Islamic Prophecies: The use of electricity
Looking again at the verse in context:
One of Allah's great blessings to Prophet Sulayman (as) was "a fount of molten copper." This can be understood in several senses. By the use of melted copper, it may be referring to the existence, at his time, of an advanced technology that employed electricity. We know that copper is one of the best metals for conducting electricity and heat, and thus constitutes the basis of the electrical industry, which uses much of the copper produced in the world. The expression "flow out" may indicate that electricity can be used in many fields. (Allah knows best.)
Saying: Make ample (coats of mail), and assign a time to the making of coats of mail and do good; surely I am Seeing what you do. And (We made) the wind (subservient) to Sulaiman, which made a month's journey in the morning and a month's journey m the evening, and We made a fountain of molten copper to flow out for him, and of the jinn there were those who worked before him by the command of his Lord; and whoever turned aside from Our command from among them, We made him taste of the punishment of burning.
This verse is talking about Solomon's journey on his giant wooden carpet (along with his troops, camels and possessions). The Jinn apparently were made to manufacture items/goods for Solomon, including coats of mail. This is what the “molten copper” is referring to.
This is part of the Quranic Solomon's story. In context the “fountains of copper” refer to the metal work done by the Jinn's. This has nothing to do with electricity or prophecy.