INVENTORIES

Our inventory consisted of:



(in millions)	September 30, 2015		December 31, 2014
Materials, supplies, and inventories
Natural gas in storage	$	310.3	$	124.8
Materials and supplies	226.7		150.2
Fossil fuel	182.8		125.6
Total	$	719.8	$	400.6

PGL and NSG price natural gas storage injections at the calendar year average of the cost of natural gas supply purchased. Withdrawals from storage are priced on the Last-In, First-Out (LIFO) cost method. For interim periods, the difference between current projected replacement cost and the LIFO cost for quantities of natural gas temporarily withdrawn from storage is recorded as a temporary LIFO liquidation debit or credit. At September 30, 2015, all LIFO layers were replenished, and the LIFO liquidation balance was zero.

Substantially all other natural gas in storage, materials and supplies, and fossil fuel inventories are recorded using the weighted-average cost method of accounting.