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State of Sustainability Today’s sustainable transformations become tomorrow’s traditions
2011-2012 Review
Tracy Dixon
Director, University Sustainability Office
sustainability.ncsu.edu
2011-2012 Highlights Campus Environmental Sustainability Team
Academics & Research
Community & Culture
Energy & Water
Green Development
Purchasing & Waste Reduction
Transportation
Sustainability-Related Awards & Events
• Over 50 events
• 7 Campus Awards
• Over 30 contributors to the report
How is NC State Doing?
sustainability.ncsu.edu
Winter Holiday Energy Setback Report
2012-2013
Team Roster
Project Leadership: Jack Colby, Assistant Vice Chancellor for Facilities Operations Project Facilitator: Utilities and Engineering, Energy Management Participating NC State Facilities Teams: Building Maintenance & Operations Campus Enterprises Facilities Operations Carmichael Complex Facilities and Operations Dining and Catering Operations University Athletics University Housekeeping University Housing University Sustainability Office Utilities and Engineering, District Utility Plants
Winter Holiday Energy Setback 2012–2013 Report
• Project Description – The NC State campus closes annually over the Winter Holiday, for an average duration of 10 days.
During this time, building temperature setpoints are lowered, unnecessary lights and equipment are turned off, and doors and windows are closed. The setback temperatures are 60°F to 65°F. This temperature range ensures buildings are not damaged from freezing conditions, while at the same time providing energy conservation. The setback program has been in effect since 2005.
• Business Case – By setting back buildings, NC State can save natural gas and electricity thereby saving costs and lowering
carbon emissions. During the 2012-13 Winter Holiday Energy Setback, $281,774 in energy costs were Avoided. Since the established baseline in 2004, the program has avoided more than $2.1 MM.
• Facility Upgrades – A natural gas fueled 11 megawatt Combined Heat and Power (CHP) plant was completed on campus in
2012. CHP is the simultaneous production of electricity and utilization of “waste” heat for the production of steam to heat buildings. The effects from the CHP results are lower electrical consumption and higher natural gas consumption.
• Exception Process – The program has a formal exception process that allows selected buildings and building zones to remain
at normal heat and humidity operating levels through the setback period.
• Education and Outreach – The campus community is informed about the program through email blats and routine media outlets,
such as flyers on campus digital billboards and social media.
Winter Holiday Energy Setback 2012–2013 Report
Program Overview
Winter Holiday Energy Setback 2012–2013 Report
Educational Flyer
Winter Holiday Energy Setback Calendar of Events December 2012 - January 2013
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
KEY: LIMITED
OPERATION
KEY: ENERGY SETBACK
4 READING DAY. PLANNING,
TRAINING, AND EDUCATING.
5 FINAL EXAMS
BEGIN.
6 7 8
9 10 EXEMPTION REQUESTS
DEADLINE
11 12 13 FINAL EXAMS
END
14 DORMS CLOSE.
EXEMPTION REQUEST RESULTS.
15 GRADUATION.
DORMS CLOSE FOR GRADUATING STUDENTS.
16 17 GRADES DUE.
SETBACK CLASSROOMS &
RESIDENCE HALLS.
18 19 20 21 SETBACK CAMPUS.
FINAL WALKTHROUGHS.
22 WINTER HOLIDAY BEGINS
23 24 25 26 27 28 29
30 31 1 WINTER HOLIDAY ENDS
2 3 4 SPRING ORIENTATION
5 DORMS REOPEN
6 7 CLASS BEGINS
8 9 10 11 12
Winter Holiday Energy Setback 2012–2013 Report
0
2,000,000
4,000,000
6,000,000
8,000,000
10,000,000
12,000,000
14,000,000
16,000,000
2004 2005 2006 2007 2008 2009 2010 2011 2012
Campus Gross Square Footage
Base
line
237
193 154 179 195
307 271
153 224
0
50
100
150
200
250
300
350
2004 2005 2006 2007 2008 2009 2010 2011 2012
Heating Degree Days
Base
line
Winter Holiday Energy Setback 2012–2013 Report
• Growth of NC State’s Campus – NC State is growing at a healthy rate. In 2012
alone, more than 800,000 square feet was added to the campus. Along with this growth, energy consumption naturally tends to grow at a similar rate. In order to compare energy use to prior years, energy consumption per gross square foot (GSF) is the accepted unit of measure.
• The Effect of Heating Degree Days – Heating Degree Days (HDD) are a method of
normalizing energy data for the effects of weather from one year to the next. HDD are calculated by subtracting the average daily temperature from the baseline temperature of 65°F. These values are added together for each winter holiday energy setback period. Colder temperatures equate to a higher HDD which require more energy for heating campus buildings.
– The HDD for the 2012 setback period are just 5.5% less than the baseline year, and therefore, weather is not a major factor in the normalized results this year.
0
1,000,000
2,000,000
3,000,000
4,000,000
5,000,000
6,000,000
2004 2005 2006 2007 2008 2009 2010 2011 2012
Campus Electrical Consumption (kWh)
Actual Consumption (kWh)
Normalized Consumption (kWh)
Base
line
• Actual Electricity Consumption – Actual electrical consumption, expressed
as kilowatt-hours (kWh), sharply decreased this year by 50%. The new 11 megawatt CHP Plant on campus that began generating electricity in 2012, and is a contributing factor in the observed electrical consumption decrease. However, the actions taken by the campus community to reduce energy consumption cannot be undervalued.
• Normalized Electric Consumption – Electric consumption is not as weather
dependent as natural gas consumption, but it is affected by the growing campus. Therefore, electrical consumption is normalized for campus gross square footage only. In 2012, the normalized data shows a 64% decrease in electricity consumption compared to the baseline year, and a 41% improvement over last year’s program.
Winter Holiday Energy Setback 2012–2013 Report
Base
line
• Actual Natural Gas Consumption – Actual natural gas consumption,
expressed as total British Thermal Units (BTU), increased this year by 20% compared to the baseline year. The sharp increase in natural gas consumption can largely be attributed to the 11 megawatt CHP plant that is fueled by natural gas.
• Normalized Natural Gas Consumption
– Natural gas consumption expressed as total BTU, is highly weather (temperature and humidity) dependent. It is also affected by the increased campus GSF. For these two reasons, natural gas consumption is normalized for both weather and campus growth.
Winter Holiday Energy Setback 2012–2013 Report
0
10,000
20,000
30,000
40,000
50,000
60,000
2004 2005 2006 2007 2008 2009 2010 2011 2012
Campus Natural Gas Consumption (MMBTU)
Actual Consumption (BTU)
Normalized Consumption
Base
line
Base
line
• Energy Cost Avoidance – By comparing the energy consumption to the 2004 baseline year and adding the utility (cost) component, values of
actual dollars saved are calculated. Using this approach, more than $2.1 MM in utility costs have been avoided since 2005. The natural gas fueled CHP plant that came online in 2012 resulted in higher natural gas costs compared to all previous years. This trend in natural gas consumption is expected for the foreseeable future.
Winter Holiday Energy Setback 2012–2013 Report
$223,392
$412,742 $336,762 $340,991
$151,657 $166,271
$290,838 $281,774
$0
$50,000
$100,000
$150,000
$200,000
$250,000
$300,000
$350,000
$400,000
$450,000
2005 2006 2007 2008 2009 2010 2011 2012
Energy Cost Avoidance to Base Year
• Lessons Learned – Early preparation, coordination, training, and
education is essential to program success. – The first campus announcement e-mail was flagged
as spam in some accounts. To ensure the campus community was aware of the program, a second e-mail was sent out as a “Chancellor’s Memo”. This practice should be followed again next year.
