As of the end of FY2022
| Project Name | Voltage(kV) | Scale | Start of Operation | |
|---|---|---|---|---|
| Transmission | ||||
| Updating of Goi Thermal Power Plant line | 275 | 11.1km | October 2023 | |
| New installation of Chiba-Inzai line | 275 | No1:10.5km No2:10.5km |
April 2024 | |
| Switch of the connection of Kashima-Kaihin line | 275 | 0.2km → 0.3km | 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 | 1.1km | No1 : Jan 2025 No2 : Apr 2025 |
|
| New installation of MS18GHZ051500 access line (tentative name) | 275 | 0.1km | June 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 Higashishimizu line | 275 | 18.8km (Including 6.4km of existing) |
January 2027 | |
| New installation of Shin-Sodegaura line | 500 | 0.1km | No1 : Mar 2027 No2 : Feb 2028 |
|
| 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 G5100026 transmission line (tentative name) | 500 |
0.7km | December 2028 | |
| New installation of Jyohoku line | 275 | 20.9km | February 2030 | |
| Substation | ||||
| Increase in capacity of transformer (Shin-Keiyo substation) | 275/154 | 450MVA | ||
| Increase in capacity of transformer (Shin-Noda substation) | 275/154 | 80MVA | November 2023 | |
| Discontinuance of transformer (Kita-Tokyo substation) | 275/154 | -300MVA | January 2022 | |
| New construction of Chiba-Inzai substaion | 275/66 | 600MVA | April 2024 | |
| Additional installation of transformer (Kashima subsation) | 275/66 | 300MVA | ||
| 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 |
|
| Discontinuance of transformer (Shin-Fuji substation) | 275/154 | -200MVA | April 2025 | |
| Additional installation of Chiba-Inzai line | 275/66 | 600MVA | 4B : Nov 2025 1B : Feb 2027 |
|
| Increase in capacity of transformer (Kashima subsation) | 275/66 | 200MVA | 7B : Feb 2026 8B : Feb 2027 |
|
| Additional installation of transformer (Shin-Toyosu subsation) | 275/66 | 300MVA | March 2026 | |
| Increase in capacity of transformer (Shin-Tokorozawa substation) | 500/275 | 1,000MVA | 4B : Apr 2026 5B : Jun 2027 |
|
| Additional installation of transformer (Toyooka subsation) | 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 subsation) | 500/154 | 750MVA | February 2027 | |
| Additional installation of transformer (Kita-Sagami subsation) | 275/66 | 600MVA | 4B : Jun 2026 8B : Jun 2027 |
|
| Discontinuance of transformer (Shin-Tokorozawa substation) | 500/275 | -1,000MVA | December 2027 |
(Note)
- Transmission scale: Horizontal distance, Substation scale: increase of output
