Midday power on the exchange sold for 25 paise a unit on Wednesday
Power for the 13:00–13:30 window on 8 July cleared at Rs 249.98 per MWh in the day-ahead auction on the Indian Energy Exchange — 25 paise a unit. At one o'clock, sellers offered 55,431 MWh against purchase bids of just 7,092 MWh. The hour before, the clearing price was Rs 300.59; the hour after, Rs 275.23.
At the other end of the same day, the midnight hour cleared at about Rs 5,000 per MWh — Rs 5 a unit — so the market paid twenty times more for power at midnight than at lunchtime. Across the full day the exchange traded 173,773 MWh at a simple average of Rs 3,290 per MWh and a volume-weighted average of Rs 3,206.
Why it matters
The pattern is the solar mid-day glut in its purest form yet in this monsoon: sell offers swelled past 55,000 MWh through hours 12 to 15 while buy interest fell below 8,100 MWh, and prices collapsed to the mid-day trough before recovering into the evening ramp.
The grid's own frequency log confirms the surplus was physical, not just financial — the system ran above 50.05 Hz for roughly a quarter of the day.
The details
The trough was no single-block accident: every fifteen-minute block from noon to three cleared below Rs 700 per MWh, and sell offers exceeded buy bids in each of them by margins of six to eight times, keeping the auction pinned near its effective floor for three full hours.
Who is affected
Buyers purchasing power during the midday hours benefited from prices as low as 25 paise a unit, a fraction of the midnight rate.
Generators offering into the midday market faced a glut of supply that pinned prices near the effective floor for three straight hours.
What's next
Watch whether this pattern of extreme midday-to-midnight price swings persists as the monsoon progresses and solar output continues to saturate daytime demand.
Continued monitoring of the frequency band excursions will indicate whether the physical surplus behind these prices remains a recurring feature of the grid.
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