Notes to the Financial Statements — Continued pending against the company seeking generally unspecified damages and, in one case, punitive damages, for personal injury, property damage and business interruption.
The company has notified its insurers of the incident and believes that the policies in force at the time of the incident will cover the company’s costs, in excess of a required retention (the amount of which is not material), to satisfy any liability it may have for damages in connection with the incident.
The company is unable to estimate the amount or range of its possible loss related to the incident.
At December 31, 2014, the company had not accrued a liability for the incident.
Other Contingencies See “Other Regulatory Matters” in Note B.
Guarantees Con Edison and its subsidiaries enter into various agreements providing financial or performance assurance primarily to third parties on behalf of their subsidiaries.
Maximum amounts guaranteed by Con Edison totaled $2,547 million and $1,331 million at December 31, 2014 and 2013, respectively.
A summary, by type and term, of Con Edison’s total guarantees at December 31, 2014 is as follows:
## Table 0 ##
NY Transco – Con Edison has guaranteed payment by its subsidiary, Con Edison Transmission, of the contributions it agreed to make in New York Transco LLC (NY Transco).
Con Edison Transmission acquired a 46 percent interest in NY Transco when it was formed in 2014.
NY Transco’s transmission projects are expected to be developed initially by CECONY and other New York transmission owners and then sold to NY Transco.
The development and sale of the projects would be subject to authorizations from the NYSPSC, FERC and other federal, state and local agencies.
Guarantee amount shown is for the maximum possible required amount of Con Edison Transmission’s contributions, which assumed that all the NY Transco projects proposed when NY Transco was formed receive all required regulatory approvals and are completed at 175 percent of their estimated costs and that NY Transco does not use any debt financing for the projects.
Guarantee term shown is assumed as the timing of the contributions is not known.
Energy Transactions – Con Edison guarantees payments on behalf of its competitive energy businesses in order to facilitate physical and financial transactions in gas, pipeline capacity, transportation, oil, electricity, renewable energy credits and energy services.
To the extent that liabilities exist under the contracts subject to these guarantees, such liabilities are included in Con Edison’s consolidated balance sheet.
Renewable Electric Production Projects – Con Edison and Con Edison Development guarantee payments associated with the investment in solar and wind energy facilities on behalf of their wholly-owned subsidiaries.
In addition, Con Edison Development has entered into two guarantees ($63 million maximum and $31 million maximum, respectively) on behalf of entities (Copper Mountain Solar 2 and Copper Mountain Solar 3, respectively) in which it has a 50 percent interest (see Note Q) in connection with the construction of solar energy facilities.
Con Edison Development also provided $3 million in guarantees to Travelers Insurance Company for indemnity agreements for surety bonds in connection with the construction and operation of solar energy facilities performed by its subsidiaries.
Other – Other guarantees primarily relate to guarantees provided by Con Edison to Travelers Insurance Company for indemnity agreements for surety bonds in connection with energy service projects performed by Con Edison Solutions ($25 million).
In addition, Con Edison issued a guarantee to the Public Utility Commission of Texas covering obligations of Con Edison Solutions as a retail electric provider.
Con Edison’s estimate of the maximum potential obligation for this guarantee is $5 million as of December 31, 2014.
Notes to the Financial Statements — Continued in net income.
A summary of changes in the status of timebased awards during the year ended December 31, 2014 is as follows:
## Table 1 ##
The total expense to be recognized by Con Edison in future periods for unvested time-based awards outstanding as of December 31, 2014 for Con Edison was $2 million, including $2 million for CECONY, and is expected to be recognized over a weighted average period of one year.
Under the LTIP, each non-employee director receives stock units, which are deferred until the director’s separation from service or another date specified by the director.
Each director may also elect to defer all or a portion of their cash compensation into additional stock units, which are deferred until the director’s termination of service or another date specified by the director.
Non-employee directors’ stock units issued under the LTIP are considered “equity awards,” because they may only be settled in shares.
Directors immediately vest in units issued to them.
The fair value of the units is determined using the closing price of Con Edison’s common stock on the business day immediately preceding the date of issue.
In the year ended December 31, 2014, approximately 37,972 units were issued at a weighted average grant date price of $55.51.
Stock Purchase Plan The Stock Purchase Plan, which was approved by shareholders in 2004 and 2014, provides for the Companies to contribute up to $1 for each $9 invested by their directors, officers or employees to purchase Con Edison common stock under the plan.
Eligible participants may invest up to $25,000 during any calendar year (subject to an additional limitation for officers and employees of not more than 20 percent of their pay).
Dividends paid on shares held under the plan are reinvested in additional shares unless otherwise directed by the participant.
Participants in the plan immediately vest in shares purchased by them under the plan.
The fair value of the shares of Con Edison common stock purchased under the plan was calculated using the average of the high and low composite sale prices at which shares were traded at the New York Stock Exchange on the trading day immediately preceding such purchase dates.
During 2014, 2013 and 2012, 708,276, 864,281 and 665,718 shares were purchased under the Stock Purchase Plan at a weighted average price of $56.23, $57.24 and $59.72 per share, respectively.
Note N – Financial Information by Business Segment The business segments of each of the Companies, which are its operating segments, were determined based on management’s reporting and decision-making requirements in accordance with the accounting rules for segment reporting.
Con Edison’s principal business segments are CECONY’s regulated utility activities, O&R’s regulated utility activities and Con Edison’s competitive energy businesses.
CECONY’s principal business segments are its regulated electric, gas and steam utility activities.
All revenues of these business segments are from customers located in the United States of America.
Also, all assets of the business segments are located in the United States of America.
The accounting policies of the segments are the same as those described in Note A.
Common services shared by the business segments are assigned directly or allocated based on various cost factors, depending on the nature of the service provided.
Management’s Discussion and Analysis of Financial Condition and Results of Operations – Continued Gas CECONY’s results of gas operations for the year ended December 31, 2013 compared with the year ended December 31, 2012 is as follows:
## Table 2 ##
CECONY’s gas sales and deliveries, excluding off-system sales, in 2013 compared with 2012 were:
## Table 3 ##
(a) Revenues from gas sales are subject to a weather normalization clause and a revenue decoupling mechanism as a result of which delivery revenues are generally not affected by changes in delivery volumes from levels assumed when rates were approved.
(b) After adjusting for variations, principally weather and billing days, firm gas sales and transportation volumes in the company’s service area increased 4.6 percent in 2013 compared with 2012.
(c) Includes 5,362 and 563 thousands of Dt for 2013 and 2012, respectively, which are also reflected in firm transportation and other.
(d) Other gas operating revenues generally reflect changes in regulatory assets and liabilities in accordance with the company’s rate plans.
See Note B to the financial statements in Item 8.
Operating revenues increased $201 million in 2013 compared with 2012 due primarily to an increase in gas purchased for resale expenses ($145 million) and higher revenues from the gas rate plan and other regulatory matters ($62 million).
Gas purchased for resale increased $145 million in 2013 compared with 2012 due to higher sendout volumes ($91 million) and unit costs ($54 million).
Other operations and maintenance expenses increased $21 million due primarily to an increase in the surcharges for assessments and fees that are collected in revenues from customers ($29 million), offset in part by lower pension costs ($6 million) and healthcare costs ($3 million).
Depreciation and amortization increased $10 million due primarily to higher gas utility plant balances.
Taxes, other than income taxes increased $9 million principally due to higher local revenue taxes and property taxes.
in asset positions, which totaled $41.2 million at June 30, 2009.
To manage this risk, we have established strict counterparty credit guidelines that are continually monitored and reported to management.
Accordingly, management believes risk of loss under these hedging contracts is remote.
Certain of our derivative fi nancial instruments contain credit-risk-related contingent features.
As of June 30, 2009, we were in compliance with such features and there were no derivative financial instruments with credit-risk-related contingent features that were in a net liability position.
Market Risk We use a value-at-risk model to assess the market risk of our derivative fi nancial instruments.
Value-at-risk rep resents the potential losses for an instrument or portfolio from adverse changes in market factors for a specifi ed time period and confi dence level.
We estimate value- at-risk across all of our derivative fi nancial instruments using a model with historical volatilities and correlations calculated over the past 250-day period.
The high, low and average measured value-at-risk for the twelve months ended June 30, 2009 and 2008 related to our foreign exchange and interest rate contracts are as follows:

<table><tr><td> Guarantee Type</td><td> 0 – 3 years</td><td> 4 – 10 years</td><td> > 10 years</td><td> Total</td></tr><tr><td></td><td colspan="4"> (Millions of Dollars)</td></tr><tr><td>NY Transco</td><td>$1,361</td><td>$-</td><td>$-</td><td>$1,361</td></tr><tr><td>Energy transactions</td><td>774</td><td>31</td><td>96</td><td>901</td></tr><tr><td>Renewable electric production projects</td><td>248</td><td>-</td><td>7</td><td>255</td></tr><tr><td>Other</td><td>30</td><td>-</td><td>-</td><td>30</td></tr><tr><td>Total</td><td>$2,413</td><td>$31</td><td>$103</td><td>$2,547</td></tr></table>
<table><tr><td></td><td colspan="2"> Con Edison</td><td colspan="2"> CECONY</td></tr><tr><td></td><td>Units</td><td> Weighted Average Grant Date Fair Value</td><td>Units</td><td> Weighted Average Grant Date Fair Value</td></tr><tr><td>Non-vested at 12/31/13</td><td>66,580</td><td>$56.92</td><td>63,030</td><td>$56.93</td></tr><tr><td>Granted</td><td>22,990</td><td>53.65</td><td>21,790</td><td>53.65</td></tr><tr><td>Vested</td><td>-20,900</td><td>50.74</td><td>-19,800</td><td>50.75</td></tr><tr><td>Forfeited</td><td>-3,247</td><td>58.06</td><td>-2,847</td><td>58.27</td></tr><tr><td>Non-vested at 12/31/14</td><td>65,423</td><td>$57.65</td><td>62,173</td><td>$57.64</td></tr></table>
<table><tr><td></td><td colspan="2"> Twelve Months Ended</td><td></td></tr><tr><td> (Millions of Dollars)</td><td> December 31, 2013</td><td> December 31, 2012</td><td> Variation</td></tr><tr><td>Operating revenues</td><td>$1,616</td><td>$1,415</td><td>$201</td></tr><tr><td>Gas purchased for resale</td><td>532</td><td>387</td><td>145</td></tr><tr><td>Other operations and maintenance</td><td>351</td><td>330</td><td>21</td></tr><tr><td>Depreciation and amortization</td><td>130</td><td>120</td><td>10</td></tr><tr><td>Taxes, other than income taxes</td><td>241</td><td>232</td><td>9</td></tr><tr><td> Gas operating income</td><td>$362</td><td>$346</td><td>$16</td></tr></table>
<table><tr><td></td><td colspan="4">Thousands of Dt Delivered</td><td colspan="4">Revenues in Millions(a)</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, 2013</td><td> December 31, 2012</td><td>Variation</td><td>Percent Variation</td><td> December 31, 2013</td><td> December 31, 2012</td><td>Variation</td><td>Percent Variation</td></tr><tr><td>Residential</td><td>38,872</td><td>33,457</td><td>5,415</td><td>16.2%</td><td>$720</td><td>$607</td><td>$113</td><td>18.6%</td></tr><tr><td>General</td><td>28,135</td><td>24,138</td><td>3,997</td><td>16.6</td><td>339</td><td>282</td><td>57</td><td>20.2</td></tr><tr><td>Firm transportation</td><td>61,139</td><td>52,860</td><td>8,279</td><td>15.7</td><td>414</td><td>380</td><td>34</td><td>8.9</td></tr><tr><td> Total firm sales and transportation</td><td> 128,146</td><td> 110,455</td><td>17,691</td><td>16.0(b)</td><td>1,473</td><td>1,269</td><td>204</td><td>16.1</td></tr><tr><td>Interruptible sales(c)</td><td>10,900</td><td>5,961</td><td>4,939</td><td>82.9</td><td>69</td><td>39</td><td>30</td><td>76.9</td></tr><tr><td>NYPA</td><td>48,682</td><td>48,107</td><td>575</td><td>1.2</td><td>2</td><td>2</td><td>-</td><td>-</td></tr><tr><td>Generation plants</td><td>62,764</td><td>85,827</td><td>-23,063</td><td>-26.9</td><td>26</td><td>32</td><td>-6</td><td>-18.8</td></tr><tr><td>Other</td><td>24,615</td><td>22,259</td><td>2,356</td><td>10.6</td><td>45</td><td>36</td><td>9</td><td>25.0</td></tr><tr><td>Other operating revenues(d)</td><td>-</td><td>-</td><td>-</td><td>-</td><td>1</td><td>37</td><td>-36</td><td>-97.3</td></tr><tr><td> Total</td><td> 275,107</td><td> 272,609</td><td>2,498</td><td>0.9%</td><td>$1,616</td><td>$1,415</td><td>$201</td><td>14.2%</td></tr></table>

Question: What is the sum of the Gas purchased for resale in the years where Operating revenuesis positive? (in million)
Answer: 919