI
can give no assurance that such expectations will prove to be correct.
Forward-looking statements are based on current expectations, estimates and
projections that involve a number of risks and uncertainties which could cause
actual results to differ materially from those anticipated by OPTI and
described in the forward-looking statements or information. The
forward-looking statements are based on a number of assumptions which may
prove to be incorrect. In addition to other assumptions identified herein, we
have made assumptions regarding, among other things: market costs and other
variables affecting operating costs of the Project; the ability of the Long
Lake joint venture partners to obtain equipment, services and supplies,
including labour, in a timely and cost-effective manner; the availability and
costs of financing; oil prices and market price for the PSC(TM) output of the
OrCrude(TM) Upgrader; foreign currency exchange rates and hedging risks;
government regulations and royalty regimes; the degree of risk that
governmental approvals may be delayed or withheld; other risks and
uncertainties described elsewhere in this document or in OPTI's other filings
with Canadian securities authorities.
    Readers should be aware that the list of factors, risks and uncertainties
set forth above are not exhaustive. Readers should refer to OPTI's current
Annual Information Form, which is available at www.sedar.com, for a detailed
discussion of these factors, risks and uncertainties. The forward-looking
statements or information contained in this document are made as of the date
hereof and OPTI undertakes no obligation to update publicly or revise any
forward-looking statements or information, whether as a result of new
information, future events or otherwise, unless so required by applicable laws
or regulatory policies.

For further information: Alison Trollope, Investor Relations Manager,
(403) 218-4705; OPTI Canada Inc., Suite 2100, 555 - 4th Ave. S.W., Calgary,
Alberta, Canada, T2P 3E7