Will Nepal’s lights stay on at 7pm in the winter?

Dependable electricity at 7pm in January means Nepal can meet its highest evening demand with power it can actually deliver. The test assumes winter river flows are low, one important transmission corridor may be unavailable, and India provides no evening imports. Installed capacity alone does not prove this reliability.

The article sets a practical stress case: demand reaches about 2,300 MW, winter domestic output falls to roughly 1,218 MW, and a corridor failure could disconnect several plants together. At that moment, transmission lines and substations determine whether available generation reaches users. A plant can still exist but remain unusable if its shared route is damaged.

Nepal plans to import up to 1,154 MW, but India’s current approval covers 654 MW only until 6pm. India has not approved evening-peak imports. Publishing winter stress tests, adding routes, developing storage, and shifting EV charging could show whether the lights can stay on.

Nepal’s expected winter peak is about 2,300 MW, while the Nepal Electricity Authority expects domestic winter output of only around 1,218 MW. That creates a shortfall of more than 1,100 MW. The gap matters most in the evening, when households, factories, and returning EV owners use electricity at the same time.

The NEA plans to import 1,154 MW from India. That amount is almost half of the expected winter peak and broadly matches the stated deficit. However, the plan depends on approval rather than Nepal’s own dependable supply. India currently permits 654 MW from midnight to 6pm, through December 31.

The timing creates the main risk. India has not allowed imports during Nepal’s evening peak, and January’s quantity will be reviewed in December. If imports remain closed at 7pm, Nepal must use domestic storage, alternative generation, batteries, demand management, and stronger transmission routes to cover the gap.

Nepal lost so much generation because many hydropower plants depend on the same narrow valleys, transmission lines, and substations. This concentration creates a common failure point. A flood or landslide does not need to destroy every power plant. Damaging the route that connects them can disconnect all of them from the grid.

The Bhotekoshi flood cut off 432.1 MW along the Trishuli corridor. Later, landslides damaged pylons on the 220kV Kaligandaki corridor and forced 12 plants producing 358.2 MW to shut down. In Rasuwa, flooding affected four operating plants totaling 231 MW. It also destroyed the Trishuli-3B hub substation, stopping generation at plants the water did not directly hit.

This shows why installed megawatts can overstate dependable supply. Nepal needs generation spread across safer locations, flood-risk screening for entire river basins, and a second route for each corridor serving Kathmandu Valley. Otherwise, the next disaster can repeat the same large-scale loss.

Run-of-river hydropower uses the water flowing through a river to generate electricity, with limited ability to store water for later. Its output follows the river’s flow. This makes it productive during Nepal’s wet months but less powerful during the dry winter, precisely when electricity demand can remain high.

The article says more than 70 percent of Nepal’s system runs on river flow. As winter arrives, the NEA expects total output of only about 1,218 MW. Storage plants work differently because they can hold water and release it when demand peaks. Kulekhani’s 106 MW cascade is traditionally kept for dry months and evening needs.

After the flood, however, Kulekhani’s three plants ran around the clock. That increased immediate supply but consumed reserves needed later in winter. Nepal’s project queue includes seven storage schemes totaling about 5,170 MW. Moving those projects forward would make supply more dependable during dry evenings.

If EV owners plug in when they return home, they add a large new load to Nepal’s evening peak. That raises demand at the same time river-based generation is weaker and India may not permit imports. EVs reduce fuel imports, but unmanaged charging can increase pressure on an already fragile electricity system.

The article reports 63,280 registered electric vehicles by the end of fiscal year 2025-26. It also says more than seven in ten private cars Nepal imports are now electric. A driver charging at home after work draws power when households and factories are already using electricity. The combined effect makes the 7pm reliability test harder.

Nepal can reduce this pressure by charging vehicles at different times of day. Daytime solar on factory roofs and spare substation land could help supply charging. Batteries at substations in Kathmandu Valley could also meet part of evening demand, while saved Kulekhani water could be released later.

If a major corridor fails or India closes the evening import window, Nepal needs several forms of backup. Storage can release water when demand peaks. Solar can produce daytime electricity and allow Kulekhani to save water for evening use. Batteries, demand shifting, and interruptible factory contracts can reduce the amount of power needed at the hardest hour.

The article proposes solar panels on factory roofs and spare land at Tarai substations, where power is close to users and away from Himalayan flood zones. Batteries at substations in Kathmandu Valley could cover part of evening demand. Charging homes at different times would shift EV use away from the peak. The NEA could also offer factories discounted interruptible contracts before winter.

Longer-term protection requires more storage projects and less concentration in vulnerable valleys. The article identifies seven queued storage schemes totaling about 5,170 MW. Each corridor serving Kathmandu Valley also needs a second route, so one damaged line cannot isolate so much supply.

An electricity grid links generators to homes and factories. Power plants produce electricity, transmission lines carry it over long distances, and substations connect, switch, and route it toward local users. The system works only when these parts operate together. Generation that cannot travel through the grid cannot serve demand.

The Trishuli corridor demonstrates the mechanism. The Bhotekoshi flood cut off 432.1 MW along that route. The flood also destroyed the 220 kV Trishuli-3B hub substation. Plants that were not directly hit by water still stopped generating because their shared connection to the grid was gone. Similarly, landslides damaged pylons on the Kaligandaki corridor and shut down 12 plants.

This is why Nepal’s reliability cannot be measured only by installed megawatts. The country needs stronger substations, separate transmission routes, and flood-risk screening across river basins. A second route to Kathmandu Valley would keep power moving if one corridor fails.