Relating energy consumption to performance

Duncan East

Sustainability Manager

2008 2009 2010 2011 2012 2013 -

500,000

1,000,000

1,500,000

2,000,000

2,500,000

3,000,000

3,500,000

Total Energy use (kWh)

Electricity Heating Oil

Degree days

The number of days on which the average temperature is below a chosen baseline,

multiplied by the number of degrees by which the temperature is below the baseline

Degree days

Example – baseline temperature 15.50C

• On June 9th 2014 the average temperature over 24 hrs was 14.50C

• This is 1 degree below our chosen baseline, hence the number of degree days for that day is 1 (day) x 1 (degree) = 1 degree day (DD)

• On January 11th, 2010 the average temperature over 24 hrs was -4.50C

• This is 20 degrees below our chosen baseline, hence the number of degree days for that day is 1 (day) x 20 (degrees) = 20 degree day (DD)

• Do this for every day of the month or year and you have a measure of how much heating you are likely to have needed

2008 2009 2010 2011 2012 2013 -

500,000

1,000,000

1,500,000

2,000,000

2,500,000

3,000,000

3,500,000

0

500

1000

1500

2000

2500

3000

Total Energy use (kWh)

Electricity Heating Oil Degree days

2008 2009 2010 2011 2012 2013 -

500,000

1,000,000

1,500,000

2,000,000

2,500,000

3,000,000

3,500,000

0

500

1000

1500

2000

2500

3000

Total Energy use (kWh)

Electricity Heating Oil Degree days Total energy / DD

2008 2009 2010 2011 2012 20130

10

20

30

40

50

60

70

Okapi kWh / degree day

2008 2009 2010 2011 2012 20130

10

20

30

40

50

60

70

Giraffe kWh / degree day

Jan-

12

Feb-1

2

Mar

-12

Apr-1

2

May

-12

Jun-

12

Jul-1

2

Aug-1

2

Sep-1

2

Oct-1

2

Nov-1

2

Dec-1

2

Jan-

13

Feb-1

3

Mar

-13

Apr-1

3

May

-13

Jun-

13

Jul-1

3

Aug-1

3

Sep-1

3

Oct-1

3

Nov-1

3

Dec-1

3

Jan-

14

Feb-1

4

Mar

-14

Apr-1

4

May

-14

Jun-

14

Jul-1

4

Aug-1

4

Sep-1

40

5000

10000

15000

20000

25000

Cafe Graze

Electricity consumption

Jan-

12

Feb-1

2

Mar

-12

Apr-1

2

May

-12

Jun-

12

Jul-1

2

Aug-1

2

Sep-1

2

Oct-1

2

Nov-1

2

Dec-1

2

Jan-

13

Feb-1

3

Mar

-13

Apr-1

3

May

-13

Jun-

13

Jul-1

3

Aug-1

3

Sep-1

3

Oct-1

3

Nov-1

3

Dec-1

3

Jan-

14

Feb-1

4

Mar

-14

Apr-1

4

May

-14

Jun-

14

Jul-1

4

Aug-1

4

Sep-1

40

5000

10000

15000

20000

25000

0

50

100

150

200

250

300

350

400

450

Cafe Graze

Electricity consumption Degree days

Jan-

12

Feb-1

2

Mar

-12

Apr-1

2

May

-12

Jun-

12

Jul-1

2

Aug-1

2

Sep-1

2

Oct-1

2

Nov-1

2

Dec-1

2

Jan-

13

Feb-1

3

Mar

-13

Apr-1

3

May

-13

Jun-

13

Jul-1

3

Aug-1

3

Sep-1

3

Oct-1

3

Nov-1

3

Dec-1

3

Jan-

14

Feb-1

4

Mar

-14

Apr-1

4

May

-14

Jun-

14

Jul-1

4

Aug-1

4

Sep-1

40

5000

10000

15000

20000

25000

0

2000

4000

6000

8000

10000

12000

14000

16000

18000Cafe Graze

Electricity consumption Transactions

Jan-

12

Feb-1

2

Mar

-12

Apr-1

2

May

-12

Jun-

12

Jul-1

2

Aug-1

2

Sep-1

2

Oct-1

2

Nov-1

2

Dec-1

2

Jan-

13

Feb-1

3

Mar

-13

Apr-1

3

May

-13

Jun-

13

Jul-1

3

Aug-1

3

Sep-1

3

Oct-1

3

Nov-1

3

Dec-1

3

Jan-

14

Feb-1

4

Mar

-14

Apr-1

4

May

-14

Jun-

14

Jul-1

4

Aug-1

4

Sep-1

40

5000

10000

15000

20000

25000

0

50

100

150

200

250

300

350

400

450

Cafe Graze

Electricity kWh / 100 transactions

Jan-

12

Feb-1

2

Mar

-12

Apr-1

2

May

-12

Jun-

12

Jul-1

2

Aug-1

2

Sep-1

2

Oct-1

2

Nov-1

2

Dec-1

2

Jan-

13

Feb-1

3

Mar

-13

Apr-1

3

May

-13

Jun-

13

Jul-1

3

Aug-1

3

Sep-1

3

Oct-1

3

Nov-1

3

Dec-1

3

Jan-

14

Feb-1

4

Mar

-14

Apr-1

4

May

-14

Jun-

14

Jul-1

4

Aug-1

4

Sep-1

40

5000

10000

15000

20000

25000

0

50

100

150

200

250

300

350

400

450

Cafe Graze

Electricity kWh / 100 transactions Linear (kWh / 100 transactions)

What is your functional unit?

Don’t loose sight of the bottom line

Thank you

Any Questions?