The present Ordinance implements the Energy Industry Act of 7 July 2005 (BGBl. I p. 1970). In particular, the Ordinance regulates access to the grid. Considering that the German transmission system operators (TSOs) have to maintain the balance between electricity generation and consumption within their control areas at all times, article 6(2) of the above-mentioned Ordinance requires that a technically needed amount of control reserve (core portion) may need to be provided from within the German