Long-term Debt Long-term debt maturing in the period 2005-2009 is as follows:
## Table 0 ##
The Utilities have issued certain series of debt through the New York State Energy Research and Development Authority (NYSERDA) that currently bear interest at a rate determined weekly and, in certain circumstances, is subject to mandatory tender for purchase by the Utilities.
This tax-exempt debt includes Con Edison of New York’s $99 million aggregate principal amount of Series 2004C and O&R’s $55 million aggregate principal amount of Series 1994A and $44 million aggregate principal amount of Series 1995A.
Long-term debt is stated at cost, which in total, as of December 31, 2004, approximates fair value (estimated based on current rates for debt of the same remaining maturities), except for $225 million of Con Edison of New York’s taxexempt financing.
See “Interest Rate Hedging” in Note P.  At December 31, 2004 and 2003, long-term debt of Con Edison and O&R included $23 million of mortgage bonds collateralized by substantially all the utility plant and other physical property of O&R’s New Jersey and Pennsylvania utility subsidiaries and for 2004, $46 million of Transition Bonds issued by O&R’s New Jersey utility subsidiary through a special purpose entity.
See Note B.
At December 31, 2004 and 2003, long-term debt of Con Edison included: $128 million and $141 million, respectively, of non-recourse debt of a Con Edison Development subsidiary collateralized by a pledge of the Lakewood (NJ) power plant, a related power purchase agreement and project assets; and $336 million and $339 million, respectively, of debt secured by the Newington (NH) power plant and related assets.
See Note T.  At December 31, 2004 and 2003, restricted cash relating to the operations of the Lakewood plant was $16 million and $17 million, respectively.
Significant Debt Covenants There are no significant debt covenants under the financing arrangements for the debentures of Con Edison, Con Edison of New York or O&R, other than obligations to pay principal and interest when due and covenants not to consolidate with or merge into any other corporation unless certain conditions are met, and no cross default provisions.
The tax-exempt financing arrangements of the Utilities are subject to these covenants and the covenants discussed below.
The Companies believe that they were in compliance with their significant debt covenants at December 31, 2004.
The tax-exempt financing arrangements involved the issuance of uncollateralized promissory notes of the Utilities to NYSERDA in exchange for the net proceeds of a like amount of tax-exempt bonds with substantially the same terms sold to the public by NYSERDA.
The tax-exempt financing arrangements include covenants with respect to the tax-exempt status of the financing, including covenants with respect to the use of the facilities financed.
The failure to comply with these covenants would, except as otherwise provided, constitute an event of default with respect to the debt to which such provisions applied.
The arrangements for certain series of Con Edison of New York’s taxexempt financing (Series 1999A, 2001A, 2001B, 2004A, B and C), aggregating $960 million, and O&R’s tax-exempt financing (Series 1994A and Series 1995A), aggregating $99 million, include provisions for the maintenance of liquidity and credit facilities, the failure to comply with which would, except as otherwise provided, constitute an event of default with respect to the debt to which such provisions applied.
If an event of default were to occur, the principal and accrued interest on the debt to which such event of default applied might and, in certain circumstances would, become due and payable immediately.
The liquidity and credit facilities currently in effect for the taxexempt financing include covenants that the ratio of debt to total capital of the obligated utility will not at any time exceed 0.65 to 1 and that, subject to certain exceptions, the utility will not mortgage, lien, pledge or otherwise encumber its assets.
Certain of the facilities also include as events of default, defaults in payments of other debt obligations in excess of specified levels ($100 million for Con Edison of New York; $13 million for O&R).
Note D – Short Term Borrowing At December 31, 2004 and 2003, Con Edison and the Utilities had commercial paper programs totaling $950 million under which short-term borrowings are made at prevailing market rates.
These programs are supported by revolving credit agreements with banks.
At December 31, 2004, $56 million was outstanding under Con Edison’s $350 million program and $100 million was outstanding under Con Edison of New York’s $500 million program, both at a weighted average interest rate of 2.2 percent.
There was no balance outstanding under O&R’s $100 million program.
At December 31, 2003, $42 million was outstanding under Con Edison’s $350 million program, $99 million was outstanding under Con Edison of New York’s $500 million program, and $15 million was outstanding under O&R’s $100 million program, all at a weighted average interest rate of 1.0 percent.
The Utilities change the amount of their programs from time to time, subject to FERC-authorized limits of $1 billion for Con Edison of New York and $150 million for O&R.
Bank commitments under the revolving credit agreements total $950 million, of which $388 million and $563 million expire in November 2005 and November 2006, respectively.
The
Purchased power expenses increased $14 million in 2018 compared with 2017 due to higher purchased volumes ($27 million), offset by lower unit costs ($13 million).
Fuel expenses increased $31 million in 2018 compared with 2017 due to higher unit costs ($38 million), offset by lower purchased volumes ($7 million).
Other operations and maintenance expenses increased $19 million in 2018 compared with 2017 due primarily to higher other employee benefits ($34 million), consultant costs ($27 million) and storm related costs ($16 million), offset in part by lower stock based compensation ($36 million) and surcharges for assessments and fees that are collected in revenues from customers ($23 million).
Depreciation and amortization increased $59 million in 2018 compared with 2017 due primarily to higher electric utility plant balances.
Taxes, other than income taxes increased $51 million in 2018 compared with 2017 due primarily to higher property taxes ($100 million) and state and local taxes ($3 million), offset in part by deferral of under-collected property taxes due to new property tax rates for fiscal year 2017 – 2018 ($26 million) and a sales and use tax refund ($26 million).
Gas CECONY’s results of gas operations for the year ended December 31, 2018 compared with the year ended December 31, 2017 were as follows:
## Table 1 ##
CECONY’s gas sales and deliveries, excluding off-system sales, in 2018 compared with 2017 were
## Table 2 ##
(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, primarily billing days, firm gas sales and transportation volumes in the company’s service area increased 5.1 percent in 2018 compared with 2017, reflecting primarily increased volumes attributable to the growth in the number of gas customers.
(c) Includes 3,326 thousands and 3,816 thousands of Dt for 2018 and 2017, 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 plan.
See Note B to the financial statements in Item 8.
Operating revenues increased $177 million in 2018 compared with 2017 due primarily to higher revenues from the gas rate plan and growth in the number of customers ($104 million) and increased gas purchased for resale expense ($133 million), offset in part by the reduction in other operating revenues resulting from the deferral as a
THE GOLDMAN SACHS GROUP, INC.  AND SUBSIDIARIES Management’s Discussion and Analysis Net Revenues The table below presents net revenues by line item.

<table><tr><td><i>(Millions of Dollars)</i></td><td><i>Con Edison</i></td><td><i>Con Edison of New York</i></td><td><i>O&R</i></td></tr><tr><td>2005</td><td>$469</td><td>$450</td><td>$2</td></tr><tr><td>2006</td><td>22</td><td>-</td><td>2</td></tr><tr><td>2007</td><td>374</td><td>330</td><td>23</td></tr><tr><td>2008</td><td>507</td><td>280</td><td>3</td></tr><tr><td>2009</td><td>491</td><td>475</td><td>3</td></tr></table>
<table><tr><td></td><td colspan="3">For the Years Ended December 31,</td></tr><tr><td>(Millions of Dollars)</td><td>2018</td><td>2017</td><td>Variation</td></tr><tr><td>Operating revenues</td><td>$2,078</td><td>$1,901</td><td>$177</td></tr><tr><td>Gas purchased for resale</td><td>643</td><td>510</td><td>133</td></tr><tr><td>Other operations and maintenance</td><td>420</td><td>413</td><td>7</td></tr><tr><td>Depreciation and amortization</td><td>205</td><td>185</td><td>20</td></tr><tr><td>Taxes, other than income taxes</td><td>332</td><td>298</td><td>34</td></tr><tr><td>Gas operating income</td><td>$478</td><td>$495</td><td>$-17</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">For the Years Ended</td><td colspan="2"></td><td colspan="2">For the Years Ended</td><td colspan="2"></td></tr><tr><td>Description</td><td>December 31, 2018</td><td>December 31, 2017</td><td>Variation</td><td>Percent Variation</td><td>December 31, 2018</td><td>December 31, 2017</td><td>Variation</td><td>Percent Variation</td></tr><tr><td>Residential</td><td>57,815</td><td>52,244</td><td>5,571</td><td>10.7%</td><td>$966</td><td>$802</td><td>$164</td><td>20.4%</td></tr><tr><td>General</td><td>34,490</td><td>30,761</td><td>3,729</td><td>12.1</td><td>390</td><td>334</td><td>56</td><td>16.8</td></tr><tr><td>Firm transportation</td><td>82,472</td><td>71,353</td><td>11,119</td><td>15.6</td><td>595</td><td>524</td><td>71</td><td>13.5</td></tr><tr><td>Total firm sales and transportation</td><td>174,777</td><td>154,358</td><td>20,419</td><td>13.2(b)</td><td>1,951</td><td>1,660</td><td>291</td><td>17.5</td></tr><tr><td>Interruptible sales (c)</td><td>7,351</td><td>7,553</td><td>-202</td><td>-2.7</td><td>40</td><td>35</td><td>5</td><td>14.3</td></tr><tr><td>NYPA</td><td>34,079</td><td>37,033</td><td>-2,954</td><td>-8.0</td><td>2</td><td>2</td><td>—</td><td>—</td></tr><tr><td>Generation plants</td><td>72,524</td><td>61,800</td><td>10,724</td><td>17.4</td><td>26</td><td>25</td><td>1</td><td>4.0</td></tr><tr><td>Other</td><td>20,822</td><td>21,317</td><td>-495</td><td>-2.3</td><td>31</td><td>31</td><td>—</td><td>—</td></tr><tr><td>Other operating revenues (d)</td><td>—</td><td>—</td><td>—</td><td>—</td><td>28</td><td>148</td><td>-120</td><td>-81.1</td></tr><tr><td>Total</td><td>309,553</td><td>282,061</td><td>27,492</td><td>9.7%</td><td>$2,078</td><td>$1,901</td><td>$177</td><td>9.3%</td></tr></table>

Question: What is the sum of the Operating revenues in the years where Gas purchased for resale is positive? (in millions)
Answer: 4156