Found this from the Belize international financial services commision:
http://www.ifsc.gov.bz/belize.html

Quote
Electric Power: Belize Electricity Limited; Voltage 110 Volts, Optional 220 Volts; Cost of Kwh: Bz$ 0.38(US$0.19). Type of Generating: Diesel. Continuity: 90% - 95%. Industrial Rate is available.

Here is additional info from the Canadian Ministry of Foreign Affairs and International Trade (Ministere des Affaires Etrangeres et du Commerce international):
http://www.dfait-maeci.gc.ca/latinamerica/belizeexport-en.asp

Quote
Electricity/Voltage

Belize Electricity Ltd. (BEL) is the main supplier of electricity. Domestic electricity is supplied at 110/220 volts two or three wire single phase service, and 220 or 440 volts four wire 3-phase service, all at 60 HZ.

[This message has been edited by SvenNYC (edited 05-19-2003).]