Week 06 — Solar Helps, Until Wind and Sun Fail Together

Wind and solar through a winter anticyclone, tested hour by hour rather than on annual averages.

Week 06 · complementarity · 31 August 2026

Wind and solar complement each other on average, and reliability is decided by the hours when the complement fails.

Property

complementarity

Stance

Challenges it

How

A winter anticyclone — calm, cold, and overcast at noon.

Studio activity

Run wind-only, solar-only and mixed portfolios through the event. Does the mix remove the failure, shorten it, or move it?

Wind and solar are genuinely anti-correlated across a year. The phrase that matters in this course is “across a year”.

How this challenges the thesis#

This is the week most likely to overturn something you believe. Complementarity is real and widely relied upon, and the event is precisely the condition under which it stops holding: the weather that stills the wind is often the weather that puts cloud over the panels, in the season with the least daylight to lose. A portfolio justified by average complementarity can be undefended exactly when it matters.

In the session#

We push three portfolios — wind-only, solar-only, mixed — through the same event and ask a sharper question than “which is better”. Does the mix remove the failure, shorten it, or simply move it to a different hour?

Its relationship to the canonical event#

The event counts wind and solar combined, and week 6 is why. A definition that watched either source alone would miss the condition that actually threatens the system.

What next week needs#

If generation cannot be made to cover the event, something has to be stored. Week 7 is about why that is two problems, not one.