Title
Memorandum from Billy Mayo, a commissioner of the Florida Public Service Commission, with attached analysis on energy consumption and Daylight Saving Time, January 28, 1974
Subject
Daylight saving
Energy policy
Energy conservation
Description
A memorandum from Commissioner Billy Mayo of the Florida Public Service Commission, dated January 28, 1974 to Governor Askew, Cabinet members, and the Florida Senate President and Speaker of the House with attached report about energy consumption during Daylight Saving Time. In Mayo's opinion, Daylight Saving contributed no significant saving of energy.
Creator
Mayo, Billy (William Taylor), 1917-1996
Florida Public Service Commission
Source
State Archives of Florida, Collection M90-18
Identifier
m90-18_b07_f02_x01
Coverage
Late 20th-Century Florida (1968-2000)
Transcript
FLORIDA PUBLIC SERVICE COMMISSION
COMMISSIONERS:
BILL BEVIS, CHAIRMAN
WILLAIM T. MAYO
MRS. PAULA F. HAWKINS
700 SOUTH ADAMS STREET
TALLAHASSEE 32304
TELEPHONE 904-488-1001
MEMORANDUM
January 28, 1974
TO : Governor Reubin O'D Askew
Secretary of State Richard Stone
Attorney General Robert Shevin
Comptroller Fred O. Dickinson, Jr.
Commissioner Thomas D. O'Malley
Commissioner Doyle Conner
Commissioner Floyd T. Christian
House Speaker Terrell Sessums
Senate President Mallory Horne
FROM: Commissioner William T. "Billy" Mayo
Attached are charts and an analysis prepared by the Engineering
Department of the Public Service Commission which show the effect of Daylight Saving Time on energy consumption in Florida.
In my judgment, there has been no significant saving of electrical energy since DST was instituted. What changes have occurred have been so slight that they could be due to various factors; i.e., voluntary conservation of energy, a decrease in the number of tourists, and unseasonably warm weather.
I am presenting this information to you in view of recent developments indicating that the matter of Daylight Saving time may be reconsidered.
I believe the facts are that Daylight Saving Time is not having the desired effect of conserving any significant amount of energy, if any at all. Therefore, in view of the many serious problems it has caused its continuance is not justified.
Attachments
The theory of shifting of daylight saving time is to reduce the peak evening demand which necessitates the use of less efficient peaking units. This strategy was implemented January 6, 1974. A reduction in customers consumption of electrical energy was not expected to be significant.
A negligible reduction in peak demand was observed for Florida Power and Light Company and Florida Power Corporation when Wednesday, January 2, 1974 was compared to Wednesday, January 9, 1974. Energy consumption actually increased on January 9, compared to the same day of the previous week.
Customers of Tampa Electric Company actually consumed more electrical energy after going to daylight saving time and had a higher peak demand.
Results from Gulf Power Company show improvement, but customer demands have been low during all hours of the day when compared to the hourly load of January 2, 1974.
Lower efficiency generating units are generally not used during the winter months in Florida and hence any success at peak shaving will produce only negligible savings attributable to system generating efficiencies. The evening peaks -in the warm months already occurs in the daylight hours and subsequent changes in the time are not recommended.
A comparison of Florida Power and Light Company's territorial consumption shows that on January 9, 1973, approximately 1.514 million customers consumed 82,432 kilowatt hours of electrical energy or 54 kilowatt hours per customer. A year later after the switch to daylight a Saving time 1.635 million customers consumed an average of 52 kilowatt hours per customer or 3.9 percent less. The temperature extremes were 74 to 65 a year ago and 78 to 73 this year.
However, it cannot be concluded that the savings of 2 kilowatt hours -per customer is attributable to daylight saving time. For the month of December 1972, overall consumption per customer was 1,529) kilowatt hours while December 1973 consumption was 1,504 kilowatt hours per customer. Since standard time was in effect for both December 1973 and 1972, it appears reasonable to attribute at least half of the percentage reduction in consumption to energy conservation. Some portion of the reduction in consumption is surely attributable to public awareness of the recent diversions of residual oil to New England this year. The effect of a decline in the economy, if any, this year to date is unknown.
In view of the above considerations, the shift of daylight Saving time is producing only negligible energy savings, if any.
JDJ/cd
FLORIDA POWER CORPORATION
JAN 2 35,008 MWH STANDARD TIME
JAN 9 35,109 MWH DAYLIGHT SAVING TIME
JAN 16 35, 121 MWH [Daylight Saving Time]
JAN 23 35, 757 MWH [Daylight Saving Time]
MEGAWATT-HOUR CONUMPTION
FLORIDA POWER AND LIGHT COMPANY
JAN 2 83, 982 MWH STANDARD TIME
JAN 9 84,631 MWH DAYLIGHT SAVING TIME
JAN 16 82,350 MWH [Daylight Saving Time]
JAN 23 83,730 MWH [Daylight Saving Time]
MEGAWATT-HOUR CONSUMPTION
GULF POWER COMPANY
JAN 2 11,581 MWH STANDARD TIME
JAN 9 10,623 MWH DAYLIGHT SAVING TIME
JAN 16 10,695 MWH [Daylight Saving Time]
JAN 23 10, 773 MWH [Daylight Saving Time]
MEGAWATT-HOUR CONSUMPTION
TAMPA ELECTRIC COMPANY
JAN 2 19,856 MWH STANDARD TIME
JAN 9 20,841 MWH DAYLIGHT SAVING TIME
JAN 16 19,812 MWH [Daylight Saving Time]
JAN 23 21,274 MWH [Daylight Saving Time]
MEGAWATT-HOUR CONSUMPTION
[Graph depicting megawatt usage per hour for Florida Power and Light Company]
[Graph depicting megawatt usage per hour for Florida Power Corporation]
[Graph depicting megawatt usage per hour for Gulf Power Company]
[Graph depicting megawatt usage per hour for Tampa Electric Company]
[Chart entitled “KWH Sales and Customer Data Month December, 1973” for the Florida Power and Light Company]
FLORIDA POWER AND LIGHT COMPANY
JAN 9 1973 82, 432 MWH STANDARD TIME
1,514,000 CUSTOMERS
TEMPERATURE: MAX 74 MIN 65 (MIAMI)
JAN 9 1974 84,631 MWH DAYLIGHT SAVING TIME
1,635,000 CUSTOMERS
TEMPERATURE: MAX 78 MIN 73
JANUARY 9, 1973-74 MEGAWATT-HOUR CONSUMPTION AND CUSTOMER GROWTH
FLORIDA POWER AND LIGHT COMPANY
(MEGAWATT-HOUR CONSUMPTION)
|
|
1973
|
|
1974
|
|
|
|
MWH
|
Temperature
|
MWH
|
Temperature
|
|
January 2
|
85,197
|
79 – 73
|
83,982
|
78 – 75
|
|
January 9
|
82,432
|
74 – 65
|
84,631
|
78 – 73
|
|
January 16
|
86,171
|
72 – 56
|
82, 350
|
78 – 69
|
|
January 23
|
87,390
|
79 – 73
|
83,730
|
79 - 71
|
STANDARD TIME
DAYLIGHT SAVING TIME
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