generators

The title of my post is quite self explanatory-what i'd like to know is whether its safe or not to operate a computer on electricity that is produced by the typical generators which are often used to supply power to small /medium sized buildings during blackouts. A technician i knew once said...

just want to know whether anyone in the forum uses some other source of electricity other than state electricity board and commercial generators. something like small hydal power plants or solar power.