Unidentified assailants stole 600 meters of wires from two power lines in the Al-Azizia area, south of Tripoli, and Al-Jihad, in the city of Zliten.
The General Electricity Company said that the two incidents occurred on Wednesday night according to a statement.
450 meters of stolen wire supplied 15 transformers in the Azizia and North Azizia districts, the theft led to power cuts to a number of homes and farms.
150 meters of wires stolen on the Al-Jihad line fed four transformers, leading to power cuts to a number of homes.
The company had previously warned of "the increase in theft, looting and attacks on the electrical network during the recent period and in more than one region," adding that these incidents "cause the power to cut off entire neighborhoods and drown them in complete darkness for long hours."