ERHC Energy Inc (ERHE)

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You're thinking of Europe where it can be different in terms of voltage but it is the same across North America.

Many travelers to Europe have had difficulties with their electronics, because European and American power systems are run differently. Most of the world, including Europe, uses a 220 volt/50 hertz system. A handful of other countries, including the United States, have 110 volt/60 hertz electricity, which is believed to be safer. As a result, appliances in these nations are designed to connect to a specific type of power source, and using American devices in European outlets and vice versa can result in havoc.