Hetauda–Dhalkebar–Inaruwa 400 kV Backbone
Nepal's first domestic 400 kV backbone is operational east of Dhalkebar; on Hetauda–Dhalkebar the construction dispute is resolved and charging was announced as imminent in October 2026, but energisation is not yet verified.
- Page status
- Verified core
- Updated
- 2026-11-04
- Last reviewed
- 2026-11-04
- Review due
- 2026-12-04
Summary
Nepal's first major domestic 400 kV backbone, represented as two segments with different delivery states. Dhalkebar–Inaruwa is operational; Hetauda–Dhalkebar remains under construction. Describing the entire corridor simply as "operational" would overstate the current east–west transfer path to the Dhalkebar–Muzaffarpur 400 kV Cross-Border Interconnection gateway.
Key Facts
| Parameter | Value |
|---|---|
| Voltage | 400 kV |
| Status | Partially operational: Dhalkebar-Inaruwa operational; Hetauda-Dhalkebar still under construction |
| Total spine length | ~288 km route basis |
| Owner | Nepal Electricity Authority (NEA) (Nepal Electricity Authority) |
| Key substations | Hetauda · Dhalkebar · Inaruwa |
| Segment status | Hetauda-Dhalkebar: under construction · Dhalkebar-Inaruwa: operational since June 2024 |
| Financing | ADB, KfW, World Bank (segment-wise) |
| Pane of operation | Central / Eastern Terai belt |
| Corridor ID | hddi_400 |
Current Status
Evidence checked through 4 November 2026: partially operational. NEA's FY 2025/26 annual report says the decade-long construction dispute "has finally been resolved" and that work resumed, with completion expected "in few months" (NEA Annual Report FY 2025/26, PDF pp.13–14). On 7 October 2026, NEA's executive director said 14 of the 16 towers on the outstanding stretch were built, with two multi-circuit towers in their final stage, and that the line would be charged in about 15 days; transfer between Hetauda and Dhalkebar was limited to about 300 MW, against about 2,000 MW once complete (Spotlight Nepal, 7 Oct 2026). No energisation notice had been located by 4 November 2026. The
corridor's status is stored by segment in data/corridor_specs.csv,
while the map uses document-bounded corridor geometry rather than a
tower-by-tower engineering alignment.
| Segment | Status | Status date/basis | Principal dependency |
|---|---|---|---|
| Hetauda–Dhalkebar | Under construction; charging announced as imminent but not verified | NEA FY 2025/26 report; NEA executive director, 7 Oct 2026 | Two remaining multi-circuit towers and energisation |
| Dhalkebar–Inaruwa | Operating | June 2024 / NEA FY 2024/25 reporting | Completion of the western segment for a continuous backbone |
Recent Updates
| Date | Update |
|---|---|
| FY 2024/25 | NEA reporting distinguishes the operating eastern section from the unfinished Hetauda–Dhalkebar section |
| 3–5 Jul 2026 | NEA operational notices document local shutdowns for conductor-stringing work on the Hetauda–Dhalkebar section |
| 19 Jul 2026 | Public NEA surfaces rechecked; construction activity is established, but completion and energisation remain unverified |
| 18 Aug 2026 | NEA FY 2025/26 annual report: dispute resolved, works resumed, completion expected within months |
| 7 Oct 2026 | NEA executive director: 14 of 16 towers on the outstanding stretch built; charging expected in about 15 days (Spotlight Nepal, 7 Oct 2026) |
| 4 Nov 2026 | No energisation or commissioning notice located; status remains under construction |
Active Blockers
| Blocker | Prevents | Evidence basis |
|---|---|---|
| Remaining Hetauda–Dhalkebar works and right-of-way resolution | Continuous 400 kV operation across the full backbone | World Bank NIETTP Hetauda–Dhalkebar–Inaruwa Resettlement Action Plan and NEA Hetauda–Dhalkebar Construction Notices, July 2026 |
Map Interpretation
In the connected transmission layer, HDDI is represented as two World Bank RAP-controlled corridor features: Hetauda-Dhalkebar and Dhalkebar-Inaruwa. The RPGCL overview fragments remain available in the raw audit/source layer, but they no longer drive the public connected network because they made the corridor read too straight and materially short.
Public decision: default-visible, caveated.
The current validation result has 0 inferred connectors, 0 remaining gaps, and a -1.22% length delta against the current 288 route-km basis. The geometry is still a document-grounded corridor trace, not a tower-by-tower alignment.
Significance
- First 400 kV domestic backbone. The operational Dhalkebar-Inaruwa section and the partly complete Hetauda-Dhalkebar section are the core east-west transfer path behind Nepal's export-readiness story.
- Aggregation point for IPP clusters. Evacuates the Khimti–Dhalkebar 220 kV Hydropower Corridor, Sunkoshi, Tamakoshi and (once online) Arun 3 blocks toward India.
- Decouples load centres. Before HDDI, the Kathmandu Valley and the eastern Terai were weakly linked; HDDI re-wrote the grid topology.
- Mixed construction and operating state. Dhalkebar-Inaruwa is operational, while Hetauda-Dhalkebar remains in the build queue. Treating the whole backbone as operational would overstate current transfer readiness.
Limitations & Controversies
- Concentrated transfer dependency. Until parallel 400 kV paths are commissioned, outages or unfinished sections constrain domestic transfer and export routing. See Transmission and Delivery Are Material Immediate Monetization Constraints.
- Thermal margin tightens as generation grows. NEA has flagged loading rates approaching design limits during the 2024 monsoon peak; MCA Central 400 kV Corridor (Lapsiphedi–Ratmate–Hetauda–Damauli–Butwal) cannot arrive soon enough.
- N-1 reliability not fully certified. Sub-station-level redundancy at Dhalkebar is the subject of ongoing reinforcement projects.
- Map precision caveat. The public trace is now source-bounded and length consistent, but it is still not a tower-level engineering alignment. A future pass should replace it only if NEA or a lender publishes alignment sheets or tower coordinates.
- Current milestone caveat. NEA's FY 2024/25 report provides a July 2025 construction snapshot. July 2026 outage notices confirm later stringing work, but neither source establishes a current remaining-tower count or commissioning.
See also
- MCA Central 400 kV Corridor (Lapsiphedi–Ratmate–Hetauda–Damauli–Butwal) — the parallel 400 kV spine
- Dhalkebar–Muzaffarpur 400 kV Cross-Border Interconnection — the border link HDDI feeds
- Inaruwa–Purnea 400 kV Cross-Border Interconnection — future secondary export route off HDDI
- Transmission and Delivery Are Material Immediate Monetization Constraints
- Nepal Transmission System — 400 kV Landscape & Cross-Border Plan (2025)