Campus Annual Energy Use Report

Transcription

1 Campus Annual Energy Use Report

2 Macalester College Energy Report Contents Year at a Glance... 3 Executive Summary... 3 Fuel Consumption & Cost... 4 Campus Fuel Consumption... 4 Campus Fuel Cost... 4 Electricity Consumption & Cost... 4 Campus Electrical Consumption and Demand... 4 Campus Electrical Cost... 5 Water Consumption & Cost... 5 Energy Conservation Projects & Reporting Initiatives... 6 Charts & Graphs... 7 Campus Total Energy Consumption... 7 Campus Total Utility Costs... 8 Campus Fuel Consumption Campus Fuel Cost Campus Electrical Consumption Campus Electrical Demand Campus Electrical Costs Water Consumption & Cost Data Campus Square Footage Information

3 Macalester College Energy Report Year at a Glance Utility Costs: FY FY FY Total Utility Costs $1,747,496 $1,798,437 $1,852,145 Electricity Costs $1,106,076 $1,122,669 $1,101,852 Fuel Costs $383,770 $411,953 $475,121 Water & Sewer Costs $257,650 $263,815 $275,172 Weather Normalized Energy Consumption: FY FY FY Total Energy KBTUs 141,943, ,305, ,922,563 Fuel KBTUs 100,624, ,217,429 95,624,036 Electricity KBTUs 41,318,772 40,088,061 38,298,527 Water Consumption: FY FY FY Total Water CCF 40,046 39,947 38,522 Energy Utilization Index (KBTUs/GSF/Year) Performance vs. 3% Annual Energy Reduction Goal: FY FY FY Base Year (1.7% Cum. Reduction) (6.8% Cum. Reduction) Executive Summary This report summarizes the energy and water consumed on Macalester College s campus during FY The College utilizes electricity, natural gas, and #2 fuel oil as its primary sources of energy, with each energy source providing different amounts of energy per unit but at significantly different costs. For example, the electricity consumed in FY comprised only 28% of the total energy consumed across the campus but accounted for 59% of the College s total expenditures for energy. Starting with FY , Macalester College set a goal of 3% per year reduction in its total energy consumption for the following five year period. FY was selected as the baseline period for measuring progress toward the consumption targets. In order to achieve these goals, Macalester has increased its ongoing energy conservation efforts via participation in Xcel Energy s Commercial Energy Efficiency Program, implementation of lighting efficiency and control projects, and the deployment of other new technologies. An energy manager position was also created within the Facilities Services department to assist with the implementation of energy conservation projects and to track the College s progress toward achieving the campus energy reduction targets. Progress towards achieving the energy reduction targets is monitored by tracking all of the energy sources used on campus each year and calculating the College s energy utilization index (EUI) value. The EUI value is presented in KBTUs/GSF/Year and is a commonly used value for energy use evaluations because it accommodates the use of weather normalization and also compensates for changes in the area of the campus over time. Since the base year Macalester College has reduced the EUI value for its campus from KBTU/GSF/Year to 94.6 KBTU/GSF/Year, which equates to a cumulative reduction of 6.8% vs. the desired 9% cumulative reduction target for that period. Although the reduction in electrical consumption in FY was 11.2% less than the consumption 3

4 Macalester College Energy Report in the base year, the reduction in the weather normalized amount of fuel consumed during the year was just 5%, resulting in a combined EUI value that did not meet the three year goal. Macalester College s total expenditures for electricity and fuel in FY were $1,576,973, which was approximately 3% higher than the previous fiscal year s total energy costs. Compared to FY , the cost paid per Kilowatt hour (kwh) for electricity rose by 2% and the cost per million BTU (MMBtu) of fuel rose by 5%. In addition to the expense for fuel & electricity, in FY Macalester consumed 38,522 CCF of water, at a cost of approximately $275,172. (1 CCF = 100 Cubic Feet = 748 Gallons.) Fuel Consumption & Cost Campus Fuel Consumption Approximately 98,000,000 KBTUs of natural gas and #2 fuel oil were consumed on campus during FY % of the fuel energy was used by the central heating plant and the balance was used in buildings and houses on campus for space heating, domestic water heating, and cooking applications. The Art building s kilns and forges are also a significant consumer of natural gas on campus. In addition to natural gas, approximately 19,000 gallons of #2 fuel oil were used by the central heating plant during FY due to curtailments of natural gas that were requested by Xcel Energy. (Macalester benefits from a lower price for natural gas year round due to an agreement with Xcel Energy that, at their request, the College will use fuel oil in the boiler plant instead of natural gas during periods of extremely cold weather.) The actual amount of fuel consumed in any given year can be adjusted via weather normalization calculations to allow comparison with the fuel consumption in other years. After weather normalization of the fuel consumed by the College s central boiler plant, the total fuel consumption for the campus in FY was approximately 96,000,000 KBTUs, which was 5% less than the weather normalized fuel use in the FY base year. The quantity of natural gas used for heating the houses on campus has not been weather normalized because it accounts for a relatively small percentage of the campus overall fuel consumption. Campus Fuel Cost The total cost for the natural gas and #2 fuel oil consumed on Macalester College s campus in FY was $475,121. This expenditure was 15% higher than the $411,953 spent on natural gas in FY , when no fuel oil was used. The increase in cost compared to the previous year is disproportionally higher than the increase in the amount of fuel consumed due to the higher cost per MMBtu for fuel oil compared to natural gas. Electricity Consumption & Cost Campus Electrical Consumption and Demand Macalester College s actual electrical consumption in FY was approximately 11,320,000 KWH. 87% of Macalester s total electric energy was used for the electrical loads that are served by the campus main electric meter, such as building lighting, distributed mechanical equipment, and plug loads. The College s chiller plant used about 8% of the campus total electric energy, and the remaining 5% was used in the various campus buildings and houses that have individual electric meters. Like the boiler plant, the amount of electricity used in Macalester College s central cooling plant is highly affected by seasonal weather variations and is presented in a weather normalized basis to provide a standardized method of measuring year to year progress toward the College s energy reduction goals. 4

5 Macalester College Energy Report Several components of the campus electrical energy use have not been weather normalized for this report. The amount of electricity used for lighting, distributed mechanical equipment, and building plug loads has not been normalized because it varies more with changes in the number of people on campus over the academic year than due to seasonal weather variations. After adjusting the amount of electricity consumed by the chiller plant for seasonal weather variations, the total amount of electricity consumed on campus during FY was approximately 11,225,000 KWH. The weather normalized total for FY was 11% less than the baseline period, out performing the 9% cumulative energy reduction goal for the year. In addition to the amount of electricity consumed on campus (measured in kilowatt hours or KWH), the College is also charged for the rate at which it uses electricity (demand, which is measured in kilowatts or KW). Macalester was billed for 27,334 KW in FY , which was 5% less than the amount used in the base year. Campus Electrical Cost Although the amount of electricity consumed on campus over the past three years has decreased each year, the amount spent has remained nearly constant due to increases in electric utility rates. Electrical demand charges for FY comprised 28% ($310,000) of the campus total electrical costs of $1,102,000. Electrical consumption and demand charges for Macalester College s chiller plant in FY were $155,000. Although the chiller plant s electrical consumption in FY amounted to only 8% of the electricity consumed on campus it accounted for more than 20% of the campus total electrical demand charges. Water Consumption & Cost During FY Macalester College consumed approximately 36,500 CCF of water, or approximately 27,300,000 gallons (1 CCF = 100 Cubic Feet = 748 gallons). This quantity of water would fill 27 swimming pools that are each 267 feet long by 50 feet wide to a depth of 10 feet. Depending on the amount of rain received during the growing season, approximately 20 25% of the water consumed on campus is used for irrigation of the campus vegetation and in the central chiller plant s cooling towers. After deducting the non potable consumption, the amount of water consumed for drinking, cooking, and bathing has remained fairly constant at about 30,000,000 CCF for the past three years. Macalester College s total water & sewer charges in FY were approximately $275,000, which represents 15% of the College s total expenditures for electricity, fuel, and water/sewer charges. The rate at which the College is charged for water & sewer costs has increased by 20% since the base year. 5

6 Macalester College Energy Report Energy Conservation Projects & Reporting Initiatives Energy Conservation Projects & Initiatives: Lighting Upgrade Projects: The original fluorescent & incandescent lighting fixtures in the buildings listed below were retrofitted to LED lighting technology: Campus Center Building wide retrofit Olin Rice Building wide retrofit Wallace Library Building wide retrofit Ordway Research Station Building wide retrofit Doty Hall Installation of bi level LED fixtures with integrated occupancy sensors in residence hall corridors Residence Hall Restrooms & Corridors Began campus wide installation of LED retrofit kits in compact fluorescent recessed fixtures Building Automation System Upgrades: The legacy building automation systems that control the HVAC equipment in the buildings listed below were upgraded to newer direct digital control equipment, which will provide the ability to implement energy conservation strategies that were not possible with the original equipment. Olin Rice The controls for all of the building s major HVAC equipment (air handling units, heating & cooling pumps, etc.) were upgraded. In addition, a multi year project to replace the obsolete laboratory ventilation controls was started. George Draper Dayton Hall Building wide controls retrofit Neill Hall Retrofit of the controls for all of the building s major HVAC equipment Electrical/Mechanical Projects: Upgrades were made to electrical and mechanical systems: George Draper Dayton Hall Installation of equipment and controls that will allow improved control of the heat trace tapes used to clear ice and snow from the building roof and gutters Sub metering and Energy Reporting Initiatives: Submeters Continued installation of additional submeters for monitoring electricity and steam condensate kwh360 Continued Implementation of cloud based utility bill tracking software application GRITS Continued Implementation of cloud based energy conservation project tracking software application Sustainability Dashboard Partnered with staff & students from Macalester s Sustainability office to develop an energy reporting dashboard that displays the consumption data reported by the electric and condensate submeters installed in campus buildings. Energy Star Portfolio Manager Continued use of the Energy Star Portfolio Manager energy tracking software for verification of the energy usage and savings calculations performed by Macalester staff. 6

7 Charts & Graphs Campus Total Energy Consumption Campus Combined Fuel & Electricity Consumption Actual Usage KBTUs Electricity, 38,624,052, 28% Campus Combined Fuel & ELectricity Consumption Details KBTUs Separately Metered Buildings Fuel, 11% Campus Main Electric Meter, 28% Chiller Plant Electricity, 3% Fuel, 97,760,140, 72% KBTU/GSF/Year Boiler Plant Fuel, 57% Campus Total Energy Utilization vs. 3% Annual Reduction Goal KBTUs/GSF/Year Actual EUI EUI Goal Separately Metered Buildngs Electricity, 1% 7

8 Campus Total Utility Costs Campus Utility Cost Summary Campus Utility Cost Details Water & Sewer, $275,172, 15% Water/Sewer $275,172, 15% Sep. Bldgs Fuel, $106,962, 6% Campus Main Electric Service, $867,880, 47% Electricity, $1,101,852, 59% Fuel, $475,121, 26% Heating Plant Fuel, $368,159, 20% Chiller Plant Electricity, $154,760, 8% $2,500,000 $2,000,000 $1,500,000 $1,000,000 $500,000 $238,260 $641, Campus Combined Annual Total Utility Cost $257,650 $263,815 $275,172 $383,770 $411,953 $475,121 $1,106,862 $1,106,076 $1,122,669 $1,101,852 Water/Sewer Fuel Electricity Cost per GSF $1.60 $1.40 $1.20 $1.00 $0.80 $0.60 $0.40 $0.20 $1.41 $0.17 $ Campus Combined Utility Costs per GSF $1.24 $1.27 $1.31 $0.18 $0.19 $0.19 $0.27 $0.29 $0.34 $0.78 $0.78 $0.79 $0.78 Water/Sewer Fuel Electricity Total $0 $0.00 8

9 Cost per MMBTU $35.00 $30.00 $25.00 $20.00 $15.00 $10.00 $5.00 $0.00 $25.72 $ Combined Cost for Electricity & Fuel per MMBTU $26.77 $28.01 $28.77 $12.03 $11.50 $11.86 $11.59 $4.35 $4.61 $4.86 Elect. Cost/MMBTU Fuel Cost/MMBTU Combined Cost/MMBTU $10.00 $9.00 $8.00 $7.00 $6.00 $5.00 $4.00 $3.00 $2.00 $1.00 $ Electricity, Fuel & Water Utility Rates $0.097 $0.095 $0.100 $0.091 $0.095 $0.088 $7.14 $0.090 $6.43 $6.60 $5.92 $0.085 $0.080 $6.27 $0.075 $4.35 $4.61 $4.86 $0.070 $0.065 $0.060 $0.055 $0.050 Water Cost/CCF Fuel Cost/MMBTU Elect. Cost/kWh 9

10 Campus Fuel Consumption Campus Fuel Consumption Actual Usage KBTUs Separately Metered Buildings, 16,811,600, 17% Boiler Plant Fuel, 80,948,540, 83% KBTU/GSF/Year Campus Normalized Fuel Consumption vs. 3% Annual Reduction Goal KBTUs/GSF/Year Norm. Fuel EUI Fuel EUI Goal KBTUs per Year Campus Total Fuel Consumption Boiler Plant Normalized & Separate Accounts KBTUs/Year 120,000, ,000,000 80,000,000 60,000,000 40,000,000 20,000, ,516,700 14,232,700 15,178,300 16,811,600 84,943,295 86,391,760 86,039,129 78,812,436 Sep. Accounts Boiler Plant BTUs per HDD & GSF Boiler Plant Annual Fuel Consumption per Heating Degree Days & Campus Area

11 Campus Fuel Cost $700,000 Campus Annual Fuel Cost Summary Campus Monthly Total Fuel Costs Last 3 Years $120,000 $600,000 $500,000 $400,000 $300,000 $200,000 $100,000 $0 $123,160 $106,962 $94,836 $100,420 $463,069 $313,973 $288,934 $311,533 $55,024 $0 $0 $54,187 Sep. Accts Blr Plant N. Gas Blr Plant #2 Oil Fuel Cost per Month $100,000 $80,000 $60,000 $40,000 $20,000 $ JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY 2015/ / /18 Fuel Cost per MMBTU Campus Fuel Cost per MMBTU vs. Cost per GSF $7.00 $6.27 $0.50 $0.45 $6.00 $0.45 $4.86 $0.40 $5.00 $4.61 $4.35 $0.35 $4.00 $0.34 $0.30 $3.00 $0.27 $0.29 $0.25 $0.20 $2.00 $0.15 $0.10 $1.00 $0.05 $ $0.00 Fuel Cost per GSF Cost/MMBTU Cost/GSF 11

12 Campus Electrical Consumption Separately Metered Buildings, 542,462, 5% Chiller Plant, 880,300, 8% Campus Electrical Consumption Actual Usage KWH Main Meter, 9,897,300, 87% KBTU/GSF/Year Campus Nomalized Electric Consumption vs. 3% Annual Reduction Goal KBTUs per GSF per Year / /20 Normalized Goal KWH per Year 14,000,000 12,000,000 10,000,000 Campus Total Electrical Usage Main Meter, Chiller Plant Normalized, & Sep. Accts KWH 541, , , ,462 1,012,693 1,055,802 1,009, ,894 8,000,000 Sep. Accts 6,000,000 Chiller Plant 11,058,600 10,548,300 10,206,000 9,897,300 Main Meter 4,000,000 2,000,000 0 KWH per GSF per Year Campus Main Meter Electrical Consumption per GSF

13 Campus Electrical Demand Campus Electricity Total Demand KW Separate Accounts, 1,558, 6% Chiller Plant, 5,847, 21% Main Meter, 19,929, 73% KW per Year 35,000 Campus Annual Total Demand KW per Year Main Meter, Chiller Plant, & Separate Accounts 30,000 1,415 1,491 1,498 1,558 25,000 5,661 6,049 6,288 5,847 20,000 15,000 10,000 21,717 21,625 20,748 19,929 5,000 0 Sep. Accts Chiller Plant Main Meter KW per GSF per Year Campus Main Electric Service Demand Watts per GSF per Year

14 Campus Electrical Costs Electrical Consumption & Demand Costs Consumption, $792,677, 72% Demand, $309,175, 28% Electricity Cost per Year $1,200,000 $1,000,000 $800,000 $600,000 $400,000 $200,000 $0 Campus Annual Electric Cost Summary $70,854 $69,213 $75,216 $79,212 $142,054 $160,434 $170,294 $154,760 $893,954 $876,429 $877,159 $867,880 Sep. Accts Chiller Plant Main Meter Campus Monthly Electricity Costs Last 3 Years $130,000 Campus Electricity Cost per GSF vs. Cost per KWH Electricity Cost per Month $120,000 $110,000 $100,000 $90,000 $80,000 $70,000 JUN JULY AUG SEPT OCT NOV DEC JAN FEB MAR APR MAY 2016/ / /18 Cost per GSF $0.90 $0.80 $0.70 $0.60 $0.50 $0.40 $0.30 $0.20 $0.10 $0.00 $0.78 $0.78 $0.79 $0.78 $0.088 $0.091 $0.095 $0.097 $0.145 $0.135 $0.125 $0.115 $0.105 $0.095 $0.085 $0.075 Cost per KWH Cost/GSF Cost/kWh 14

15 Cost per Year Chiller Plant Annual Elect. Cost vs. Cost per KWH $200,000 $180,000 $160,434 $170,294 $154,760 $160,000 $142,054 $140,000 $120,000 $0.18 $100,000 $80,000 $60,000 $0.16 $40,000 $0.15 $0.14 $20,000 $ $0.195 $0.185 $0.175 $0.165 $0.155 $0.145 $0.135 $0.125 Cost per KWH Cost/Year Cost/kWh $350,000 $300,000 $250,000 $200,000 $150,000 $100,000 $50,000 $0 Campus Annual Electrical Demand Charges $301,696 $313,642 $309,175 $283,689 $71,862 $80,408 $71,202 $65,541 Sep. Accts Chiller Plant Main Meter $202,290 $213,369 $215,373 $219,123 Total 15

16 Water Consumption & Cost Data 45,000 40,000 35,000 30,000 25,000 20,000 15,000 Water Consumption per Year CCF 40,277 40,046 39,947 38,522 CCF/Year Cost per Year Water/Sewer Cost per Year vs. Cost per GSF $300,000 $275,172 $0.25 $257,650 $263,815 $238,260 $250,000 $0.20 $200,000 $0.194 $0.182 $0.186 $0.169 $0.15 $150,000 $0.10 $100,000 Cost per CCF Cost/Year Cost/GSF 10,000 5,000 $50,000 $ $ $ Campus Square Footage Information Academic Buildings Total GSF, 520,253, 37% Campus Space Utilization GSF Houses & Apartments Total GSF, 35,765, 2% Residence Halls Total GSF, 366,757, 26% Admin & Support Bldgs Total GSF, 493,348, 35% 1,600,000 1,400,000 1,200,000 1,000, , , , ,000 0 Campus GSF, to Residence Halls Total GSF Admin & Support Bldgs Total GSF Academic Buildings Total GSF Houses & Apartments Total GSF (End of document) 16