Analys
The self-destructive force of unregulated solar power
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Solar and wind power production has increased rapidly over the latest years as LCOE costs have fallen sharply while government support schemes have given it an extra boost as well. Solar and wind power production is totally unregulated supply. They produce whenever they produce. Fossil power supply on the other hand is fully dispatchable to the degree that we tend to take it for granted. As such we have naturally tended to underestimate the consequences of not having dispatchability in solar and wind power.
When you start out with a large, fossil-based power system it is fairly easy to add unregulated power supply from solar and wind because it can piggyback on the dispatchability and flexibility of the fossil power system. But as the share of unregulated renewable energy rises to a larger and larger share of production, the flexibility in the fossil part of the system naturally gets smaller and smaller. This problem is accentuated further by the fact that solar power production has a very high concentration of production where 80% of production in a year is produced in only 20% of the hours in the year. Thus fossil flexibility and dispatchability is eroded much faster during these 20% hours.
Power prices typically collapse to zero or negative when demand is fully met or saturated by unregulated power supply. That again implies that solar power profitability collapse as well. And the result of that of course is that the exponential growth in solar power production which we now take for granted and which we expect will lead us all the way to zero emissions could come to a full stop as well.
This is already a rapidly increasing problem in California where more and more renewable energy is denied access to the grid because there simply isn’t enough demand for it just then or because the grid cannot handle it. But it is also becoming an increasing problem in Germany where the strong growth and high concentration of solar power increasingly is destroying the power prices just when they produce the most.
The need for biiiig, cheeeeap grid batteries are now becoming increasingly critical for the the exponential growth in solar and wind power to continue.
We fear that the self-destructive force on power prices, of exponential growth in unregulated solar power, is some kind of Solar-hara-kiri process with respect to its own profitability. And that it has the potential to develop along a curve of ”first gradually, then suddenly”. And when/if that happens the exponential growth in unregulated solar power production should naturally come to a screeching halt.
The resolution of the problem is of course the eventual arrival of biiiig, cheeeap grid batteries which then again will sett solar power production free to resume its exponential growth.
Feeding solar and wind power supply into a fossil system is easy to start with. Then very difficult. It is easy to build unregulated solar and wind power supply into a flexible fossil system. It is easy to infuse unregulated power supply (Solar and Wind) into a power system where there is lots and lots of fossil based power. Fossil supply can then back-off and make room for solar and wind power whenever the sun is shining or the wind is blowing and then ramp up again when it suddenly disappear. But when unregulated, renewable energy supply keeps growing it becomes harder and harder to infuse yet more of it into the system as the fossil flexibility is increasingly eroded. That’s when yet more supply of solar and wind is no longer pushing aside fossil supply but instead is starting to destroy their own prices.
Solar power produces 80% of its production during 20% of the hours in the year. Solar power has however a much more tightly focused production profile than wind. In Germany in 2023 some 80% of all solar power production was concentrated on only 20% of the hours of the year. For wind power the 80% share of production was spread out over 50% of the hours in the year. The reason is of course that the wind can blow both summer and winter and night and day. Solar power is instead focused during the day and during summer. It has a much higher concentration of production.
Power prices tend to collapse when demand is fully covered by unregulated power supply. When solar power production grows rapidly in a given power system then its high production concentration will eventually lead to full saturation during certain hours of the year. Demand during these hours will then be fully supplied and covered by unregulated power like solar, wind, run-of-river hydro and other unregulated supply. That is great as it means that the fossil share in these hours then are close to zero.
The problem is that power markets, more than any other commodity market in the world, are extremely sensitive to imbalances in supply and demand. A little bit too little supply and the power price can spike up to close to infinity. A little bit too much supply and the price crashes to zero or negative.
When unregulated power supply reaches full demand saturation during certain hours then power prices tend to collapse because it is so easy to get a little bit too much supply.
It is not a problem when power prices collapse for just a few hours per year. But the number of hours affected is growing rapidly many places. The US EIA highlighted in October 2023 (”Solar and wind power curtailments are rising in California”) that this is becoming a bigger and bigger problem in California. Since 2019 the power system operator there has been forced to curtail supply of unregulated power more and more. There simply isn’t enough demand in certain hours to meet the spikes in unregulated supply or the grid isn’t up to the task of distributing the unregulated supply in the system.
So when producers of unregulated supply produces the most they increasingly are denied access to sell it into the grid or if they are allowed to sell it into the grid the price is close to zero or even negative.
US EIA: Solar and wind power curtailments are rising in California
Germany is increasingly affected as booming solar production is depressing prices more and more. This is now also a rapidly increasing problem in Germany where rapid growth in supply of solar and wind power together increasingly are forcing power prices lower just when they produce the most.
Average German power prices for hour 1 to 24 for certain periods and years. Highly concentrated supply of solar power during summer and during the day is increasingly forcing power prices towards zero during these periods
It is like ”Solar hara-kiri” when increasing supply of solar power is killing its own prices and profits. It was not a big problem economically when only a few hours are affected. But as more and more hours are affected it is becoming an increasing problem. It is like ”Solar hara-kiri” where rapidly rising supply of solar power is increasingly killing its own prices. With that it is killing its profits. And if profits are killed than new-build and growth in supply will typically slow down rapidly as well.
This is probably not a big problem globally yet as the global power system is still predominantly fueled by fossil fuels which can back off when renewable energy spikes up. But in certain pockets of the world where penetration of unregulated power supply has reached high levels it is becoming an increasing problem. Like in California and in Germany.
The volume weighted solar power price in September 2023 in Germany had a 38% discount to power prices during non-solar power hours. And the discount looks like it is rapidly getting bigger and bigger.
The monthly average volume weighted solar power price versus the average volume weighted non-solar power price weighted by the inverse profile. In Germany in September 2023 solar power producers only achieved 62% of the average price during hours of the day when the sun wasn’t shining.
First gradually, then suddenly. There is a clear risk here that this progresses along a process of ”first gradually, then suddenly”. This is already what we have seen over the past couple of years: The discount for what solar power earns when it produces power versus what the power price is when it is not producing is increasing rapidly as more and more unregulated power supply hits right into the ”demand ceiling”. The inflicted pain from this process so far has to a large degree been masked by incredibly high natural gas prices. So even if the profitability for solar power has been eroding, the average power price in the system has been much higher than usual due to high natural gas and CO2 prices.
Graphing all the individual hourly data for solar power and power demand in Germany in 2022 we see that solar power alone is not yet reaching full saturation versus demand.
Germany 2022: Hourly German power demand and solar power supply in 2022. A total of 8760 hours for each in consecutive order. Her showing only Demand and Solar power production
The unregulated power supply is increasingly hitting the ”demand ceiling”. If we now add all the other sources of unregulated power supply, predominantly offshore and onshore wind and run of river, then we get the following picture where we see that unregulated German power supply increasingly is hitting right up and into the ”demand ceiling”. In those instances there will be no, flexible fossil power supply left to back off and that is typically when power prices collapse or go negative.
Germany 2022: Hourly German power demand (blue dots) and unregulated supply (solar, wind, run of river,…) in orange dots. A total of 8760 hours for each in consecutive order.
High unregulated power supply saturation vs demand implied lower power prices in 2022. Sorting 8760 individual power prices in Germany from Y2022 from lowest to highest shows that power German power prices were strongly related to the penetration of unregulated power supply. In the following graph, we have sorted the data from the lowest price to the highest price in the year 2022. Prices were ireasingly depressed when unregulated power penetrated up and into the ”demand ceiling”. Natural gas prices were extreme in 2022 and overall power prices were exceptionally high for that reason as well. But the tendency of price destruction in relation to high levels of unregulated power vs demand is clear.
Germany 2022: Hourly German power demand (blue dots) and unregulated supply (solar, wind, run of river,…) in orange dots. A total of 8760 hours. Sorted according to how hourly power prices were from lowest to highest.
The unregulated power supply penetrating vs demand was even deeper in 2023. If we make the same graph for the year 2023 from 1 Jan to 20 Oct, we can see how the unregulated power is penetrating deeper and deeper into the power ”demand ceiling”. As a result the solar power discount vs. non-solar power hours from March to September in 2023 reached an even higher discount in 2023 than in 2022.
2023 year to 20 October: Hourly German power demand (blue dots) and unregulated supply (solar, wind, run of river,…) in orange dots. A total of 8760 hours. Sorted according to how hourly power prices were from lowest to highest. German power demand was down 8.3% YoY in H1-2023 due to the European energy crisis and still very high power prices
Solar power hours and non-solar power hours is not given as a clear cut-off, but a gradual one. In the following graph given as average profiles of the year from hour 1 to hour 24. First calculated explicitly for solar power production and then the inverse is calculated from that one. These solar power profiles can then be calculated for each individual day in the year giving individual inverse-curves on a daily basis.
The daily ”solar power production profiles” and the ”non-solar power production profiles” typically looks like this graph but calculated individually per day as solar power production varies from day to day and through the seasons. The solar power production profile is explicitly given by the actual solar power production that day while the non-solar power profile is derived directly from this and the inverse of it on a daily basis.
The exponential growth in solar and wind power is likely to slow down in the years to come as grid constraints and lack of power cables is holding up growth in renewable energy with waiting times for access of 5-10 years:
”Offshore wind auction’s lack of bids must be ‘wake-up call’ for UK, says RWE chief”
FT: ”Gridlock: how a lack of power lines will delay the age of renewables”
FT: ”Will there be enough cables for the clean energy transition?”
Market is starting to take US/Iran headlines with a pinch of salt. Brent crude rose $2.8/b yesterday to an official close of $112.1/b. But after that it traded as low as $108.05/b before ending late night at around $109.7/b. Through the day it traded in a range of $106.87 – 112.72/b amid a flurry of news or rumors from Iran and the US. ”US temporary sanctions during negotiations” (falls alarm). ”We will bomb Iran” (not anyhow),… etc. While the market is still fluctuating to this kind of news flow, it is starting to take such headlines with a pinch of salt.
We’ll see. Maybe, maybe not. The Brent M1 contract is trading at $110.2/b this morning which very close to the average ticks through yesterday of $110.4/b.
Trump with bearish, verbal intervention whenever Brent trades above $110/b it seems. What seems to be a pattern is that Trump states something like ”very good negotiations going on with Iran”, ”New leaders in Iran are great,..”, ”Great progress in negotiations,…”, ”Deal in sight,..” etc whenever the Brent M1 contract trades above $110/b. An effort to cool the market. These hot air verbal interventions from Trump used to have a heavy bearish impact on prices, but they now seems to have less and less effect unless they are backed by reality.
As far as we can see there has been no real progress in the negotiations between the US and Iran with both sides still standing by their previous demands.
Iran is getting stronger while the cease fire lasts making a return to war for Trump yet harder. Iran is naturally in constant preparation for a return to war given Trump’s steady threats of bombing Iran again. Iran is naturally doing what ever is possible to prepare for a return to war. And every day the cease fire lasts it is better prepared. This naturally makes it more and more difficult and dangerous for the US to return to warring activity versus Iran as the consequences for energy infrastructure in the Persian Gulf will be more and more severe the longer the cease fire lasts. Israel seems to see it this way as well. That the war is not won and that current frozen state of a cease fire gives Iran opportunity to rebuild military and politically.
Global inventories are drawing down day by day. How much? In the meantime the Strait of Hormuz stays closed. There is varying measures and estimates of how much global inventories are drawing down. Our rough estimate, back of the envelope, is that global inventories are drawing down by at least some 10 mb/d or about 300 mb/d in a balance between loss of supply versus demand destruction. Other estimates we see are a monthly draw of 250-270 mb/d. The IEA only ’measured’ a draw in global observable stocks of 117 mb in April with oil on water rising 53 mb while on shore stocks fell 170 mb. But global stocks are hard to measure with large invisible, unmeasured stocks. As such a back of the envelope approach may be better.
Oil products is what the world is consuming. Oil product prices likely to rise while product stocks fall. Strategic Petroleum Reserves (SPR) are predominantly crude oil. Discharging oil from OECD SPR stocks, a sharp reduction in Chinese crude imports and a reduction in global refinery throughput of 6-7 mb/d has helped to keep crude oil markets satisfactorily supplied. But global inventories are drawing down none the less. And oil products is really what the world is consuming. So if global refinery throughput stays subdued, then demand will eventually have to match the supply of oil products. The likely path forward this summer is a steady draw down in jet fuel, diesel and gasoline. Higher prices for these. Then, if possible, higher refinery throughput and higher usage of crude in response to very profitable refinery margins. And lastly sharper draw in crude stocks and higher prices for these. But some 6 mb/d of oil products used to be exported through the Strait of Hormuz. And it may not be so easy to ramp up refinery activity across the world to compensate. Especially as Ukraine continues to damage Russian refineries as well as Russian crude production and export facilities.
Watch oil product stocks and prices as well as Brent calendar 2027. What to watch for this summer is thus oil product inventories falling and oil product premiums to crude rising. Another measure to watch is the Brent crude 2027 contract as it rises steadily day by day as the Strait of Hormuz stays closed and global oil inventories decline. The latter is close to the highest level since the start of the war and keeps rising.
The Brent M1 contract and the Brent 2027 prices and current price of jet fuel in Europe (ARA). All in USD/b
Our back of the envelope calculation of the global shortage created by the closure of the Strait of Hormuz. Note that 3.5 mb/d of discharge from SPR is also a draw. Note also that ’Forced demand loss’ of 2.5 mb/d is probably temporary and will fall back towards zero as logistics are sorted out leaving ’Price demand loss’ to do the job of balancing the market. Thus a shortfall of at least 9 mb/d created by the closure. More if SPR discharge is included and more if Forced demand loss recedes.
Brent is climbing higher. Front-month is at USD 106.3/bl this morning, close to a weekly high and a USD 9/bl jump from Mondays open. This is the move we flagged as a risk earlier in the week: the market shifting from ”a deal is around the corner” to ”this is going to take longer than we thought”.
Analyst Commodities, SEB
During April, rest-of-year Brent remained remarkably stable around USD 90/bl. A stability which rested on one single assumption: the SoH reopens around 1 May. That assumption is now slowly falling apart.
As we highlighted yesterday: every week of delay beyond 1 May adds (theoretically) ish USD 5/bl to the rest-of-year average, as global inventories draw 100 million barrels per week. i.e., a mid-May reopening implies rest-of-year Brent closer to USD 100/bl, and anything pushing into June or July takes us meaningfully higher.
What’s changed in the last 48 hours:
#1: The US military has formally warned that clearing suspected sea mines from SoH could take up to six months. That is a completely different timescale from what the financial market is pricing. Even a political deal tomorrow does not immediately reopen the strait.
#2: Trump has shifted his tone from urgency to ”strategic patience”. In yesterday’s press conference: ”Don’t rush me… I want a great deal.” The market is reading this as a president no longer feeling pressured by timelines, with the naval blockade running in the background.
#3: So far, the military activity is escalating, not de-escalating. Axios reports Iran is laying more mines in SoH. The US 3rd carrier strike group (USS George H.W. Bush) is arriving with two countermine vessels. Trump yesterday ordered the US Navy to destroy any Iranian boats caught laying mines. While CNN reports that the Pentagon is actively drawing up plans to strike Iranian SoH capabilities and individual Iranian military leaders if the ceasefire collapses. i.e., NOT a attitude consistent with an imminent deal!
Spot crude and product prices eased off the early-April highs on a combination of system rerouting and deal optimism. Both now weakening. Goldman estimates April Gulf output is reduced by 14.5 mbl/d, or 57% of pre-war supply, a number that keeps getting worse the longer this drags on.
Demand-side adaptation is ongoing: S. Korea has cut its Middle East crude dependence from 69% to 56% by pulling more from the Americas and Africa, and Japan is kicking off a second round of SPR releases from 1 May. But SPRs are finite.
Ref. to the negotiations, we should not bet on speed. The current Iranian leadership is dominated by genuine hardliners willing to absorb economic pain and run the clock to extract concessions. That is not a setup for a rapid resolution. US/Israeli media briefings keep framing the delay as ”internal Iranian divisions”, the reality is more complicated and points toward weeks and months, not days.
Our point is that the complexity is large, and higher prices have only just started (given a scenario where the negotiations drag out in time). The market spent April leaning on the USD 90/bl rest-of-year assumption; that case is diminishing by the hour. If ”early May reopening” is replaced by ”June, July or later” over the next week or two, both crude and products have meaningful room to reprice higher from here. There is a high risk being short energy and betting on any immediate political resolution(!).
Down on Friday. Up on Monday. The Brent June crude oil contract traded down 5.1% last week to a close of $90.38/b. It reached a high of $103.87/b last Monday and a low of $86.09/b on Friday as Iran announced that the Strait of Hormuz was fully open for transit. That quickly changed over the weekend as the US upheld its blockade of Iranian oil exports while Iran naturally responded by closing the SoH again. The US blew a hole in the engine room of the Iranian ship TOUSKA and took custody of the ship on Sunday. Brent crude is up 5.6% this morning to $95.4/b.
The cease-fire is expiring tomorrow. The US has said it will send a delegation for a second round of negotiations in Islamabad in Pakistan. But Iran has for now rejected a second round of talks as it views US demands as unrealistic and excessive while the US is also blocking the Strait of Hormuz.
While Brent is up 5% this morning, the financial market is still very optimistic that progress will be made. That talks will continue and that the SoH will fully open by the start of May which is consistent with a rest-of-year average Brent crude oil price of around $90/b with the market now trading that balance at around $88/b.
Financial optimism vs. physical deterioration. We have a divergence where the financial market is trading negotiations, improvements and resolution while at the same time the physical market is deteriorating day by day. Physical oil flows remain constrained by disrupted flows, longer voyage times and elevated freight and insurance costs.
Financial markets are betting that a US/Iranian resolution will save us in time from violent shortages down the road. But every day that the SoH remains closed is bringing us closer to a potentially very painful point of shortages and much higher prices.
The US blockade is also a weapon of leverage against its European and Asian allies. When Iran closed the SoH it held the world economy as a hostage against the US. The US blockade of the SoH is of course blocking Iranian oil exports. But it is also an action of disruption directed towards Europe and Asia. The US has called for the rest of the world to engaged in the war with Iran: ”If you want oil from the Persian Gulf, then go and get it”. A risk is that the US plays brinkmanship with the global oil market directed towards its European and Asian allies and maybe even towards China to force them to engage and take part. Maybe unthinkable. But unthinkable has become the norm with Trump in the White House.
Oil product price pain is set to rise as the Strait of Hormuz stays closed into summer
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