spinning reserves ‘operating’ and ‘spinning’ reserve spinning reserve operating reserve στρεφόμενη εφεδρεία Operating reserve (Wikipedia) https://en.wikipedia.org/wiki/Operating_reserve operating reserves στρεφόμενη εφεδρεία ή εφεδρεία συστήματος https://en.wikipedia.org/wiki/Operating_reserve operating reserves reserve capacity reserve capacity English ‘operating’ and ‘spinning’ reserve