Note 4 — Inventories

Inventories comprise the following:



	June 30, 2018		September 30, 2017		June 30, 2017
Gas Utility natural gas	$	18,608	$	39,486	$	21,826
Materials, supplies and other	16,055		13,823		15,303
Total inventories	$	34,663	$	53,309	$	37,129

At June 30, 2018, UGI Utilities was a party to five principal storage contract administrative agreements (“SCAAs”) which have terms of up to three years. Four of the SCAAs were with UGI Energy Services, LLC (“Energy Services”), a second-tier, wholly owned subsidiary of UGI (see Note 13) and one of the SCAAs was with a non-affiliate. Pursuant to the SCAAs, UGI Utilities has, among other things, released certain storage and transportation contracts for the terms of the SCAAs. UGI Utilities also transferred certain associated storage inventories upon commencement of the SCAAs, will receive a transfer of storage inventories at the end of the SCAAs, and makes payments associated with refilling storage inventories during the terms of the SCAAs. The historical cost of natural gas storage inventories released under the SCAAs, which represents a portion of Gas Utility’s total natural gas storage inventories, and any exchange receivable (representing amounts of natural gas inventories used by the other parties to the agreement but not yet replenished for which UGI Utilities has the rights), are included in the caption “Gas Utility natural gas” in the table above.

The carrying values of gas storage inventories released under the SCAAs at June 30, 2018, September 30, 2017 and June 30, 2017, comprising 4.7 billion cubic feet (“bcf”), 9.1 bcf and 4.8 bcf of natural gas, were $11,944, $26,064 and $14,146, respectively. At June 30, 2018, September 30, 2017 and June 30, 2017, UGI Utilities held a total of $13,840, $15,040 and $15,040, respectively, of security deposits received from its SCAA counterparties. These amounts are included in “Other current liabilities” on the Condensed Consolidated Balance Sheets.

For additional information related to the SCAAs with Energy Services, see Note 13.