As of the end of FY2024
| Project Name | Voltage(kV) | Scale | Start of Operation | |
|---|---|---|---|---|
| Transmission | Switch of the connection of Kashima-Kaihin line | 275 | No4 : 0.2km | No4 : Apr 2025 |
| Switch of the connection of Fukushima trunk line, mountain-side line | 500 | No1 : 1.1km No2 : 1.1km |
No1 : May 2025 No2 : Aug 2025 |
|
| Additional installation of Chiba-Inzai line | 275 | No.3 : 10.5km No.4 : 10.5km |
No3 : Feb 2027 No4 : Nov 2025 |
|
| New installation of Higashishimizu line | 275 | 18.8km (Including 6.4km of existing) |
January 2027 | |
| Additional installation of Kita-Musashino line | 275 | 13.9km | May 2027 | |
| New installation of MS18GHZ051500 access line (tentative name) | 275 | No1 : 0.1km No2 : 0.1km |
No1 : Aug 2027 No2 : Sep 2027 |
|
| Updating of Shinjuku line | 275 | No1：22.1km→21.2km No2：19.9km→21.2km No3：19.8km→21.2km |
No1 : Aug 2030 No2 : Nov 2032 No3 : Dec 2027 |
|
| Updating of Higashi-Shinjuku line | 275 | No2：23.4km→5.0km No3：23.4km→5.3km |
No2 : Nov 2032 No3 : Dec 2027 |
|
| New installation of Shin-Sodegaura line | 500 | No1：0.1km No2：0.1km |
No1 : Nov 2028 No2 : May 2029 |
|
| New installation of G5100026 access line | 500 | 0.5km | December 2028 | |
| New installation of Jyohoku line | 275 | 20.9km | August 2033 | |
| Substation | Additional installation of transformer (Shin-Toyosu substation) | 275/66 | 300MVA | January 2026 |
| Increase in capacity of transformer (Shin-Tokorozawa substation) | 500/275 | 1,000MVA | 4B : Apr 2026 5B : Jun 2027 |
|
| Additional installation of transformer (Chiba-Inzai line) | 275/66 | 600MVA | 4B : May 2026 1B : Feb 2027 |
|
| Additional installation of transformer (Toyooka substation) | 275/154 | 450MVA | June 2026 | |
| Discontinuance of transformer (Shin-Fuji substation) | 275/154 | -200MVA | October 2026 (Discontinuance) | |
| Increase in capacity of transformer (Naka-Tokyo substation) | 275/154 | 200MVA | 1B : Dec 2026 2B : Feb 2027 |
|
| Increase in capacity of transformer (Koto substation) | 275/66 | 150MVA | Janurary 2027 | |
| Additional installation of transformer (Shin-Fuji substation) | 500/154 | 750MVA | February 2027 | |
| Additional installation of transformer (Kita-Sagami substation) | 275/66 | 600MVA | June 2027 | |
| Increase in capacity of transformer (Kita-Tama substation) | 275/66 | 200MVA |
2B : Jun 2027 3B : Jun 2029 |
|
| Increase in capacity of transformer (Minami-tama substation) | 275/66 | 100MVA | June 2027 | |
| Increase in capacity of transformer (Toumou substation) | 275/66 | 150MVA | November 2027 | |
| Increase in capacity of transformer (Boso substation) | 275/154 | 250MVA | December 2027 | |
| Additional installation of transformer (Keihin substation) | 275/154 | 450MVA | March 2028 | |
| Discontinuance of transformer (Shin-Tokorozawa substation) | 500/275 | -1,000MVA |
March 2028 (Discontinuance) |
|
| Additional installation of transformer (Eda substation) | 275/66 | 300MVA | June 2028 | |
| Additional installation of transformer (Shin-Hanno substation) | 500/275 | 1500MVA | March 2029 | |
| Increase in capacity of transformer (Kashima substation) | 275/66 | 200MVA |
7B : May 2029 8B : May 2030 |
(Note)
- Transmission scale: horizontal distance, Substation scale: increase of output
