Blog Posts on Flexibility

What is aFRR (automatic frequency restoration reserve) and how does it work?

What is aFRR (automatic frequency restoration reserve) and how does it work? Definition The automatic Frequency Restoration Reserve (aFRR), also known as secondary reserve, is a reserve in the power grid that helps to keep the grid frequency stable. To keep the frequency within certain thresholds, the Transmission System Operators (TSOs) activate balancing services like More… (Published: 31. May 2021 by Evelyn Berschauer)
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Flexibility in the Electricity System: What does it Actually Mean?

We need more flexibility in the electricity grid, in the electricity market, in the entire electricity system. One can hear these demands repeatedly in connection with the energy transition. This is because an increase in the share of wind and solar in the electricity mix, which generate electricity in a volatile manner and can only be controlled to a limited extent, poses new challenges for the electricity grid. (Published: 13. January 2021 by Marie)
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What’s the business model of a Virtual Power Plant (VPP)?

For a couple of years now, the role of the Virtual Power Plant has been established in the energy industry. Today, it is pretty clear what a Virtual Power Plant is and why it makes sense to network, forecast, optimize, and dispatch a fleet of coordinated distributed energy resources (DER) such as wind, solar, bioenergy, hydropower, batteries, electrolyzers, and many more. But how do you make money with a Virtual Power Plant? What’s the business case of a VPP operator, or to use a synonym, of an aggregator? (Published: 27. January 2020 by Jan)
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Afraid of the dark

In the German language, there is a word that refers to the fear of having inadequate sunshine or wind to maintain a viable supply of renewable energy: dunkelflaute. The dramatic connotation of the word may be lost a bit in translation, but essentially, dunkelflaute means “a dark lull". (Published: 25. September 2018 by Jan, Hendrik, Jochen)
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Towards a more democratized energy world

This interview with Jochen Schwill (CEO of Next Kraftwerke) was first published in The Beam #5. Jochen Schwill (CEO of Next Kraftwerke) talks about the fundamentals of a Virtual Power Plant and the idea behind it. (Published: 18. April 2018 by Nils Quak)
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First shift, then store

In our future energy systems we will pretty often see times where, let’s say, a sudden storm front brings heaps of cheap and green and beautiful but, alas, in that particular time unneeded wind power into the system. And we will see times where the opposite happens: a sudden shortage of wind and solar power. What can we do about it? (Published: 16. June 2017 by Jan)
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