Nigeria presently has about 5000MW of power connected to the grid coming from various generation plants across the country. These generation sources are geographically located in 12 states out of the 36 states of the federation. According to data from the advisory Power Team in the office of the Vice President, Prof. Yemi Osinbajo, about 29 power generation plants are currently in operation in 12 states having an overall generation capacity of 12,000MW of power as at 2017.
The 12 states, which host power stations that generate the power used across the country, are Niger, Lagos, Ogun, Rivers, Abia, Imo, Ondo, Cross River, Bayelsa, Edo, Kogi, and Delta. The power stations are;
- Niger state houses three power stations namely; Kainji, Jebba and Shiroro power stations. Kainji hydro power station was completed in 1968, with an installed generation capacity of 760MW. Jebba power station was commissioned in 1985, with an installed generating capacity of 576.8MW and Shiroro power station which was completed in 1990 and has a generating capacity of 600MW.
- In Lagos, there is the Egbin gas power station which is currently the largest generation plant in the country was completed in 1986 and has an installed capacity of 1,320MW. Also, there is the AES barge Independent Power Plant (IPP) completed about 2001, with an installed capacity of 270MW and the Paras Energy Plant.
- Ogun State has the Olorunsogo power station which was completed in 2007, with an installed capacity of 335MW, as well as the Olorunsogo-2 built under the National Integrated Power Projects (NIPP) by the Niger Delta Power Holding Company (NDPHC), which is owned by the three tiers of government in the federation and have a capacity of 675MW.
- Delta State houses the Sapele power station built in 1981 with a capacity of 1,020MW, Transcorp Ughelli power station reportedly built between 1966 and 1990 with a 972MW installed capacity 480MW Okpai power station completed in 2005 as an IPP by Agip Oil Company and the 450MW Sapele NIPP plant.
- In Rivers, there is the 977MW Afam I-IV and V power plants were completed between 1982 and 2002, which also has the 642MW Afam VI power plant owned by the Shell Petroleum Development Company (SPDC) Joint Ventures; 150MW Omoku power station; 136MW Trans-Amadi power station; 180MW Rivers IPP, and Omoku-2 NIPP plant with installed generating capacity of 225MW.
- In Kogi, there is the 414MW Geregu-1 power station and 434MW Geregu-2 II NIPP power station.
- Ondo has the 335MW Omotosho-1 power station and 450MW Omotosho NIPP power station.
- In Abia, there is the 1074MW Alaoji NIPP power station.
- In Edo, there is the 450MW NIPP Ihovbor power station and another 450MW power station built by Azura Power.
- Imo has the 338MW NIPP Egbema power station.
- In Cross River there is the 561MW NIPP Calabar power station.
- Bayelsa has the 225MW NIPP Gbarain power plant.