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Hedging the Solar Ramp

Why Market Participants Hedge the Morning Ramp and the Evening Peak

Power MarketsSolarHedgingElectronX Market Education · September 2026

The daily shape of electricity supply has changed more in the past ten years than in the previous fifty. As utility-scale and rooftop solar have scaled across the United States, the middle of the day has filled with cheap, abundant power, while the value and the risk in the market have migrated to the hours on either side of the solar day. For anyone who buys, sells, or finances power, two windows now concentrate most of that risk: the morning ramp, roughly the hours ending 07 through 09, and the evening peak, roughly the hours ending 18 through 22. This paper explains what happens in each window, why it matters, and why participants increasingly hedge these specific hours rather than the day as a whole.

The power day has changed shape

The concept that ties everything together is net load, which is total electricity demand minus the generation that comes from wind and solar. Net load is what the rest of the fleet, the gas plants, hydro, imports, and batteries, actually has to serve. Solar does not change how much electricity people use, but it dramatically changes when the conventional fleet is called on to produce it.

In California, this reshaping produced the well known duck curve, and the duck has since deepened into what operators now call a canyon. In April 2025, CAISO solar output peaked around 21 gigawatts and supplied roughly a third of the fuel mix, and average net load between 10 a.m. and 3 p.m. actually turned negative. The system now swings well over 24 gigawatts in about eight hours as it moves from the midday solar trough up to the evening peak. Texas is on the same path at a faster pace. ERCOT utility-scale solar averaged around 24 gigawatts at midday in the summer of 2025, and the grid's net demand peak has drifted from roughly 5 p.m. a few years ago to as late as 8 to 9 p.m. today.

Other regions are following the same curve with a lag. The Southwest, the Southeast, and parts of the Midwest are all adding solar quickly enough that their operators are beginning to see the same midday softness and the same steep ramps into the evening. The pattern described here is not unique to two markets; it is the direction of travel for the grid as a whole. The practical result is the same everywhere: prices in the solar hours are pushed down, and the financial action moves to the ramps.

Morning ramp hedging (HE07 to HE09)

The morning ramp is the window in which the system wakes up. Overnight demand is low, and just before sunrise solar is still producing little to nothing. As households and businesses come online, load climbs quickly, and for a short period demand can rise faster than solar can replace the overnight generation. Net load ramps sharply upward, and the conventional fleet has to move a large amount of capacity in a short time. Across the major markets, the size of these net load ramps has grown substantially, rising by roughly a quarter in CAISO and more than a third in ERCOT over recent years as solar has scaled.

This produces a characteristic pattern of short, sharp price movements in the early morning hours. The spikes are usually briefer than those in the evening, but they can be severe, and they are most pronounced in winter and during cold snaps, when heating load surges before the sun is high enough to help. In many winter-peaking situations, the morning hours, not the afternoon, set the highest price of the day.

Several participants carry real exposure here. Retailers and load serving entities are obligated to serve rising residential and commercial demand at whatever the market clears, so an unhedged morning ramp is a direct margin risk. Gas peakers and storage operators face the mirror image, needing to decide overnight how much to commit and, in the case of batteries, whether to hold charge for the morning or save it for the evening. Solar generators, notably, cannot help themselves in this window, because their panels are barely producing at sunrise, so they have no natural output to offset a morning obligation.

Hedging the morning ramp means locking in a price for these specific hours ahead of time. A retailer that buys the HE07 to HE09 block forward converts an uncertain, spike-prone cost into a known one, protecting margin regardless of how steep the ramp turns out to be. The point is to remove the tail risk of the morning move rather than to bet on it.

Evening peak hedging (HE18 to HE22)

The evening peak is now the single most important window on the grid, and it is where the case for hedging is strongest. As the sun sets, solar output falls from its midday high to zero over the course of a few hours. Demand, however, does not fall with it. In summer, air conditioning runs into the evening, and residential load rises as people return home, so the grid faces its steepest ramp of the day precisely as its largest and cheapest source of supply disappears. In ERCOT and increasingly elsewhere, this has pushed the daily net load peak into the 8 to 9 p.m. range, well after the old late-afternoon peak.

Batteries have stepped into this gap, and they help, but they do not remove the risk. In the summer of 2025 ERCOT batteries were discharging on the order of 4 gigawatts into the 8 p.m. hour. That is meaningful, yet most storage on the system today is limited to a few hours of duration, so it can shave the top of the ramp without covering the full breadth of the evening. The result is that the largest and most frequent price spikes and scarcity events now occur in this window. When the system is tight, it is tight in the evening.

The exposure in these hours is broad. Retailers and load serving entities face their highest-cost obligations here. Industrial and commercial buyers with evening operations are exposed to the same spikes. And solar generators face a particular bind that deserves emphasis: their revenue has migrated to hours when they cannot produce. A solar plant sells its energy into depressed midday prices, then produces nothing during the evening peak when prices are at their highest. Any generator that has sold a shaped or round-the-clock product, or that has committed to a power purchase agreement with an evening delivery profile, is effectively short power in exactly the hours it cannot cover from its own panels.

Hedging the evening peak addresses this directly. A load serving entity buys the HE18 to HE22 block to cap its exposure to the evening spikes that now define its cost. A solar generator or a portfolio manager pairs solar output with a purchased evening block, or with storage, to meet a shaped obligation that the solar asset alone cannot. In both cases the hedge is aimed at the hours where the price risk actually lives, not spread thinly across a flat day.

The two windows at a glance

The morning ramp and the evening peak are driven by the same underlying force, the mismatch between when the sun shines and when people use power, but they present different risks to different participants.

Morning Ramp (HE07 to HE09)Evening Peak (HE18 to HE22)
What drives itDemand wakes up faster than solar comes online; overnight lows give way to morning heating and commercial load.The sun sets while demand is still high; solar output collapses into the highest-load hours of the day.
Net load shapeA steep upward ramp before midday solar floods the system.The steepest ramp on the grid and, increasingly, the daily net load peak.
Price behaviorShort, sharp morning spikes, most pronounced in winter and cold snaps.The largest and most frequent price spikes and scarcity events on the system.
Most exposedRetailers and load serving entities, gas peakers, storage deciding when to charge.Retailers with evening residential load, solar owners with shaped obligations, anyone short power at dusk.
Why solar cannot self-coverPanels produce little at sunrise.Panels produce nothing after sunset, exactly when prices are highest.

Why hour-specific hedges matter

A natural question is why a participant would not simply hedge with a traditional flat block, a single price for every hour of the day or the month. The answer is that a flat hedge no longer matches the risk. When cheap solar hours and expensive ramp hours are averaged together, the blended price hides the very exposure that matters. A retailer hedged on a flat block is over-covered in the middle of the day, when prices are low anyway, and under-covered in the morning and evening, when prices spike. This mismatch between the shape of a participant's real position and the shape of a blunt hedge is what the industry calls shape risk, and solar has made it larger every year. The gap between how much net load ramps and how much gross load ramps has widened to the point where, in recent years, the median hourly net load ramp exceeded the load ramp by roughly half in ERCOT and by nearly ninety percent in CAISO.

Granular, hour-specific products let participants hedge the ramps on their own terms. A retailer can buy the morning and evening blocks that carry its risk and leave the cheap midday hours unhedged. A solar developer can build a hedge that mirrors the actual delivery shape of its offtake agreement. A storage operator can express a view on the spread between the midday trough and the evening peak, which is the spread its asset is built to capture. Precision of this kind is not a luxury as solar penetration rises; it is the difference between a hedge that protects margin and one that quietly leaves the real risk uncovered.

Conclusion

Solar has not made the power market less risky; it has relocated the risk. The middle of the day is cheap and calm, and the morning ramp and the evening peak now hold most of the volatility, most of the scarcity, and most of the money. The morning ramp, in the hours ending 07 through 09, is a short and sharp exposure that falls hardest on those serving rising demand before the sun is up. The evening peak, in the hours ending 18 through 22, is the deepest exposure on the grid and the one that catches solar owners in the bind of producing nothing when prices are highest. Participants hedge these specific windows because that is where their real risk sits, and because the tools to hedge them precisely, hour by hour, now exist. As solar continues to grow across every region, the ability to manage these two windows will only become more central to running a sound power book.

References

Disclaimer

This material is provided by ElectronX for educational purposes only. It is a general overview of power market structure and does not constitute trading, investment, legal, or tax advice.