GEM Energy Analytics

The big beautiful batteries

Going deeper on the topic of large-scale batteries and their economics

Nov 25 • 

Julien Jomaux

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October 2025

Solar at the end of 2025: weaker business case but some reasons for further growth

It’s been over three months since my last post—the longest break I’ve taken since starting this Substack, due to a mix of vacation, work commitments…

Oct 20 • 

Julien Jomaux

33

8

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July 2025

Heatwave on Europe: the impact of a "Hitzeflaute"

As a heat wave has engulfed Europe, there is a new sexy word in the European energy world: Hitzeflaute, which is an updated version of the Dunkelflaute…

Jul 3 • 

Julien Jomaux

35

5

6

May 2025

What has been the impact of solar in Europe so far this year? A Mid-May Review

Solar energy is an engaging topic that I enjoy discussing extensively.

May 19 • 

Julien Jomaux

44

5

7

April 2025

Daily spreads on the day-ahead markets

And the link with batteries

Apr 18 • 

Julien Jomaux

28

6

6

Entering spring 2025

A quick update on the impact of solar in the EU at the start of spring

Apr 4 • 

Julien Jomaux

24

5

March 2025

The German aFRR capacity market - a deeper look on prices

Mar 26 • 

Julien Jomaux

20

5

The duck is growing

A 2024 update on the hourly shape of the electricity prices in Europe.

Mar 17 • 

Julien Jomaux

43

8

February 2025

Presentation on Power Trading in Europe

I have been recently invited by Giacomo Luciani and John Gault to present a module on Power trading in Europe for the Master in Commodity Trading at the…

Feb 11 • 

Julien Jomaux

32

5

7

My sources of inspiration on energy, electricity and markets

Just some links to the persons and organizations I follow

Feb 3 • 

Julien Jomaux

59

11

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January 2025

What happens to intraday and balancing markets during a Dunkelflaute?

Have you heard of dunkelflaute? I assume you have if you're reading my Substack. The definition from Wikipedia: In the renewable energy sector, a…

Jan 17 • 

Julien Jomaux

32

5

5

December 2024

The rise of large-scale batteries in Europe

Aside from the rise of solar energy, another significant trend currently unfolding is the proliferation of large-scale batteries worldwide, and in…

Dec 23, 2024 • 

Julien Jomaux

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11