for further information about the electric reportable segment , see “ business — our business — electric ” in item 1 of part i of this report . the natural gas reportable segment includes natural gas distribution services that are subject to rate regulation in centerpoint energy 's and cerc 's service territories , as well as home appliance maintenance and repair services to customers in minnesota and home repair protection plans to natural gas customers in texas and louisiana through a third party . for further information about the natural gas reportable segment , see “ business — our business — natural gas ” in item 1 of part i of this report . the midstream investments reportable segment includes centerpoint energy 's equity investment in enable and is dependent upon the results of enable , which are driven primarily by the volume of natural gas , ngls and crude oil that enable gathers , processes and transports across its systems and other factors as discussed below under “ — factors influencing midstream investments . ” on february 16 , 2021 , enable entered into the enable merger agreement . at the closing of the transactions contemplated by the enable merger agreement , if and when it occurs , energy transfer will acquire all of enable 's outstanding equity interests , including all enable common units and enable series a preferred units held by centerpoint energy , and in return centerpoint energy will receive energy transfer common units and energy transfer series g preferred units . for further information about the midstream investments reportable segment , see “ business — our business — midstream investments ” in item 1 of part i of this report . for further information on the enable merger , see note 22 to the consolidated financial statements . centerpoint energy 's corporate and other includes office buildings and other real estate used for business operations , energy performance contracting and sustainable infrastructure services and other corporate support operations . executive summary we expect our and enable 's businesses to continue to be affected by the key factors and trends discussed below . our expectations are based on assumptions made by us and information currently available to us . to the extent our underlying assumptions about , or interpretations of , available information prove to be incorrect , our actual results may vary materially from our expected results . factors influencing our businesses and industry trends we are an energy delivery company . the majority of our revenues are generated from the transmission and delivery of electricity and the sale of natural gas by our subsidiaries . on february 1 , 2019 , we acquired vectren for approximately $ 6 billion in cash . through its subsidiaries , vectren 's operations consist of utility and non-utility businesses . the utility operations include three public utilities , indiana gas , sigeco and vedo , which , in the aggregate , provide natural gas distribution and transportation services to nearly 67 % of indiana and about 20 % of ohio and electric transmission and distribution services to southwestern indiana , including power generating and wholesale power operations . in total , these utility operations supply natural gas and electricity to over one million customers in indiana and ohio . the non-utility operations included esg and infrastructure services . esg provides energy services through performance-based energy contracting operations and sustainable infrastructure services , such as renewables , distributed generation and combined heat and power projects . esg assists schools , hospitals , governmental facilities and other private institutions with reducing energy and maintenance costs by upgrading their facilities with energy-efficient equipment . esg operates throughout the united states . infrastructure services , through its wholly-owned subsidiaries , provided underground pipeline and repair services to many utilities , including our utilities , as well as other industries . concurrent with the completion of the merger in 2019 , we added two new reportable segments , indiana electric integrated and infrastructure services . on february 3 , 2020 , centerpoint energy , through its subsidiary vusi , entered into the securities purchase agreement to sell the infrastructure services disposal group . the transaction closed on april 9 , 2020. for further information , see note 4 to the consolidated financial statements . during the fourth quarter of 2020 , centerpoint energy 's codm requested that the financial information for the electric businesses be presented on an aggregated basis for review , resulting in one electric reportable segment , comprised of houston electric and indiana electric . see note 18 for further changes on reportable segments during 2020. to assess our financial performance , our management primarily monitors net income and cash flows , among other things , from our reportable segments . within these broader financial measures , we monitor margins , interest expense , capital spending and working capital requirements . in addition to these financial measures , we also monitor a number of variables that management considers important to our reportable segments , including the number of customers , throughput , use per customer , 45 commodity prices and heating and cooling degree days . from an operational standpoint , we monitor operation and maintenance expense , safety factors , system reliability and customer satisfaction to gauge our performance . the nature of our businesses requires significant amounts of capital investment , and we rely on internally generated cash , borrowings under our credit facilities , proceeds from commercial paper and issuances of debt and equity in the capital markets to satisfy these capital needs . with respect to cerc , we intend to use proceeds from any potential asset sales , including the potential dispositions of our natural gas businesses in arkansas and oklahoma , to satisfy a portion of its capital needs . we strive to maintain investment grade ratings for our securities to access the capital markets on terms we consider reasonable . story_separator_special_tag for example , since mid-march 2020 , we have had to restrict access to certain office locations around the united states . however , as of the date of this form 10-k , we have increased the permitted occupancy of certain of our offices and facilities . the rest of our office-based personnel continue to be productive through alternate work arrangements , leveraging a strong technology platform to support our employees working remotely to perform their duties or directly from their vehicles to serve our customers . where we must maintain a presence in the field , we have adjusted our operational protocols to minimize exposure and risk to our field personnel , customers and the communities we serve , including , among other things , modifying our work schedules and reporting locations , potentially delaying certain work types as appropriate , such as maintenance and capital projects , and adjusting project scope and scale to adhere to safety protocols , while continuing to maintain the work activities necessary for safe and reliable service to our customers with increased safety precautions . while certain of our personnel have been , and may continue to be , quarantined , our operations and corporate functions have not been adversely affected to date . certain of our natural gas service territories were impacted by hurricane laura in august 2020 , as well as hurricanes sally , delta and zeta in october 2020. while our natural gas field personnel assessed and stabilized our impacted natural gas facilities , our electric operations mutual assistance crews from texas and indiana worked safely to support the storm restoration efforts of other impacted utilities . despite covid-19 conditions , neither our personnel nor our facilities experienced significant performance or operational impacts from hurricanes laura , sally , delta and zeta . our first priority in our response to this pandemic has been the health and safety of our employees , our customers and other business counterparties . because we provide a critical service to our customers , it is paramount that we keep our employees who operate our business safe and informed , and we have taken and are updating precautions for that purpose . we have implemented preventative measures and developed corporate and regional response plans to minimize unnecessary risk of exposure and prevent infection , while supporting our customers ' operations under the circumstances . when an employee tests positive for covid-19 , we investigate appropriately and take action to identify and notify potentially exposed individuals , coordinate testing and clean work locations , among other precautionary measures . if our employees feel sick or are awaiting covid-19 test results , they do not report to their respective work locations to protect the health and safety of other employees . in addition , we have assessed and updated our existing business continuity plans for each of our business units in the context of this pandemic . we have a corporate response planning team who assesses risks to our business , including for health , safety and environmental matters and personnel issues , and addresses various impacts of the situation , as they have developed . throughout the year , this corporate response planning team has provided periodic updates on covid-19 to the board of directors , which has responsibility for , and is actively involved in , the oversight of risks that could impact centerpoint energy . we also have modified certain business practices ( including those related to employee travel , employee work locations and participation in meetings , events and conferences ) to conform to government restrictions and best practices encouraged by the centers for disease control and prevention , the world health organization and other governmental and regulatory authorities . we are continuing to address concerns to protect the health and safety of our employees and those of our customers and other business counterparties , and this includes changes to comply with health-related guidelines as they are modified and supplemented . we are continuing to work with our suppliers on any potential impacts to our supply chain , including identifying any negative impacts to material supplies , working to mitigate them and pre-planning for longer-term emergency response protocols . since march 2020 , we have not experienced significant disruptions or challenges with respect to our supply chain from the covid-19 pandemic as a result of the aforementioned efforts with our core vendors and suppliers . this is a continuously evolving situation and could lead to further disruption of economic activity in our markets ; we will continue to monitor developments affecting our workforce , our customers and our suppliers and take additional precautions as we believe are warranted . the extended slowdown of economic growth , decreased demand for commodities and material changes in governmental or regulatory policy in the united states has resulted in , and could continue to result in , lower growth , including , in certain instances , customer growth , and reduced demand for and usage of electricity and natural gas in our service territories as customer facilities continue to close or remain closed . while residential electric usage has increased as individuals continue to stay at home or work remotely , our business has experienced reduced demand and usage among our electric and natural gas commercial and industrial customers as well as a decrease in revenues from disconnections and reconnections due to the disconnect moratoriums across our service territories due to covid-19 , which have either expired or may expire during the 49 second quarter of 2021 in certain of the registrants ' service territories . certain aspects of houston electric 's rate design could mitigate the negative impact of reduced demand among commercial and industrial users . the ability of our customers , contractors and suppliers to meet their obligations to us , including payment obligations , has also been negatively impacted under the current economic conditions . for houston electric , we are following puct

houston electric senior secured debt a2 stable a stable a stable cerc cerc corp. senior unsecured debt a3 stable bbb+ stable a- stable ( 1 ) a moody 's rating outlook is an opinion regarding the likely direction of an issuer 's rating over the medium term . ( 2 ) an s & p outlook assesses the potential direction of a long-term credit rating over the intermediate to longer term . ( 3 ) a fitch rating outlook indicates the direction a rating is likely to move over a one- to two-year period . the registrants can not assure that the ratings set forth above will remain in effect for any given period of time or that one or more of these ratings will not be lowered or withdrawn entirely by a rating agency . the registrants note that these credit ratings are included for informational purposes and are not recommendations to buy , sell or hold the registrants ' securities and may be revised or withdrawn at any time by the rating agency . each rating should be evaluated independently of any other rating . any future reduction or withdrawal of one or more of the registrants ' credit ratings could have a material adverse impact on the registrants ' ability to obtain short- and long-term financing , the cost of such financings and the execution of the registrants ' commercial strategies . a decline in credit ratings could increase borrowing costs under the registrants ' revolving credit facilities . if the registrants ' credit ratings had been downgraded one notch by s & p and moody 's from the ratings that existed as of december 31 , 2020 , the impact on the borrowing costs under the four revolving credit facilities would have been insignificant . a decline in credit ratings would also increase the interest rate on long-term debt to be issued in the capital markets and could negatively impact the registrants ' ability to complete capital market transactions and to access the commercial paper market . additionally , a decline in credit ratings could increase cash collateral requirements and reduce earnings of centerpoint energy 's and cerc 's natural gas reportable segments .


 Write a concise suspicious activity report of the following text delimited by triple backquotes. Return your response as a formal report which covers the key points highlighting the location,dates,entity names and account holder information in chronological order of the text.
     ```houston electric senior secured debt a2 stable a stable a stable cerc cerc corp. senior unsecured debt a3 stable bbb+ stable a- stable ( 1 ) a moody 's rating outlook is an opinion regarding the likely direction of an issuer 's rating over the medium term . ( 2 ) an s & p outlook assesses the potential direction of a long-term credit rating over the intermediate to longer term . ( 3 ) a fitch rating outlook indicates the direction a rating is likely to move over a one- to two-year period . the registrants can not assure that the ratings set forth above will remain in effect for any given period of time or that one or more of these ratings will not be lowered or withdrawn entirely by a rating agency . the registrants note that these credit ratings are included for informational purposes and are not recommendations to buy , sell or hold the registrants ' securities and may be revised or withdrawn at any time by the rating agency . each rating should be evaluated independently of any other rating . any future reduction or withdrawal of one or more of the registrants ' credit ratings could have a material adverse impact on the registrants ' ability to obtain short- and long-term financing , the cost of such financings and the execution of the registrants ' commercial strategies . a decline in credit ratings could increase borrowing costs under the registrants ' revolving credit facilities . if the registrants ' credit ratings had been downgraded one notch by s & p and moody 's from the ratings that existed as of december 31 , 2020 , the impact on the borrowing costs under the four revolving credit facilities would have been insignificant . a decline in credit ratings would also increase the interest rate on long-term debt to be issued in the capital markets and could negatively impact the registrants ' ability to complete capital market transactions and to access the commercial paper market . additionally , a decline in credit ratings could increase cash collateral requirements and reduce earnings of centerpoint energy 's and cerc 's natural gas reportable segments .
```    
 Suspicious Activity Report : for further information about the electric reportable segment , see “ business — our business — electric ” in item 1 of part i of this report . the natural gas reportable segment includes natural gas distribution services that are subject to rate regulation in centerpoint energy 's and cerc 's service territories , as well as home appliance maintenance and repair services to customers in minnesota and home repair protection plans to natural gas customers in texas and louisiana through a third party . for further information about the natural gas reportable segment , see “ business — our business — natural gas ” in item 1 of part i of this report . the midstream investments reportable segment includes centerpoint energy 's equity investment in enable and is dependent upon the results of enable , which are driven primarily by the volume of natural gas , ngls and crude oil that enable gathers , processes and transports across its systems and other factors as discussed below under “ — factors influencing midstream investments . ” on february 16 , 2021 , enable entered into the enable merger agreement . at the closing of the transactions contemplated by the enable merger agreement , if and when it occurs , energy transfer will acquire all of enable 's outstanding equity interests , including all enable common units and enable series a preferred units held by centerpoint energy , and in return centerpoint energy will receive energy transfer common units and energy transfer series g preferred units . for further information about the midstream investments reportable segment , see “ business — our business — midstream investments ” in item 1 of part i of this report . for further information on the enable merger , see note 22 to the consolidated financial statements . centerpoint energy 's corporate and other includes office buildings and other real estate used for business operations , energy performance contracting and sustainable infrastructure services and other corporate support operations . executive summary we expect our and enable 's businesses to continue to be affected by the key factors and trends discussed below . our expectations are based on assumptions made by us and information currently available to us . to the extent our underlying assumptions about , or interpretations of , available information prove to be incorrect , our actual results may vary materially from our expected results . factors influencing our businesses and industry trends we are an energy delivery company . the majority of our revenues are generated from the transmission and delivery of electricity and the sale of natural gas by our subsidiaries . on february 1 , 2019 , we acquired vectren for approximately $ 6 billion in cash . through its subsidiaries , vectren 's operations consist of utility and non-utility businesses . the utility operations include three public utilities , indiana gas , sigeco and vedo , which , in the aggregate , provide natural gas distribution and transportation services to nearly 67 % of indiana and about 20 % of ohio and electric transmission and distribution services to southwestern indiana , including power generating and wholesale power operations . in total , these utility operations supply natural gas and electricity to over one million customers in indiana and ohio . the non-utility operations included esg and infrastructure services . esg provides energy services through performance-based energy contracting operations and sustainable infrastructure services , such as renewables , distributed generation and combined heat and power projects . esg assists schools , hospitals , governmental facilities and other private institutions with reducing energy and maintenance costs by upgrading their facilities with energy-efficient equipment . esg operates throughout the united states . infrastructure services , through its wholly-owned subsidiaries , provided underground pipeline and repair services to many utilities , including our utilities , as well as other industries . concurrent with the completion of the merger in 2019 , we added two new reportable segments , indiana electric integrated and infrastructure services . on february 3 , 2020 , centerpoint energy , through its subsidiary vusi , entered into the securities purchase agreement to sell the infrastructure services disposal group . the transaction closed on april 9 , 2020. for further information , see note 4 to the consolidated financial statements . during the fourth quarter of 2020 , centerpoint energy 's codm requested that the financial information for the electric businesses be presented on an aggregated basis for review , resulting in one electric reportable segment , comprised of houston electric and indiana electric . see note 18 for further changes on reportable segments during 2020. to assess our financial performance , our management primarily monitors net income and cash flows , among other things , from our reportable segments . within these broader financial measures , we monitor margins , interest expense , capital spending and working capital requirements . in addition to these financial measures , we also monitor a number of variables that management considers important to our reportable segments , including the number of customers , throughput , use per customer , 45 commodity prices and heating and cooling degree days . from an operational standpoint , we monitor operation and maintenance expense , safety factors , system reliability and customer satisfaction to gauge our performance . the nature of our businesses requires significant amounts of capital investment , and we rely on internally generated cash , borrowings under our credit facilities , proceeds from commercial paper and issuances of debt and equity in the capital markets to satisfy these capital needs . with respect to cerc , we intend to use proceeds from any potential asset sales , including the potential dispositions of our natural gas businesses in arkansas and oklahoma , to satisfy a portion of its capital needs . we strive to maintain investment grade ratings for our securities to access the capital markets on terms we consider reasonable . story_separator_special_tag for example , since mid-march 2020 , we have had to restrict access to certain office locations around the united states . however , as of the date of this form 10-k , we have increased the permitted occupancy of certain of our offices and facilities . the rest of our office-based personnel continue to be productive through alternate work arrangements , leveraging a strong technology platform to support our employees working remotely to perform their duties or directly from their vehicles to serve our customers . where we must maintain a presence in the field , we have adjusted our operational protocols to minimize exposure and risk to our field personnel , customers and the communities we serve , including , among other things , modifying our work schedules and reporting locations , potentially delaying certain work types as appropriate , such as maintenance and capital projects , and adjusting project scope and scale to adhere to safety protocols , while continuing to maintain the work activities necessary for safe and reliable service to our customers with increased safety precautions . while certain of our personnel have been , and may continue to be , quarantined , our operations and corporate functions have not been adversely affected to date . certain of our natural gas service territories were impacted by hurricane laura in august 2020 , as well as hurricanes sally , delta and zeta in october 2020. while our natural gas field personnel assessed and stabilized our impacted natural gas facilities , our electric operations mutual assistance crews from texas and indiana worked safely to support the storm restoration efforts of other impacted utilities . despite covid-19 conditions , neither our personnel nor our facilities experienced significant performance or operational impacts from hurricanes laura , sally , delta and zeta . our first priority in our response to this pandemic has been the health and safety of our employees , our customers and other business counterparties . because we provide a critical service to our customers , it is paramount that we keep our employees who operate our business safe and informed , and we have taken and are updating precautions for that purpose . we have implemented preventative measures and developed corporate and regional response plans to minimize unnecessary risk of exposure and prevent infection , while supporting our customers ' operations under the circumstances . when an employee tests positive for covid-19 , we investigate appropriately and take action to identify and notify potentially exposed individuals , coordinate testing and clean work locations , among other precautionary measures . if our employees feel sick or are awaiting covid-19 test results , they do not report to their respective work locations to protect the health and safety of other employees . in addition , we have assessed and updated our existing business continuity plans for each of our business units in the context of this pandemic . we have a corporate response planning team who assesses risks to our business , including for health , safety and environmental matters and personnel issues , and addresses various impacts of the situation , as they have developed . throughout the year , this corporate response planning team has provided periodic updates on covid-19 to the board of directors , which has responsibility for , and is actively involved in , the oversight of risks that could impact centerpoint energy . we also have modified certain business practices ( including those related to employee travel , employee work locations and participation in meetings , events and conferences ) to conform to government restrictions and best practices encouraged by the centers for disease control and prevention , the world health organization and other governmental and regulatory authorities . we are continuing to address concerns to protect the health and safety of our employees and those of our customers and other business counterparties , and this includes changes to comply with health-related guidelines as they are modified and supplemented . we are continuing to work with our suppliers on any potential impacts to our supply chain , including identifying any negative impacts to material supplies , working to mitigate them and pre-planning for longer-term emergency response protocols . since march 2020 , we have not experienced significant disruptions or challenges with respect to our supply chain from the covid-19 pandemic as a result of the aforementioned efforts with our core vendors and suppliers . this is a continuously evolving situation and could lead to further disruption of economic activity in our markets ; we will continue to monitor developments affecting our workforce , our customers and our suppliers and take additional precautions as we believe are warranted . the extended slowdown of economic growth , decreased demand for commodities and material changes in governmental or regulatory policy in the united states has resulted in , and could continue to result in , lower growth , including , in certain instances , customer growth , and reduced demand for and usage of electricity and natural gas in our service territories as customer facilities continue to close or remain closed . while residential electric usage has increased as individuals continue to stay at home or work remotely , our business has experienced reduced demand and usage among our electric and natural gas commercial and industrial customers as well as a decrease in revenues from disconnections and reconnections due to the disconnect moratoriums across our service territories due to covid-19 , which have either expired or may expire during the 49 second quarter of 2021 in certain of the registrants ' service territories . certain aspects of houston electric 's rate design could mitigate the negative impact of reduced demand among commercial and industrial users . the ability of our customers , contractors and suppliers to meet their obligations to us , including payment obligations , has also been negatively impacted under the current economic conditions . for houston electric , we are following puct

