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ORDER NO. PSC -2018 -0050 -TRF -EI DOCKET NO. 20170148 -EI PAGE 4 the company's assertion that day-to-day reliability improves with underground facilities .6 However, FPL also acknowledged that locating the cause/failure of an overhead outage and the repair/replacement of overhead facilities is generally less difficult and less time consuming than it is for underground. Therefore, in some instances, the duration of an outage may be longer as a result of underground facilities. We have previously recognized the benefits of undergrounding. In 2007, we amended Rule 25-6.115, F.A.C., to include in the CIAC calculation the cost of maintenance and storm restoration activities over time to capture the longer-term costs and benefits of undergrounding. Prior to this rule amendment, the CIAC was based on estimated work order cost only. Furthermore, we have approved a Governmental Adjustment Factor (GAF) tariff that allows local governments a 25 percent credit against the otherwise applicable CIAC for projects which convert overhead facilities to underground. The 25 percent reduction in CIAC is based on expected savings in storm restoration costs when large contiguous areas are converted from overhead to underground and is designed to encourage the installation of underground facilities by reducing the CIAC the customer is required to pay FPL. We approved the GAF tariff as a pilot in May 2007 and it became a permanent tariff in April 2010.7 The six municipalities that are currently in discussion with FPL regarding a conversion project all qualify for the GAF Waiver of 25 percent and the GAF waiver amounts have been reflected in the provided estimated CIAC amounts. For the reasons stated above we hereby approve FPL's proposed revision to tariff Sheet No. 6.300 as stated in Attachment A, and FPL's request to include the waived existing facilities cost in net plant in service. We also hereby require FPL to inform future potential underground conversion customers of the availability of additional credits. FPL has already informed the municipalities currently considering conversion projects of this possibility. Based on the foregoing, it is ORDERED by the Florida Public Service Commission that Florida Power & Light Company's Petition for Detennination Under Rule 25-6.115, F.A.C., and Approval of Associated Revised Tariff Sheet 6.300 is hereby approved. It is further ORDERED that if a protest is filed within 21 days of the issuance of this order, Revised Tariff Sheet 6.300, as stated on Attachment A, shall not go into effect pending resolution of the protest. If no timely protest is filed, this docket shall be closed and Revised Tariff Sheet 6.300, as stated on Attachment A, shall become effective upon the issuance of a consummating order. 6 Staff's Second Data Request, response to Question 8 7 Order No. PSC-10-0247-FOF-EI, issued April 22, 2010, in Docket No. 070231 -EI, In re: Petition for approval of 2007 revisions to underground residential and commercial distribution tariffs, by Florida Power & Light Company.