India's hydropower output plunges as weak monsoon hits dams

India’s monsoon has stalled long before the calendar marks midsummer. The India Meteorological Department (IMD) reported that cumulative rainfall across the country up to 6 July 2026 stood at 170.7 mm, a shortfall of 20 per cent below the long‑period average. By early July the deficit narrowed to 12 per cent as the season’s first heavy showers arrived, but the lag has already left major reservoirs sagging.

Hydropower generation, long a cornerstone of the nation’s renewable mix, has taken the hardest hit. Mid‑June 2026, news outlets noted a “sharpest fall in over two years” in dam output, a plunge tied directly to the delayed monsoon that left water levels too low to drive turbines at full capacity. The drop was most stark in Karnataka, where the Tungabhadra reservoir – a lifeline for paddy cultivation and rice‑mill operations – was described as “nearly empty”. Local officials warned that the scarcity would reverberate beyond agriculture, curbing the state’s ability to meet its power‑generation targets.

Media additions

State‑by‑state strain

Beyond Karnataka, the monsoon shortfall has rippled across the sub‑continent.

In Maharashtra, the IMD’s yellow alert for heavy to extremely heavy rain on 7 July 2026 hinted at a last‑ditch effort to close the gap, while the same day saw Delhi‑NCR under a yellow alert for thunderstorms, underscoring the uneven distribution of showers.

Meanwhile, the Indus basin in Jammu and Kashmir, though reported as “near normal” on 6 July 2026, sits against a national backdrop of declining storage.

Farmers in Karnataka’s Kalaburagi district have watched red gram seedlings wilt as the delayed rains leave fields bone‑dry, while cotton fields in Raichur and Yadgir report similar stress. Six MLAs from the district have pooled financial assistance for affected families, illustrating a growing reliance on ad‑hoc relief as water scarcity tightens.

El Niño’s amplifying role

Scientists warn that the warming of Pacific waters skews global rainfall patterns, driving drought in some regions while intensifying floods elsewhere. In India, the phenomenon is projected to suppress monsoon inflows, deepening the water deficit already evident in rainfall statistics.

Analysts at the Centre for Renewable Energy Analysis (CREA) warned that India’s energy system could face an “18 TWh generation gap” if renewable output stays depressed and air‑conditioning demand spikes. The same analysis warned that the shortfall may “lead to a surge in coal‑fired power and substantial CO₂ emissions”. CREA’s briefing called for an acceleration of solar and battery deployment to shore up grid resilience against such extreme‑weather shocks.

Power‑sector repercussions

Hydropower’s dip has forced the grid operator to lean more heavily on thermal plants. Coal‑fired stations, already under pressure from India’s climate‑change commitments, now stand to fill the void left by turbines that cannot turn without water. The resulting emissions risk undermines national targets for decarbonisation, a point directly raised by the CREA analysis.

Governmental and institutional response

Nationally, the Ministry of Power has directed officials to “strengthen preparedness” in the face of below‑normal monsoon rainfall, a reminder echoed by Andhra Pradesh’s Home Minister Anitha, who urged state agencies to brace for water stress.

In parallel, the World Meteorological Organization, in its ongoing assessment of the El Niño, will issue updates on the expected intensity and duration of the current cycle. The IMD, meanwhile, continues to forecast “heavy to extremely heavy showers” across central and western states throughout the next five days, hoping to lift the rain‑deficit before the end of the month.

What to watch next

• Further updates from the World Meteorological Organization on the El Niño’s strength and longevity.
• IMD’s daily rainfall outlooks, particularly for Karnataka, Gujarat and Maharashtra, where reservoir recovery is most urgent.
• CREA’s follow‑up analysis on coal‑fuelled generation and associated CO₂ emissions as the monsoon shortfall persists.
• State electricity boards’ load‑shedding notices and any emergency procurement of additional coal or imported power.

The confluence of a delayed monsoon, a powerful El Niño and a sharply falling hydropower output places India at a pivotal moment. The next handful of weeks will decide whether emergency water releases, intensified rainfall and rapid renewable‑capacity roll‑out can cushion the gap, or whether the nation will be forced to rely more heavily on carbon‑intensive coal at a time when global climate imperatives demand a swift transition.