This could only have been invented in the Netherlands, notorious for lack of space. The idea to cover artificial grass sports fields with rollable thin film solar during the many hours the fields aren’t used. They are working on a solution to fully automate the idea.
Back-of-an-envelope calculation: hockey-field 100 x 60 meter = 6,000 m2 = 3,750 standard 300 Watt solar panels. One such panel in the Netherlands yields 0.85 x 300 = 255 kWh/year. The loss due to horizontal position is merely 10% –> 220 kWh/year. Entire field: 825,000 kWh/year. Consumer electricity price equivalent = 825,000 x 22 eurocent/kWh = 181,500 euro/year.
The chap in the video claims that in the small town of Zwolle, there are 70 sports fields, with half of them equipped with artificial grass. 60% of the time, these fields are not in use. One such field can provide sufficient energy to power 85 households (electricity + heating).
[solarmagazine.nl] – Zonnetapijt wint Innovation Challenge Energieneutrale Sportaccommodaties
[rtvfocuszwolle.nl] – Zonnetapijt winnaar van de Energy Pitch Overijssel
[siderea.nl] – De Ideale Hellingshoek (only 10% loss for horizontal positioning)
The idea could perhaps look a little like this: