SQL Server 2017

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CREATE TABLE mytable(
   UtilityName      VARCHAR(8) NOT NULL 
  ,StateName        VARCHAR(7) NOT NULL
  ,CountyName       VARCHAR(8) NOT NULL
  ,CityName         VARCHAR(6) NOT NULL
  ,CustomersTracked INTEGER  NOT NULL
  ,CustomersOut     INTEGER  NOT NULL
  ,RecordedDateTime VARCHAR(21) NOT NULL
);
INSERT INTO mytable(UtilityName,StateName,CountyName,CityName,CustomersTracked,CustomersOut,RecordedDateTime) VALUES ('Utility1','State1','County1','City1',1500,0,'2017-12-28 12:25:00');
INSERT INTO mytable(UtilityName,StateName,CountyName,CityName,CustomersTracked,CustomersOut,RecordedDateTime) VALUES ('Utility1','State1','County1','City1',1500,50,'2018-01-01 03:25:00');
INSERT INTO mytable(UtilityName,StateName,CountyName,CityName,CustomersTracked,CustomersOut,RecordedDateTime) VALUES ('Utility1','State1','County1','City1',1500,65,'2018-01-01 03:36:00');
INSERT INTO mytable(UtilityName,StateName,CountyName,CityName,CustomersTracked,CustomersOut,RecordedDateTime) VALUES ('Utility1','State1','County1','City1',1500,40,'2018-01-01 03:55:00');
INSERT INTO mytable(UtilityName,StateName,CountyName,CityName,CustomersTracked,CustomersOut,RecordedDateTime) VALUES ('Utility1','State1','County1','City1',1500,0,'2018-01-01 04:34:00');

5 rows affected

UtilityName	StateName	CountyName	CityName	CustomersTracked	CustomersOut	RecordedDateTime	MinutesOut
Utility1	State1	County1	City1	1500	0	2017-12-28 12:25:00	null
Utility1	State1	County1	City1	1500	50	2018-01-01 03:25:00	11
Utility1	State1	County1	City1	1500	65	2018-01-01 03:36:00	19
Utility1	State1	County1	City1	1500	40	2018-01-01 03:55:00	39
Utility1	State1	County1	City1	1500	0	2018-01-01 04:34:00	null