http://www.dfait-maeci.gc.ca/nafta-ALENA/chap06-en.aspArticle 605: Other Export Measures
Subject to Annex 605 (GG - which excludes Mexico), a Party may adopt or maintain a restriction otherwise justified under Article XI:2(a) or XX(g), (i) or (j) of the GATT with respect to the export of an energy or basic petrochemical good to the territory of another Party, only if:
(a) the restriction does not reduce the proportion of the total export shipments of the specific energy or basic petrochemical good made available to that other Party relative to the total supply of that good of the Party maintaining the restriction as compared to the proportion prevailing in the most recent 36-month period for which data are available prior to the imposition of the measure, or in such other representative period on which the Parties may agree;
(b) the Party does not impose a higher price for exports of an energy or basic petrochemical good to that other Party than the price charged for such good when consumed domestically, by means of any measure such as licenses, fees, taxation and minimum price requirements. The foregoing provision does not apply to a higher price that may result from a measure taken pursuant to subparagraph (a) that only restricts the volume of exports; and
(c) the restriction does not require the disruption of normal channels of supply to that other Party or normal proportions among specific energy or basic petrochemical goods supplied to that other Party, such as, for example,between crude oil and refined products and among different categories of crude oil and of refined products.
Basically this means that we must continue to ship the same
proportion of our total production of oil and natural gas to the USA. If our total suppy declines (or we decide to cut back production) we can reduce shipments to the USA, but only if we take the same proportional cut in our domestic supply. It also means that we can't subsidize domestic consumption.
NAFTA will not force us to disadvantage ourselves relative to our participation in the world energy market, but it prevents us from giving ourselves any relative advantages with our own resources.
The anthemic phrase "Let the Eastern bastards freeze in the dark" was popularized in Alberta during the time of Peter Lougheed in 1980 as a response to Pierre Trudeau's National Energy Program.
http://en.wikipedia.org/wiki/National_Energy_Program.