Who manufactures voltage?

Excuse me, could you elaborate on the statement "Who manufactures voltage?"? Voltage, as an electrical term, refers to the difference in electric potential between two points in an electric field, and is not something that can be manufactured in the traditional sense. It's more of a property or characteristic of an electrical circuit or system. Are you perhaps asking about the creation of electrical power, or the manufacturers of electrical components and systems that utilize voltage? Clarification would be helpful in providing a more accurate response.