As of the end of FY2023
| Project Name | Voltage(kV) | Scale | Start of Operation | |
|---|---|---|---|---|
| Transmission | ||||
| New installation of Chiba-Inzai line | 275 | No1:10.5km No2:10.5km |
May 2024 | |
| Switch of the connection of Kashima-Kaihin line | 275 | No1:0.2km No2:0.2km |
No1 : Apr 2025 No2 : Nov 2024 |
|
| Discontinuance of No1, 2 of Kashima Thermal Power Plant line | 275 | 5.0km | December 2024 | |
| Switch of the connection of Fukushima trunk line, mountain-side line | 500 | No1:1.1km No2:1.1km |
No1 : May 2025 No2 : Aug 2025 |
|
| New installation of Chiba-Inzai line | 275 | No.3:10.5km No.4:10.5km |
No3 : Feb 2027 No4 : Nov 2025 |
|
| New installation of MS18GHZ051500 access line (tentative name) | 275 | 0.1km | June 2026 | |
| New installation of Higashishimizu line | 275 | 18.8km (Including 6.4km of existing) |
January 2027 | |
| New installation of Kita-Musashino line | 275 | 13.9km | May 2027 | |
| Updating of Higashi-Shinjuku line | 275 | No2：23.4km→5.0km No3：23.4km→5.3km |
No2 : Nov 2032 No3 : Dec 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 |
|
| 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 (tentative name) | 500 |
0.5km | December 2028 | |
| New installation of Jyohoku line | 275 | 20.9km | February 2030 | |
| Substation | ||||
| New construction of Chiba-Inzai substation | 275/66 | 600MVA | June 2024 | |
| Additional installation of transformer (Kashima substation) | 275/66 | 300MVA | 9B：June 2024 | |
| Discontinuance of transformer (Ageo substation) | 275/66 | -300MVA | June 2024 | |
| Increase in capacity of transformer (Naka-Tokyo substation) | 275/154 | 200MVA | 1B : Jan 2025 2B : Jun 2025 |
|
| Additional installation of transformer (Chiba-Inzai line) | 275/66 | 600MVA | 4B : Nov 2025 1B : Feb 2027 |
|
| Additional installation of transformer (Shin-Toyosu substation) | 275/66 | 300MVA | January 2026 | |
| Discontinuance of transformer (Shin-Fuji substation) | 275/154 | -200MVA | October 2026 | |
| Increase in capacity of transformer (Kashima substation) | 275/66 | 200MVA | 7B : Feb 2026 8B : Feb 2027 |
|
| Increase in capacity of transformer (Shin-Tokorozawa substation) | 500/275 | 1,000MVA | 4B : Apr 2026 5B : Jun 2027 |
|
| Additional installation of transformer (Toyooka substation) | 275/154 | 450MVA | June 2026 | |
| Increase in capacity of transformer (Koto substation) | 275/66 | 150MVA | June 2026 | |
| Increase in capacity of transformer (Kita-Tama substation) | 275/66 | 200MVA | 2B : Jun 2026 3B : Jun 2027 |
|
| Additional installation of transformer (Shin-Fuji substation) | 500/154 | 750MVA | February 2027 | |
| Additional installation of transformer (Kita-Sagami substation) | 275/66 | 600MVA | 4B：June 2027 5B：June 2027 |
|
| Increase in capacity of transformer (Boso substation) | 275/154 | 250MVA | November 2027 | |
| Discontinuance of transformer (Shin-Tokorozawa substation) | 500/275 | -1,000MVA | December 2027 | |
| Additional installation of transformer (Keihin substation) | 275/154 | 450MVA | March 2028 | |
| Additional installation of transformer (Shin-Hanno substation) | 500/275 | 1500MVA | March 2029 |
(Note)
- Transmission scale: Horizontal distance, Substation scale: increase of output
