Management’s Discussion and Analysis of Financial Condition and Results of Operations – Continued Electric CECONY’s results of electric operations for the year ended December 31, 2012 compared with the year ended December 31, 2011 is as follows:
## Table 0 ##
CECONY’s electric sales and deliveries, excluding off-system sales, in 2012 compared with 2011 were:
## Table 1 ##
(a) “Residential/Religious” generally includes single-family dwellings, individual apartments in multi-family dwellings, religious organizations and certain other not-for-profit organizations.
CECONY’s electric operating revenues decreased $52 million in 2012 compared with 2011 due primarily to lower purchased power ($322 million) and fuel costs ($40 million), offset by higher revenues from the electric rate plan ($310 million).
CECONY’s revenues from electric sales are subject to a revenue decoupling mechanism, as a result of which delivery revenues generally are not affected by changes in delivery volumes from levels assumed when rates were approved.
Other electric operating revenues generally reflect changes in regulatory assets and liabilities in accordance with the revenue decoupling mechanism and other provisions of the company’s rate plans.
See Note B to the financial statements in Item 8.
Electric delivery volumes in CECONY’s service area decreased 1.1 percent in 2012 compared with 2011.
After adjusting for variations, principally weather and billing days, electric delivery volumes in CECONY’s service area increased 0.2 percent in 2012 compared with 2011.
CECONY’s electric purchased power costs decreased $322 million in 2012 compared with 2011 due to a decrease in purchased volumes ($321 million) and unit costs ($1 million).
Electric fuel costs decreased $40 million in 2012 compared with 2011 due to lower unit costs ($58 million), offset by higher sendout volumes from the company’s electric generating facilities ($18 million).
CECONY’s electric operating income decreased $2 million in 2012 compared with 2011.
The decrease reflects primarily higher operations and maintenance costs ($232 million), due primarily to higher pension expense ($149 million), and increase in surcharges that are collected in revenues from customers ($25 million) and higher support and maintenance of company underground facilities to accommodate municipal projects ($14 million), higher depreciation and amortization ($54 million) and higher taxes other than income taxes ($26 million, principally property taxes), offset in part by higher net revenues ($310 million, due primarily to the electric rate plan).
Most of the
IRON MOUNTAIN INCORPORATED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued) DECEMBER 31, 2016 (In thousands, except share and per share data) 2.
Summary of Significant Accounting Policies (Continued) 88 Entities are required to record the fair value of a liability for an asset retirement obligation in the period in which it is incurred.
Asset retirement obligations represent the costs to replace or remove tangible long-lived assets required by law, regulatory rule or contractual agreement.
When the liability is initially recorded, the entity capitalizes the cost by increasing the carrying amount of the related long-lived asset, which is then depreciated over the useful life of the related asset.
The liability is increased over time through accretion expense (included in depreciation expense) such that the liability will equate to the future cost to retire the long-lived asset at the expected retirement date.
Upon settlement of the liability, an entity either settles the obligation for its recorded amount or realizes a gain or loss upon settlement.
Our asset retirement obligations are primarily the result of requirements under our facility lease agreements which generally have "return to original condition" clauses which would require us to remove or restore items such as shred pits, vaults, demising walls and office build-outs, among others.
The significant assumptions used in estimating our aggregate asset retirement obligation are the timing of removals, the probability of a requirement to perform, estimated cost and associated expected inflation rates that are consistent with historical rates and credit-adjusted risk-free rates that approximate our incremental borrowing rate.
A reconciliation of liabilities for asset retirement obligations (included in other long-term liabilities) is as follows:
## Table 2 ##
g.  Long-Lived Assets We review long-lived assets, including all finite-lived intangible assets, for impairment whenever events or changes in circumstances indicate the carrying amount of such assets may not be recoverable.
Recoverability of these assets is determined by comparing the forecasted undiscounted net cash flows of the operation to which the assets relate to their carrying amount.
The operations are generally distinguished by the business segment and geographic region in which they operate.
If it is determined that we are unable to recover the carrying amount of the assets, the long-lived assets are written down, on a pro rata basis, to fair value.
Fair value is determined based on discounted cash flows or appraised values, depending upon the nature of the assets.
Long-lived assets, including finite-lived intangible assets, are amortized over their useful lives.
We annually, or more frequently if events or circumstances warrant, assess whether a change in the lives over which long-lived assets, including finite-lived intangible assets, are amortized is necessary.
Consolidated loss on disposal/write-down of property, plant and equipment (excluding real estate), net was $1,065 for the year ended December 31, 2014 and consisted primarily of losses associated with the write-off of certain software associated with our North American Records and Information Management Business segment.
Consolidated loss on disposal/write-down of property, plant and equipment (excluding real estate), net was $3,000 for the year ended December 31, 2015 and consisted primarily of approximately $1,800 of losses associated with the write-off of certain property in our Western European Business segment, as well as $1,500 of losses associated with the write-off of certain property in our North American Records and Information Management Business segment, partially offset by gains on the retirement of leased vehicles accounted for as capital lease assets primarily associated with our North American Records and Information Management Business segment.
Consolidated loss on disposal/write-down of property, plant and equipment (excluding real estate), net was $1,412 for the year ended December 31, 2016 and consisted primarily of losses associated with the write-off of certain software assets associated with our North American Records and Information Management Business segment, partially offset by gains on the retirement of leased vehicles accounted for as capital lease assets primarily associated with our North American Records and Information Management Business segment.
Operating profit for the segment increased by 15% in 2005 compared to 2004.
Operating profit increased by $80 million at M&FC mainly due to improved performance on fire control and air defense programs.
Performance on surface systems programs contributed to an increase in operating profit of $50 million at MS2.
PT&TS operating profit increased $10 million primarily due to improved performance on simulation and training programs.
The increase in backlog during 2006 over 2005 resulted primarily from increased orders on certain platform integration programs in PT&TS.
Space Systems Space Systems’ operating results included the following:

<table><tr><td></td><td colspan="2"> Twelve Months Ended</td><td></td></tr><tr><td> (Millions of Dollars)</td><td> December 31, 2012</td><td> December 31, 2011</td><td>Variation</td></tr><tr><td>Operating revenues</td><td>$8,176</td><td>$8,228</td><td>$-52</td></tr><tr><td>Purchased power</td><td>1,938</td><td>2,260</td><td>-322</td></tr><tr><td>Fuel</td><td>159</td><td>199</td><td>-40</td></tr><tr><td>Net revenues</td><td>6,079</td><td>5,769</td><td>310</td></tr><tr><td>Operations and maintenance</td><td>2,273</td><td>2,041</td><td>232</td></tr><tr><td>Depreciation and amortization</td><td>710</td><td>656</td><td>54</td></tr><tr><td>Taxes, other than income taxes</td><td>1,403</td><td>1,377</td><td>26</td></tr><tr><td> Electric operating income</td><td>$1,693</td><td>$1,695</td><td>$-2</td></tr></table>
<table><tr><td></td><td colspan="4">Millions of kWhs Delivered</td><td colspan="4">Revenues in Millions</td></tr><tr><td></td><td colspan="2"> Twelve Months Ended</td><td colspan="2"></td><td colspan="2"> Twelve Months Ended</td><td colspan="2"></td></tr><tr><td> Description</td><td> December 31, 2012</td><td> December 31, 2011</td><td>Variation</td><td>Percent Variation</td><td> December 31, 2012</td><td> December 31, 2011</td><td>Variation</td><td>Percent Variation</td></tr><tr><td>Residential/Religious(a)</td><td>10,718</td><td>11,404</td><td>-686</td><td>-6.0%</td><td>$2,749</td><td>$2,918</td><td>$-169</td><td>-5.8%</td></tr><tr><td>Commercial/Industrial</td><td>9,848</td><td>11,148</td><td>-1,300</td><td>-11.7</td><td>1,971</td><td>2,304</td><td>-333</td><td>-14.5</td></tr><tr><td>Retail access customers</td><td>25,990</td><td>24,234</td><td>1,756</td><td>7.2</td><td>2,750</td><td>2,354</td><td>396</td><td>16.8</td></tr><tr><td>NYPA, Municipal Agency and other sales</td><td>10,645</td><td>11,040</td><td>-395</td><td>-3.6</td><td>617</td><td>592</td><td>25</td><td>4.2</td></tr><tr><td>Other operating revenues</td><td>-</td><td>-</td><td>-</td><td>-</td><td>89</td><td>60</td><td>29</td><td>48.3</td></tr><tr><td> Total</td><td> 57,201</td><td> 57,826</td><td>-625</td><td>-1.1%</td><td>$8,176</td><td>$8,228</td><td>$-52</td><td>-0.6%</td></tr></table>
<table><tr><td></td><td colspan="2">December 31,</td></tr><tr><td></td><td>2015</td><td>2016</td></tr><tr><td>Asset Retirement Obligations, beginning of the year</td><td>$12,897</td><td>$13,997</td></tr><tr><td>Liabilities Assumed</td><td>—</td><td>10,678</td></tr><tr><td>Liabilities Incurred</td><td>1,030</td><td>687</td></tr><tr><td>Liabilities Settled</td><td>-966</td><td>-1,106</td></tr><tr><td>Accretion Expense</td><td>1,241</td><td>1,587</td></tr><tr><td>Foreign Currency Translation Adjustments</td><td>-205</td><td>-355</td></tr><tr><td>Asset Retirement Obligations, end of the year</td><td>$13,997</td><td>$25,488</td></tr></table>

Question: What is the sum of Retail access customers of Millions of kWhs Delivered Variation, Purchased power of Twelve Months Ended December 31, 2012, and Retail access customers of Revenues in Millions Twelve Months Ended December 31, 2011 ?
Answer: 6048