1. from the date on which both the solar system according to  21b paragraph 1 in conjunction with  21c was assigned to the form of sale of the tenant electricity surcharge for the first time and the requirements of  21 paragraph 3 were met for the first time, as soon as the date according to number 1 in is entered in the register and provided that paragraph 3 does not conflict with this. 2nd 3rd (3) If in a calendar year the sum of the installed capacity of the solar systems for which the information pursuant to paragraph 2 number 1 is newly entered in the register exceeds the annual volume of 500 megawatts for the first time, the operators of solar systems are not entitled to the tenant electricity surcharge, where the day according to paragraph 2 number 1 is after the last calendar day of the first calendar month in the calendar year following the exceeding. The Federal Network Agency publishes the date from which the entitlement no longer exists on its website. If the annual volume of 500 megawatts is exceeded in a calendar year, the annual volume pursuant to sentence 1 is reduced in the following calendar year by the sum of the installed capacity of solar systems that exceeds 500 megawatts, for which in the calendar year of the excess there is a right to a tenant electricity surcharge for the first time has arisen. (4) Operators of solar systems for whose electricity there was no entitlement to a tenant electricity surcharge in the previous calendar year pursuant to subsection 3 are entitled to the tenant electricity surcharge in the chronological order of the date pursuant to subsection 2 number 1 in the register from the respective following calendar year, insofar as the annual volume according to paragraph 3 is not exceeded in the corresponding calendar year. Section 25 remains unaffected.