The Transmission Company of Nigeria (TCN) has disclosed that the national grid has been restored. While explaining the cause of the incident, the TCN said it was due to “a sudden drop in system frequency, which created instability.The restoration of the affected part of the grid commenced immediately with Osogbo/Ihovbor back to the grid followed by Jebba/Osogbo, Kainji/Jebba, Benin/Onisha, Shiroro/Kaduna, Shiroro/Katampe, and Alaoji/Ikot-Ekpene....