(1) It is recognized that there is no right under the Constitution of Canada to effect the secession of a province from Canada unilaterally and that, therefore, an amendment to the Constitution of Canada would be required for any province to secede from Canada, which in turn would require negotiations involving at least the governments of all of the provinces and the Government of Canada.
"No Minister of the Crown shall propose a constitutional amendment to effect the secession of a province from Canada unless the Government of Canada has addressed, in its negotiations, the terms of secession that are relevant in the circumstances, including the division of assets and liabilities, any changes to the borders of the province, the rights, interests and territorial claims of the Aboriginal peoples of Canada, and the protection of minority rights".
To make a long story short, the rest of Canada gets a veto on whatever Alberta votes for. Then the PM gets a veto too. If Alberta decides they don't care, it's grounds to invoke the Emergencies Act, formerly the War Measures Act, and things get interesting.