and generally represent the amounts owed by, or owed to, Exelon for the deliveries associated with the current billing cycles under the commercial agreements.
Further, Exelon has not provided or guaranteed the debt or equity support, or provided liquidity arrangements, performance guarantees or other commitments associated with these commercial agreements.
As of December 31, 2012, Exelon did have significant variable interests in and exposure to loss associated with nine VIEs for which it was not the primary beneficiary; including certain equity method investments and certain commercial agreements.
As of December 31, 2011, Exelon had a significant variable interest in and exposure to loss associated with one VIE for which they were not the primary beneficiary.
The following tables present summary information about the significant unconsolidated VIE entities for which Exelon has exposure to loss:
## Table 0 ##
(a) These items represent amounts on the unconsolidated VIE balance sheets, not on Exelon’s Consolidated Balance Sheets.
These items are included to provide information regarding the relative size of the unconsolidated VIEs.
(b) These items represent amounts on Exelon’s balance sheet related to the asset sale agreement with ZionSolutions, LLC.
The net assets pledged for Zion Station decommissioning includes gross pledged assets of $614 million and $734 million as of December 31, 2012 and December 31, 2011, respectively; offset by payables to ZionSolutions LLC of $564 million and $691 million as of December 31, 2012 and December 31, 2011, respectively.
These items are included to provide information regarding the relative size of the ZionSolutions LLC unconsolidated VIE.
See Note 13—Asset Retirement Obligations for further discussion.
Exelon assesses the risk of a loss equal to its maximum exposure to be remote and, accordingly has not recognized a liability associated with any portion of the maximum exposure to loss.
In addition, there are no agreements with, or commitments by, third parties that would affect the fair value or risk of its variable interests in these variable interest entities.
Energy Purchase and Sale Agreements.
In March 2005, Constellation, to which Generation is now a successor, closed a transaction in which Generation assumed from a counterparty two power sales contracts with previously existing VIEs.
The VIEs previously were created by the counterparty to issue debt in order to monetize the value of the original contracts to purchase and sell power.
Under the power sales contracts, Generation sells power to the VIEs which, in turn, sell that power to an electric distribution utility through 2013.
In connection with this transaction, a third party acquired the equity of the VIEs and Generation loaned that party a portion of the purchase price.
If the electric distribution utility were to default under its obligation to buy power from the VIEs, the equity holder could transfer its equity interests to Generation in lieu of repaying the loan.
In this event, Generation would have the right to seek recovery of its losses from the electric distribution utility.
As a result, Generation has concluded that consolidation is not required.
ZionSolutions.
Generation has an asset sale agreement with EnergySolutions, Inc.  and certain of its subsidiaries, including ZionSolutions, LLC (ZionSolutions), which is further discussed in Note 13— Asset Retirement Obligations.
Under this agreement, ZionSolutions can put the assets and liabilities back to Generation when decommissioning is complete.
Generation has evaluated this agreement and determined that, through the put option, it has a variable interest in ZionSolutions but is not the primary beneficiary.
As a result, Generation has concluded that consolidation is not required.
(a) Includes results for Constellation business transferred to Generation beginning on March 12, 2012, the date the merger was completed.
(b) Results of transactions with PECO and BGE are included in the Mid-Atlantic region.
(c) Results of transactions with ComEd are included in the Midwest region.
(d) Other Regions includes South, West and Canada, which are not considered individually significant.
(e) Other represents activities not allocated to a region.
See text above for a description of included activities.
Also includes amortization of intangible assets related to commodity contracts recorded at fair value at merger date of $1,098 million pre-tax for the twelve months ended December 31, 2012.
(f) Includes $487 million and $306 million of purchase power from CENG in the Mid-Atlantic and New York regions, respectively.
See Note 22 of the Combined Notes to Consolidated Financial Statements for additional information.
Generation’s supply sources by region are summarized below:
## Table 1 ##
(a) Includes results for Constellation business transferred to Generation beginning on March 12, 2012, the date the merger was completed.
(b) Includes the proportionate share of output where Generation has an undivided ownership interest in jointly-owned generating plants and does not include ownership through equity method investments (e. g.  CENG).
(c) Purchased power includes physical volumes of 9,925 GWh in the Mid-Atlantic and 9,350 GWh in New York as a result of the PPA with CENG for the year ended December 31, 2012.
(d) Excludes generation under the reliability-must-run rate schedule and generation of Brandon Shores, H. A.  Wagner, and C. P.  Crane, the generating facilities divested in Q4 as a result of the Exelon and Constellation merger.
(e) Generation from Wolf Hollow is included in purchased power through the acquisition date of August 24, 2011, and included within Fossil and Renewables subsequent to the acquisition date.
(f) Other Regions includes South, West and Canada, which are not considered individually significant.
(g) Excludes physical proprietary trading volumes of 12,958 GWh, 5,742 GWh and 3,625 GWh for the years ended December 31, 2012, 2011 and 2010 respectively.
(h) Includes sales to PECO through the competitive procurement process of 7,762 GWh, 7,041 GWh, and 42,003 GWh for the years ended December 31, 2012, 2011 and 2010 respectively.
Sales to BGE of 3,766 GWh were included for the year ended December 31, 2012.
(i) Includes sales to ComEd under the RFP procurement of 4,152 GWh, 4,731 GWh and 8,218 GWh for the years ended December 31, 2012, 2011 and 2010 respectively.
Altria Group, Inc.  and Subsidiaries Notes to Consolidated Financial Statements cases; (ii) management is unable to estimate the possible loss or range of loss that could result from an unfavorable outcome in any of the pending tobacco-related cases; and (iii) accordingly, management has not provided any amounts in the consolidated financial statements for unfavorable outcomes, if any.
Legal defense costs are expensed as incurred.
Altria Group, Inc.  and its subsidiaries have achieved substantial success in managing litigation.
Nevertheless, litigation is subject to uncertainty and significant challenges remain.
It is possible that the consolidated results of operations, cash flows or financial position of Altria Group, Inc. , or one or more of its subsidiaries, could be materially affected in a particular fiscal quarter or fiscal year by an unfavorable outcome or settlement of certain pending litigation.
Altria Group, Inc.  and each of its subsidiaries named as a defendant believe, and each has been so advised by counsel handling the respective cases, that it has valid defenses to the litigation pending against it, as well as valid bases for appeal of adverse verdicts.
Each of the companies has defended, and will continue to defend, vigorously against litigation challenges.
However, Altria Group, Inc.  and its subsidiaries may enter into settlement discussions in particular cases if they believe it is in the best interests of Altria Group, Inc.  to do soOverview of Altria Group, Inc.  and/or PM USA Tobacco-Related Litigation Types and Number of Cases: Claims related to tobacco products generally fall within the following categories: (i) smoking and health cases alleging personal injury brought on behalf of individual plaintiffs; (ii) smoking and health cases primarily alleging personal injury or seeking courtsupervised programs for ongoing medical monitoring and purporting to be brought on behalf of a class of individual plaintiffs, including cases in which the aggregated claims of a number of individual plaintiffs are to be tried in a single proceeding; (iii) health care cost recovery cases brought by governmental (both domestic and foreign) plaintiffs seeking reimbursement for health care expenditures allegedly caused by cigarette smoking and/or disgorgement of profits; (iv) class action suits alleging that the uses of the terms “Lights” and “Ultra Lights” constitute deceptive and unfair trade practices, common law or statutory fraud, unjust enrichment, breach of warranty or violations of the Racketeer Influenced and Corrupt Organizations Act (“RICO”); and (v) other tobaccorelated litigation described below.
Plaintiffs’ theories of recovery and the defenses raised in pending smoking and health, health care cost recovery and “Lights/Ultra Lights” cases are discussed below.
The table below lists the number of certain tobacco-related cases pending in the United States against PM USA and, in some instances, Altria Group, Inc.  as of December 31, 2014, December 31, 2013 and December 31, 2012.
## Table 2 ##
(1) Does not include 2,558 cases brought by flight attendants seeking compensatory damages for personal injuries allegedly caused by exposure to environmental tobacco smoke (“ETS”).
The flight attendants allege that they are members of an ETS smoking and health class action in Florida, which was settled in 1997 (Broin).
The terms of the court-approved settlement in that case allow class members to file individual lawsuits seeking compensatory damages, but prohibit them from seeking punitive damages.
Also, does not include individual smoking and health cases brought by or on behalf of plaintiffs in Florida state and federal courts following the decertification of the Engle case (discussed below in Smoking and Health Litigation - Engle Class Action).
(2) Includes as one case the 600 civil actions (of which 346 were actions against PM USA) that were to be tried in a single proceeding in West Virginia (In re: Tobacco Litigation).
The West Virginia Supreme Court of Appeals has ruled that the United States Constitution did not preclude a trial in two phases in this case.
Issues related to defendants’ conduct and whether punitive damages are permissible were tried in the first phase.
Trial in the first phase of this case began in April 2013.
In May 2013, the jury returned a verdict in favor of defendants on the claims for design defect, negligence, failure to warn, breach of warranty, and concealment and declined to find that the defendants’ conduct warranted punitive damages.
Plaintiffs prevailed on their claim that ventilated filter cigarettes should have included use instructions for the period 1964 - 1969.
The second phase, if any, will consist of individual trials to determine liability and compensatory damages on that claim only.
In August 2013, the trial court denied all post-trial motions.
The trial court entered final judgment in October 2013 and, in November 2013, plaintiffs filed their notice of appeal to the West Virginia Supreme Court of Appeals.
On November 3, 2014, the West Virginia Supreme Court of Appeals affirmed the final judgment.
Plaintiffs filed a petition for rehearing with the West Virginia Supreme Court of Appeals, which the court denied on January 8, 2015.
(3) See Health Care Cost Recovery Litigation - Federal Government’s Lawsuit below.

<table><tr><td> December 31, 2012</td><td> Commercial Agreement VIEs</td><td> Equity Method Investment VIEs</td><td> Total</td></tr><tr><td>Total assets<sup>(a)</sup></td><td>$386</td><td>$354</td><td>$740</td></tr><tr><td>Total liabilities<sup>(a)</sup></td><td>219</td><td>114</td><td>333</td></tr><tr><td>Registrants’ ownership interest<sup>(a)</sup></td><td>—</td><td>97</td><td>97</td></tr><tr><td>Other ownership interests<sup>(a)</sup></td><td>167</td><td>143</td><td>310</td></tr><tr><td>Registrants’ maximum exposure to loss:</td><td></td><td></td><td></td></tr><tr><td>Letters of credit</td><td>5</td><td>—</td><td>5</td></tr><tr><td>Carrying amount of equity method investments</td><td>—</td><td>77</td><td>77</td></tr><tr><td>Contract intangible asset</td><td>8</td><td>—</td><td>8</td></tr><tr><td>Debt and payment guarantees</td><td>—</td><td>5</td><td>5</td></tr><tr><td>Net assets pledged for Zion Station decommissioning<sup>(b)</sup></td><td>50</td><td>—</td><td>50</td></tr><tr><td> December 31, 2011</td><td> Commercial Agreement VIEs</td><td> Equity Method Investment VIEs</td><td> Total</td></tr><tr><td>Registrants’ maximum exposure to loss:</td><td></td><td></td><td></td></tr><tr><td>Net assets pledged for Zion Station decommissioning<sup>(b)</sup></td><td>43</td><td>—</td><td>43</td></tr></table>
<table><tr><td></td><td></td><td></td><td colspan="2">2012 vs. 2011</td><td></td><td colspan="2">2011 vs. 2010</td></tr><tr><td> Supply source (GWh)</td><td> 2012<sup>(a)</sup></td><td> 2011</td><td> Variance</td><td>% Change</td><td> 2010</td><td>Variance</td><td>% Change</td></tr><tr><td>Nuclear generation<sup>(b)</sup></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Mid-Atlantic</td><td>47,337</td><td>47,287</td><td>50</td><td>0.1%</td><td>47,517</td><td>-230</td><td>-0.5%</td></tr><tr><td>Midwest</td><td>92,525</td><td>92,010</td><td>515</td><td>0.6%</td><td>92,493</td><td>-483</td><td>-0.5%</td></tr><tr><td></td><td>139,862</td><td>139,297</td><td>565</td><td>0.4%</td><td>140,010</td><td>-713</td><td>-0.5%</td></tr><tr><td>Fossil and renewables<sup>(b)</sup></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Mid-Atlantic<sup>(b)(d)</sup></td><td>8,808</td><td>7,572</td><td>1,236</td><td>16.3%</td><td>9,426</td><td>-1,854</td><td>-19.7%</td></tr><tr><td>Midwest</td><td>971</td><td>596</td><td>375</td><td>62.9%</td><td>68</td><td>528</td><td>n.m.</td></tr><tr><td>New England</td><td>9,965</td><td>8</td><td>9,957</td><td>n.m.</td><td>10</td><td>-2</td><td>-20.0%</td></tr><tr><td>ERCOT<sup>(e)</sup></td><td>6,182</td><td>2,030</td><td>4,152</td><td>n.m.</td><td>1,129</td><td>901</td><td>79.8%</td></tr><tr><td>Other Regions<sup>(f)</sup></td><td>5,913</td><td>1,432</td><td>4,481</td><td>n.m.</td><td>84</td><td>1,348</td><td>n.m.</td></tr><tr><td></td><td>31,839</td><td>11,638</td><td>20,201</td><td>n.m.</td><td>10,717</td><td>921</td><td>8.6%</td></tr><tr><td>Purchased power</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Mid-Atlantic<sup>(c)</sup></td><td>20,830</td><td>2,898</td><td>17,932</td><td>n.m.</td><td>1,918</td><td>980</td><td>51.1%</td></tr><tr><td>Midwest</td><td>9,805</td><td>5,970</td><td>3,835</td><td>64.2%</td><td>7,032</td><td>-1,062</td><td>-15.1%</td></tr><tr><td>New England</td><td>9,273</td><td>—</td><td>9,273</td><td>n.m.</td><td>—</td><td>—</td><td>n.m.</td></tr><tr><td>New York<sup>(c)</sup></td><td>11,457</td><td>—</td><td>11,457</td><td>n.m.</td><td>—</td><td>—</td><td>n.m.</td></tr><tr><td>ERCOT<sup>(e)</sup></td><td>23,302</td><td>7,537</td><td>15,765</td><td>n.m.</td><td>9,494</td><td>-1,957</td><td>-20.6%</td></tr><tr><td>Other Regions<sup>(f)</sup></td><td>17,327</td><td>2,503</td><td>14,824</td><td>n.m.</td><td>2,618</td><td>-115</td><td>-4.4%</td></tr><tr><td></td><td>91,994</td><td>18,908</td><td>73,086</td><td>n.m.</td><td>21,062</td><td>-2,154</td><td>-10.2%</td></tr><tr><td>Total supply by region<sup>(g)</sup></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Mid-Atlantic<sup>(h)</sup></td><td>76,975</td><td>57,757</td><td>19,218</td><td>33.3%</td><td>58,861</td><td>-1,104</td><td>-1.9%</td></tr><tr><td>Midwest<sup>(i)</sup></td><td>103,301</td><td>98,576</td><td>4,725</td><td>4.8%</td><td>99,593</td><td>-1,017</td><td>-1.0%</td></tr><tr><td>New England</td><td>19,238</td><td>8</td><td>19,230</td><td>n.m.</td><td>10</td><td>-2</td><td>n.m.</td></tr><tr><td>New York</td><td>11,457</td><td>—</td><td>11,457</td><td>n.m.</td><td>—</td><td>—</td><td>n.m.</td></tr><tr><td>ERCOT</td><td>29,484</td><td>9,567</td><td>19,917</td><td>n.m.</td><td>10,623</td><td>-1,056</td><td>-9.9%</td></tr><tr><td>Other Regions<sup>(f)</sup></td><td>23,240</td><td>3,935</td><td>19,305</td><td>n.m.</td><td>2,702</td><td>1,233</td><td>45.6%</td></tr><tr><td>Total supply</td><td>263,695</td><td>169,843</td><td>93,852</td><td>55.3%</td><td>171,789</td><td>-1,946</td><td>-1.1%</td></tr></table>
<table><tr><td>Type of Case</td><td>Number of CasesPending as ofDecember 31, 2014</td><td>Number of CasesPending as ofDecember 31, 2013</td><td>Number of CasesPending as ofDecember 31, 2012</td></tr><tr><td>Individual Smoking and Health Cases<sup>-1</sup></td><td>67</td><td>67</td><td>77</td></tr><tr><td>Smoking and Health Class Actions and Aggregated Claims Litigation<sup>-2</sup></td><td>5</td><td>6</td><td>7</td></tr><tr><td>Health Care Cost Recovery Actions<sup>-3</sup></td><td>1</td><td>1</td><td>1</td></tr><tr><td>“Lights/Ultra Lights” Class Actions</td><td>12</td><td>15</td><td>14</td></tr></table>

Question: What is the increasing rate of Total supply between 2011 and 2012?
Answer: 0.55258