exhibit 10. 2 amendment no. 4 dated as of september 30, 2015 to facility lease ( unit 2 ) dated as of august 1, 1986, as heretofore amended, between u. s. bank national association ( successor to state street bank and trust company, successor to the first national bank of boston ), not in its individual capacity, but solely as owner trustee under a trust agreement, dated as of august 1, 1986, with emerson finance llc ( formerly emerson finance co. ) lessor and arizona public service company, lessee a 5. 2326 % undivided interest in palo verde nuclear generating station unit 2 original facility lease recorded august 18, 1986, as instrument no. 86 - 439438, and amendment no. 1, recorded november 21, 1986, as instrument no. 86 - 645156, amendment no. 2, recorded september 16, 1987, as instrument no. 87 - 579420, and amendment no. 3, recorded march 22, 1993, as instrument no. 93 - 0165872, all in the maricopa county, arizona recorder ’ s office original facility lease recorded august 18, 1986, as instrument no. 86 - 439438, and amendment no. 1, recorded november 21, 1986, as instrument no. 86 - 645156, amendment no. 2, recorded september 16, 1987, as instrument no. 87 - 579420, and amendment no. 3, recorded march 22, 1993, as instrument no. 93 - 0165872, all in the maricopa county, arizona recorder ’ s office original facility lease recorded august 18, 1986, as instrument no. 86 - 439438, and amendment no. 1, recorded november 21, 1986, as instrument no. 86 - 645156, amendment no. 2, recorded september 16, 1987, as instrument no. 87 - 579420, and amendment no. 3, recorded march 22, 1993, as instrument no. 93 - 0165872, all in the maricopa county, arizona recorder ’ s office original facility lease recorded august 18, 1986, as instrument no. 86 - 439438, and amendment no. 1, recorded november 21, 1986, as instrument no. 86 - 645156, amendment no. 2, recorded september 16, 1987, as instrument no. 87 - 579420, and amendment no