PART II DUKE ENERGY CORPORATION ?
DUKE ENERGY CAROLINAS, LLC ?
PROGRESS ENERGY, INC.  ?
DUKE ENERGY PROGRESS, LLC ?
DUKE ENERGY FLORIDA, LLC ?
DUKE ENERGY OHIO, INC.  ?
DUKE ENERGY INDIANA, LLC ?
PIEDMONT NATURAL GAS COMPANY, INC.
Combined Notes to Consolidated Financial Statements – (Continued) Long-Lived Asset Impairments The Duke Energy Registrants evaluate long-lived assets, excluding goodwill, for impairment when circumstances indicate the carrying value of those assets may not be recoverable.
An impairment exists when a long-lived asset’s carrying value exceeds the estimated undiscounted cash flows expected to result from the use and eventual disposition of the asset.
The estimated cash flows may be based on alternative expected outcomes that are probability weighted.
If the carrying value of the long-lived asset is not recoverable based on these estimated future undiscounted cash flows, the carrying value of the asset is written-down to its then-current estimated fair value and an impairment charge is recognized.
The Duke Energy Registrants assess fair value of long-lived assets using various methods, including recent comparable third-party sales, internally developed discounted cash flow analysis and analysis from outside advisors.
Triggering events to reassess cash flows may include, but are not limited to, significant changes in commodity prices, the condition of an asset or management’s interest in selling the asset.
Property, Plant and Equipment Property, plant and equipment are stated at the lower of depreciated historical cost net of any disallowances or fair value, if impaired.
The Duke Energy Registrants capitalize all construction-related direct labor and material costs, as well as indirect construction costs such as general engineering, taxes and financing costs.
See “Allowance for Funds Used During Construction (AFUDC) and Interest Capitalized” for information on capitalized financing costs.
Costs of renewals and betterments that extend the useful life of property, plant and equipment are also capitalized.
The cost of repairs, replacements and major maintenance projects, which do not extend the useful life or increase the expected output of the asset, are expensed as incurred.
Depreciation is generally computed over the estimated useful life of the asset using the composite straight-line method.
Depreciation studies are conducted periodically to update composite rates and are approved by state utility commissions and/or the FERC when required.
The composite weighted average depreciation rates, excluding nuclear fuel, are included in the table that follows
## Table 0 ##
(a) Piedmont’s weighted average depreciation rate was 2.4 percent, 2.4 percent, and 2.5 percent for the annualized two months ended December 31, 2016 and for the years ended October 31, 2016 and 2015, respectively.
In general, when the Duke Energy Registrants retire regulated property, plant and equipment, the original cost plus the cost of retirement, less salvage value, is charged to accumulated depreciation.
However, when it becomes probable the asset will be retired substantially in advance of its original expected useful life or is abandoned, the cost of the asset and the corresponding accumulated depreciation is recognized as a separate asset.
If the asset is still in operation, the net amount is classified as Generation facilities to be retired, net on the Consolidated Balance Sheets.
If the asset is no longer operating, the net amount is classified in Regulatory assets on the Consolidated Balance Sheets if deemed recoverable (see discussion of long-lived asset impairments above).
When it becomes probable an asset will be abandoned, the cost of the asset and accumulated depreciation is reclassified to Regulatory assets on the Consolidated Balance Sheets for amounts recoverable in rates.
The carrying value of the asset is based on historical cost if the Duke Energy Registrants are allowed to recover the remaining net book value and a return equal to at least the incremental borrowing rate.
If not, an impairment is recognized to the extent the net book value of the asset exceeds the present value of future revenues discounted at the incremental borrowing rate.
When the Duke Energy Registrants sell entire regulated operating units, or retire or sell nonregulated properties, the original cost and accumulated depreciation and amortization balances are removed from Property, Plant and Equipment on the Consolidated Balance Sheets.
Any gain or loss is recorded in earnings, unless otherwise required by the applicable regulatory body.
See Note 10 for further information.
Nuclear Fuel Nuclear fuel is classified as Property, Plant and Equipment on the Consolidated Balance Sheets, except for Duke Energy Florida.
Nuclear fuel amounts at Duke Energy Florida were reclassified to Regulatory assets pursuant to the Revised and Restated Stipulation and Settlement Agreement approved in November 2013 among Duke Energy Florida, the Florida Office of Public Counsel (Florida OPC) and other customer advocates (the 2013 Settlement).
Nuclear fuel in the front-end fuel processing phase is considered work in progress and not amortized until placed in service.
Amortization of nuclear fuel is included within Fuel used in electric generation and purchased power on the Consolidated Statements of Operations.
Amortization is recorded using the units-of-production method.
Allowance for Funds Used During Construction and Interest Capitalized For regulated operations, the debt and equity costs of financing the construction of property, plant and equipment are reflected as AFUDC and capitalized as a component of the cost of property, plant and equipment.
AFUDC equity is reported on the Consolidated Statements of Operations as non-cash income in Other income and expenses, net.
AFUDC debt is reported as a noncash offset to Interest Expense.
After construction is completed, the Duke Energy Registrants are permitted to recover these costs through their inclusion in rate base and the corresponding subsequent depreciation or amortization of those regulated assets.
AFUDC equity, a permanent difference for income taxes, reduces the effective tax rate (ETR) when capitalized and increases the ETR when depreciated or amortized.
See Note 22 for additional information.
For nonregulated operations, interest is capitalized during the construction phase with an offsetting non-cash credit to Interest Expense on the Consolidated Statements of Operations.
PART I 6 ITEM 1.  BUSINESS DUKE ENERGY General Duke Energy Corporation (collectively with its subsidiaries, Duke Energy) was incorporated on May 3, 2005, and is an energy company headquartered in Charlotte, North Carolina, subject to regulation by the Federal Energy Regulatory Commission (FERC).
Duke Energy operates in the United States (U. S. ) primarily through its direct and indirect subsidiaries.
Certain Duke Energy subsidiaries are also subsidiary registrants, including Duke Energy Carolinas, LLC (Duke Energy Carolinas); Progress Energy, Inc.  (Progress Energy); Duke Energy Progress, LLC (Duke Energy Progress); Duke Energy Florida, LLC (Duke Energy Florida); Duke Energy Ohio, Inc.  (Duke Energy Ohio); Duke Energy Indiana, LLC (Duke Energy Indiana) and Piedmont Natural Gas Company, Inc.  (Piedmont).
When discussing Duke Energy’s consolidated financial information, it necessarily includes the results of its separate subsidiary registrants (collectively referred to as the Subsidiary Registrants), which along with Duke Energy, are collectively referred to as the Duke Energy Registrants.
Piedmont, a North Carolina corporation, is an energy services company whose principal business is the distribution of natural gas to over 1 million residential, commercial, industrial and power generation customers in portions of North Carolina, South Carolina and Tennessee, including customers served by municipalities who are Piedmont’s sales for resale customers.
In October 2016, Duke Energy completed the acquisition of Piedmont.
Piedmont’s earnings and cash flows are only included in Duke Energy’s consolidated results subsequent to the acquisition date.
See Note 2 to the Consolidated Financial Statements, “Acquisitions and Dispositions,” for additional information regarding the acquisition.
In December 2016, Duke Energy completed an exit of the Latin American market to focus on its domestic regulated business, which was further bolstered by the acquisition of Piedmont.
The sale of the International Energy business segment, excluding an equity method investment in National Methanol Company (NMC), was completed through two transactions including a sale of assets in Brazil to China Three Gorges (Luxembourg) Energy S. à. r. l.  (CTG) and a sale of Duke Energy’s remaining Latin American assets in Peru, Chile, Ecuador, Guatemala, El Salvador and Argentina to ISQ Enerlam Aggregator, L. P.  and Enerlam (UK) Holding Ltd.  (I Squared) (collectively, the International Disposal Group).
See Note 2 to the Consolidated Financial Statements, “Acquisitions and Dispositions,” for additional information on the sale of International Energy.
The Duke Energy Registrants electronically file reports with the Securities and Exchange Commission (SEC), including Annual Reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, proxies and amendments to such reports.
The public may read and copy any materials the Duke Energy Registrants file with the SEC at the SEC’s Public Reference Room at 100 F Street, NE, Washington, DC 20549.
The public may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330.
The SEC also maintains an internet site that contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC at http://www.
sec.
gov.
Additionally, information about the Duke Energy Registrants, including reports filed with the SEC, is available through Duke Energy’s website at http://www.
duke-energy.
com.
Such reports are accessible at no charge and are made available as soon as reasonably practicable after such material is filed with or furnished to the SEC.
Business Segments Duke Energy’s segment structure includes three reportable operating segments (business segments); Electric Utilities and Infrastructure, Gas Utilities and Infrastructure and Commercial Renewables.
The remainder of Duke Energy’s operations is presented as Other.
Duke Energy’s chief operating decision-maker routinely reviews financial information about each of these business segments in deciding how to allocate resources and evaluate the performance of the business.
For additional information on each of these business segments, including financial and geographic information, see Note 3 to the Consolidated Financial Statements, “Business Segments.
” The following sections describe the business and operations of each of Duke Energy’s business segments, as well as Other.
ELECTRIC UTILITIES AND INFRASTRUCTURE Electric Utilities and Infrastructure conducts operations primarily through the regulated public utilities of Duke Energy Carolinas, Duke Energy Progress, Duke Energy Florida, Duke Energy Indiana and Duke Energy Ohio.
Electric Utilities and Infrastructure provides retail electric service through the generation, transmission, distribution and sale of electricity to approximately 7.6 million customers within the Southeast and Midwest regions of the U. S.  The service territory is approximately 95,000 square miles across six states with a total estimated population of 24 million people.
The operations include electricity sold wholesale to municipalities, electric cooperative utilities and other load-serving entities.
Electric Utilities and Infrastructure is also a joint owner in certain electric transmission projects.
Electric Utilities and Infrastructure has a 50 percent ownership interest in Duke-American Transmission Co.  (DATC), a partnership with American Transmission Company, formed to design, build and operate transmission infrastructure.
DATC owns 72 percent of the transmission service rights to Path 15, an 84-mile transmission line in central California.
Electric Utilities and Infrastructure also has a 50 percent ownership interest in Pioneer Transmission, LLC, which builds, owns and operates electric transmission facilities in North America.
The electric operations and investments in projects are subject to the rules and regulations of the FERC, the North Carolina Utilities Commission (NCUC), the Public Service Commission of South Carolina (PSCSC), the Florida Public Service Commission (FPSC), the Indiana Utility Regulatory Commission (IURC), the Public Utilities Commission of Ohio (PUCO) and the Kentucky Public Service Commission (KPSC).
The following table represents the distribution of billed sales by customer class for the year ended December 31, 2017.
## Table 1 ##
PART II DUKE ENERGY CORPORATION ?
DUKE ENERGY CAROLINAS, LLC ?
PROGRESS ENERGY, INC.  ?
DUKE ENERGY PROGRESS, LLC ?
DUKE ENERGY FLORIDA, LLC ?
DUKE ENERGY OHIO, INC.  ?
DUKE ENERGY INDIANA, LLC ?
PIEDMONT NATURAL GAS COMPANY, INC.
## Table 2 ##
(a) Includes utilization of NOL (Net operating loss) carryforwards and tax credit carryforwards of $428 million at Duke Energy, $74 million at Progress Energy, $36 million at Duke Energy Florida, $17 million at Duke Energy Ohio, $42 million at Duke Energy Indiana and $79 million at Piedmont.
In addition the total deferred income taxes Includes benefits of NOL carryforwards and tax credit carryforwards of $10 million at Duke Energy Carolinas and $1 million at Duke Energy Progress.
(b) As a result of the Tax Act, Duke Energy’s deferred tax assets and liabilities were revalued as of December 31, 2017.
See the Statutory Rate Reconciliation section below for additional information on the Tax Act’s impact on income tax expense.
## Table 3 ##
(a) Includes benefits of NOL carryforwards and utilization of NOL and tax credit carryforwards of $648 million at Duke Energy, $4 million at Duke Energy Carolinas, $190 million at Progress Energy, $60 million at Duke Energy Progress, $49 million at Duke Energy Florida, $26 million at Duke Energy Ohio and $58 million at Duke Energy Indiana.
2014 compared to 2013 MST’s net sales decreased $305 million, or 3%, in 2014 as compared to 2013.
Net sales decreased by approximately $305 million due to the wind-down or completion of certain C4ISR programs (primarily PTDS); about $85 million for undersea systems programs due to decreased volume and deliveries; and about $55 million related to the settlements of contract cost matters on certain programs in 2013 that were not repeated in 2014 (including a portion of the terminated presidential helicopter program).
The decreases were partially offset by higher net sales of approximately $80 million for integrated warfare systems and sensors programs due to increased volume (primarily Space Fence); and approximately $40 million for training and logistics solutions programs due to increased deliveries (primarily Close Combat Tactical Trainer).
MST’s operating profit decreased $129 million, or 12%, in 2014 as compared to 2013.
The decrease was primarily attributable to lower operating profit of approximately $120 million related to the settlements of contract cost matters on certain programs in 2013 that were not repeated in 2014 (including a portion of the terminated presidential helicopter program); approximately $55 million due to the reasons described above for lower C4ISR program sales, as well as performance matters on an international program; and approximately $45 million due to higher reserves recorded on certain training and logistics solutions programs.
The decreases were partially offset by higher operating profit of approximately $45 million for performance matters and reserves recorded in 2013 that were not repeated in 2014; and about $60 million for various programs due to increased risk retirements (including MH-60 and radar surveillance programs).
Adjustments not related to volume, including net profit booking rate adjustments and other matters, were approximately $85 million lower for 2014 compared to 2013.
Backlog Backlog increased in 2015 compared to 2014 primarily due to the addition of Sikorsky backlog, as well as higher orders on new program starts (such as Australian Defence Force Pilot Training System).
Backlog increased in 2014 compared to 2013 primarily due to higher orders on new program starts (such as Space Fence).
Trends We expect MST’s 2016 net sales to increase in the mid-double digit percentage range compared to 2015 net sales due to the inclusion of Sikorsky programs for a full year, partially offset by a decline in volume due to the wind-down or completion of certain programs.
Operating profit is expected to be equivalent to 2015 on higher volume, and operating margin is expected to decline due to costs associated with the Sikorsky acquisition, including the impact of purchase accounting adjustments, integration costs and inherited restructuring costs associated with actions committed to by Sikorsky prior to acquisition.
Space Systems Our Space Systems business segment is engaged in the research and development, design, engineering and production of satellites, strategic and defensive missile systems and space transportation systems.
Space Systems provides network-enabled situational awareness and integrates complex global systems to help our customers gather, analyze, and securely distribute critical intelligence data.
Space Systems is also responsible for various classified systems and services in support of vital national security systems.
Space Systems’ major programs include the Trident II D5 Fleet Ballistic Missile (FBM), Orion, Space Based Infrared System (SBIRS), AEHF, GPS-III, Geostationary Operational Environmental Satellite R-Series (GOES-R), and MUOS.
Operating profit for our Space Systems business segment includes our share of earnings for our investment in ULA, which provides expendable launch services to the U. S.  Government.
Space Systems’ operating results included the following (in millions):

<table><tr><td></td><td colspan="3">Years Ended December 31,</td></tr><tr><td></td><td>2017</td><td>2016</td><td>2015</td></tr><tr><td>Duke Energy</td><td>2.8%</td><td>2.8%</td><td>2.9%</td></tr><tr><td>Duke Energy Carolinas</td><td>2.8%</td><td>2.8%</td><td>2.8%</td></tr><tr><td>Progress Energy</td><td>2.6%</td><td>2.7%</td><td>2.6%</td></tr><tr><td>Duke Energy Progress</td><td>2.6%</td><td>2.6%</td><td>2.6%</td></tr><tr><td>Duke Energy Florida</td><td>2.8%</td><td>2.8%</td><td>2.7%</td></tr><tr><td>Duke Energy Ohio</td><td>2.8%</td><td>2.6%</td><td>2.7%</td></tr><tr><td>Duke Energy Indiana</td><td>3.0%</td><td>3.1%</td><td>3.0%</td></tr><tr><td>Piedmont<sup>(a)</sup></td><td>2.3%</td><td></td><td></td></tr></table>
<table><tr><td></td><td>Duke Energy Carolinas</td><td>Duke Energy Progress</td><td>Duke Energy Florida</td><td>Duke Energy Ohio</td><td>Duke Energy Indiana</td></tr><tr><td>Residential</td><td>30%</td><td>26%</td><td>49%</td><td>34%</td><td>26%</td></tr><tr><td>General service</td><td>33%</td><td>23%</td><td>37%</td><td>38%</td><td>25%</td></tr><tr><td>Industrial</td><td>25%</td><td>16%</td><td>8%</td><td>23%</td><td>32%</td></tr><tr><td>Total retail sales</td><td>88%</td><td>65%</td><td>94%</td><td>95%</td><td>83%</td></tr><tr><td>Wholesale and other sales</td><td>12%</td><td>35%</td><td>6%</td><td>5%</td><td>17%</td></tr><tr><td>Total sales</td><td>100%</td><td>100%</td><td>100%</td><td>100%</td><td>100%</td></tr></table>
<table><tr><td></td><td colspan="8">Year Ended December 31, 2017</td></tr><tr><td>(in millions)</td><td>Duke Energy</td><td>Duke Energy Carolinas</td><td>Progress Energy</td><td>Duke Energy Progress</td><td>Duke Energy Florida</td><td>Duke Energy Ohio</td><td>Duke Energy Indiana</td><td>Piedmont</td></tr><tr><td>Current income taxes</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Federal</td><td>$-247</td><td>$221</td><td>$-436</td><td>$-95</td><td>$-188</td><td>$-37</td><td>$128</td><td>$-90</td></tr><tr><td>State</td><td>4</td><td>20</td><td>-5</td><td>2</td><td>-11</td><td>2</td><td>21</td><td>-3</td></tr><tr><td>Foreign</td><td>3</td><td>—</td><td>—</td><td>—</td><td>—</td><td>—</td><td>—</td><td>—</td></tr><tr><td>Total current income taxes</td><td>-240</td><td>241</td><td>-441</td><td>-93</td><td>-199</td><td>-35</td><td>149</td><td>-93</td></tr><tr><td>Deferred income taxes</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Federal</td><td>1,344</td><td>381</td><td>664</td><td>378</td><td>194</td><td>99</td><td>138</td><td>147</td></tr><tr><td>State</td><td>102</td><td>35</td><td>44</td><td>10</td><td>51</td><td>-4</td><td>14</td><td>8</td></tr><tr><td>Total deferred income taxes<sup>(a) (b)</sup></td><td>1,446</td><td>416</td><td>708</td><td>388</td><td>245</td><td>95</td><td>152</td><td>155</td></tr><tr><td>Investment tax credit amortization</td><td>-10</td><td>-5</td><td>-3</td><td>-3</td><td>—</td><td>-1</td><td>—</td><td>—</td></tr><tr><td>Income tax expense from continuing operations</td><td>1,196</td><td>652</td><td>264</td><td>292</td><td>46</td><td>59</td><td>301</td><td>62</td></tr><tr><td>Tax benefit from discontinued operations</td><td>-6</td><td>—</td><td>—</td><td>—</td><td>—</td><td>—</td><td>—</td><td>—</td></tr><tr><td>Total income tax expense included in Consolidated Statements of Operations</td><td>$1,190</td><td>$652</td><td>$264</td><td>$292</td><td>$46</td><td>$59</td><td>$301</td><td>$62</td></tr></table>
<table><tr><td></td><td colspan="7">Year Ended December 31, 2016</td></tr><tr><td>(in millions)</td><td>Duke Energy</td><td>Duke Energy Carolinas</td><td>Progress Energy</td><td>Duke Energy Progress</td><td>Duke Energy Florida</td><td>Duke Energy Ohio</td><td>Duke Energy Indiana</td></tr><tr><td>Current income taxes</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Federal</td><td>$—</td><td>$139</td><td>$15</td><td>$-59</td><td>$76</td><td>$-7</td><td>$7</td></tr><tr><td>State</td><td>-15</td><td>25</td><td>-19</td><td>-25</td><td>22</td><td>-13</td><td>6</td></tr><tr><td>Foreign</td><td>2</td><td>—</td><td>—</td><td>—</td><td>—</td><td>—</td><td>—</td></tr><tr><td>Total current income taxes</td><td>-13</td><td>164</td><td>-4</td><td>-84</td><td>98</td><td>-20</td><td>13</td></tr><tr><td>Deferred income taxes</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Federal</td><td>1,064</td><td>430</td><td>486</td><td>350</td><td>199</td><td>88</td><td>202</td></tr><tr><td>State</td><td>117</td><td>45</td><td>50</td><td>40</td><td>25</td><td>11</td><td>11</td></tr><tr><td>Total deferred income taxes<sup>(a)</sup></td><td>1,181</td><td>475</td><td>536</td><td>390</td><td>224</td><td>99</td><td>213</td></tr><tr><td>Investment tax credit amortization</td><td>-12</td><td>-5</td><td>-5</td><td>-5</td><td>—</td><td>-1</td><td>-1</td></tr><tr><td>Income tax expense from continuing operations</td><td>1,156</td><td>634</td><td>527</td><td>301</td><td>322</td><td>78</td><td>225</td></tr><tr><td>Tax (benefit) expense from discontinued operations</td><td>-30</td><td>—</td><td>1</td><td>—</td><td>—</td><td>-36</td><td>—</td></tr><tr><td>Total income tax expense included in Consolidated Statements of Operations</td><td>$1,126</td><td>$634</td><td>$528</td><td>$301</td><td>$322</td><td>$42</td><td>$225</td></tr></table>

Question: What is the proportion of all Progress Energy that are greater than 10 to the total amount of Progress Energy, in 2016?