I'm data driven as well. That's precisely
why I'm projecting solar costs to fall by at least another order of magnitude. We aren't even close to the floor. I'm working on another megapost breaking down my thesis for why I'm expecting Wright's Law for solar to continue for long enough for the renewables revolution to play out in the next 20 years. It might take 2-3 weeks to complete so I hope this will suffice for now.
Upon review I think the 8% cost decline rate for 2016-2021 shown in the Lazard graph presented in the
post by
@ZachF is correct, as shown below.
(100% - 8%)^(5 years) —> 2021 price is 66% of 2016 price
The chart shows 2016 price of ~$55/MWh, and 2021 price of ~$35/MWh.
35/55 = 64%, close enough to 66% to be within rounding error.
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That being said, 8% is substantially less than the 23% annual cost decline from 2009 through 2016.
However...the '09-'16 era cost declines were
majorly boosted by:
- Improvements in credit access lowering cost of capital as Great Financial Crisis was resolved
- Solar economics are dominated by upfront investment expenses, so the levelized long-term cost per MWh is exquisitely sensitive to capital costs
- Resolution of short-term raw material price spikes circa 2009
- Especially crucial, the prices for oil and polycrystalline silicon wafers spiked BIG TIME in '08
- China's CCP really stepped up government support for scaling panel manufacturing
These macroeconomic factors vary from year to year and thereby create noise that muddies the underlying cost trend. Currently, they are responsible for slowing down the cost trend in '20-'22. The prices of key raw materials like oil, silicon wafers, steel and copper have spiked again, and capital costs are higher now than they were in '20. Shipping costs from China, where the majority of panels are manufactured, have also exploded. The price of qualified labor has also risen because of construction demand in general has skyrocketed.
In this recent macro environment, the fact that solar prices have fallen at all instead of increasing is actually a testament to how reliable the solar improvement trend is. This has been a stress test for the solar industry.
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Source
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Oil Prices
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Always with us, but still shrinking on a per-MWh basis, as this chart in the OP showed. Soft costs in 2015 were roughly equal to the total cost in 2020. Same for 2010 to 2015. It seems to stay at about half the total cost over time.
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