TOKYO, Oct 3 (Reuters) - Shikoku Electric Power Co said it shut its Ikata No. 3 reactor on Tuesday for planned maintenance. The company expects the 890-megawatt No.3 reactor to resume power generation from around Jan. 22, with commercial operations likely to resume around Feb. 20, it said. Many of Japan's reactors are still going through a relicensing process following the 2011 Fukushima disaster, the world's worst since Chernobyl in 1986, which highlighted regulatory and operational failings at nuclear utilities. The restart process has been protracted as all of the country's reactors were eventually idled. Between September 2013 and August 2015 Japan had no nuclear plants in operation. Japan's nine regional power utilities and a wholesaler, Japan Atomic Power Co, have 42 nuclear reactors for commercial use, with a total generating capacity of 41.482 gigawatts. The shutdown of the Ikata No.3 reactor will bring the number of the nation's reactors that are online down to four, with a combined capacity of 3.52 gigawatts, or 8.5 percent of the country's total nuclear capacity, according to Reuters calculations. The following table shows the status of Japan's nuclear power plants. Company Plant Unit MW Status Hokkaido Tomari 1 579 Shutdown 22/4/11 Hokkaido Tomari 2 579 Shutdown 26/8/11 Hokkaido Tomari 3 912 Shutdown 5/5/12 Tohoku Onagawa 1 524 Shutdown 11/3/11 Tohoku Onagawa 2 825 Shutdown 6/11/10 Tohoku Onagawa 3 825 Shutdown 11/3/11 Tohoku Higashidori 1 1,100 Shutdown 6/2/11 Tepco Fukushima-Daini 1 1,100 Shutdown 11/3/11 Tepco Fukushima-Daini 2 1,100 Shutdown 11/3/11 Tepco Fukushima-Daini 3 1,100 Shutdown 11/3/11 Tepco Fukushima-Daini 4 1,100 Shutdown 11/3/11 Tepco Kashiwazaki-Kariwa 1 1,100 Shutdown 6/8/11 Tepco Kashiwazaki-Kariwa 2 1,100 Shutdown 16/7/07 Tepco Kashiwazaki-Kariwa 3 1,100 Shutdown 16/7/07 Tepco Kashiwazaki-Kariwa 4 1,100 Shutdown 16/7/07 Tepco Kashiwazaki-Kariwa 5 1,100 Shutdown 25/1/12 Tepco Kashiwazaki-Kariwa 6 1,356 Shutdown 26/3/12 Tepco Kashiwazaki-Kariwa 7 1,356 Shutdown 23/8/11 Chubu Hamaoka 3 1,100 Shutdown 29/11/10 Chubu Hamaoka 4 1,137 Shutdown 13/5/11 Chubu Hamaoka 5 1,380 Shutdown 14/5/11 Hokuriku Shika 1 540 Shutdown 1/3/11 Hokuriku Shika 2 1,206 Shutdown 11/3/11 Kansai Mihama 3 826 Shutdown 14/5/11 Kansai Takahama 1 826 Shutdown 10/1/11 Kansai Takahama 2 826 Shutdown 25/11/11 Kansai Takahama 3 870 Online 6/6/17 Kansai Takahama 4 870 Online 17/5/17 Kansai Ohi 1 1,175 Shutdown 16/7/11 Kansai Ohi 2 1,175 Shutdown 16/12/11 Kansai Ohi 3 1,180 Shutdown 2/9/13 Kansai Ohi 4 1,180 Shutdown 15/9/13 Chugoku Shimane 2 820 Shutdown 27/1/12 Shikoku Ikata 2 566 Shutdown 13/1/12 Shikoku Ikata 3 890 Shutdown 3/10/17 Kyushu Genkai 2 559 Shutdown 29/1/11 Kyushu Genkai 3 1,180 Shutdown 11/12/10 Kyushu Genkai 4 1,180 Shutdown 25/12/11 Kyushu Sendai 1 890 Online 8/12/16 Kyushu Sendai 2 890 Online 23/2/17 Japco Tokai Daini 1 1,100 Shutdown 11/3/11 Japco Tsuruga 2 1,160 Shutdown 7/5/11 (Reporting by Osamu Tsukimori; Editing by Richard Pullin)