THE USE OF ELECTRICITY

And We made a fount of molten copper flow out for him. 

(Qur'an, 34:12)

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.)

Source : MIRACLES OF THE QUR'AN.com