Constitutional practicability of referendum on EU Constitution

Yes. Binding referendum provided for several cases and especially if the conditions of Latvias membership in the EU change significantly. Otherwise referendum on international treaties expressly excluded. Consultative referendum can anyhow be held if ordered by ad-hoc-law.

Regulation about a special transfer of sovereignty to EU

none

Approval of transfer of sovereignty without effect of constitutional amendment

Majority of votes from parliament, Art. 68, 24 ConstLatvia.

Approval of transfer of sovereignty with effect of constitutional amendment

Not expressly regulated, but constitutional amendment required.

Approval of constitutional amendment

Majority of 2/3 of the votes by presence of at least 2/3 of the members initiated by the parliament, Art. 76 ConstLatvia. Amendment can also be initiated by 1/10 of the electorates. If the parliament refuses this amendment a referendum has to be called, Art. 78 ConstLatvia. Amendment has to be approved by the majority of all electors, Art. 79 ConstLatvia. For amendment of fundamental principles of the constitution approval by a referendum required, Art. 77 ConstLatvia.

Other constitutional regulations about referendums

Referendum on laws can be called on proposal of 1/10 of the electorate, Art. 72, 74, 75 ConstLatvia. Dissolution of parliament by the president has to be approved by Referendum, Art. 48 ConstLatvia. Referendum on agreements with other nations is expressly excluded, Art. 73 ConstLatvia. Substantial changes in the terms regarding the membership of Latvia in the European Union shall be decided by a national referendum if such referendum is requested by at least one-half of the members of the Saeima. But substantial changes in the terms regarding the membership in the European Union shall be decided by a national referendum if requested by half of the members of parliament, Art. 68 IV ConstLatvia.