This document outlines the two higher level metrics utilized for tracking program progress:

Long-term program progress towards the President's Sustainability Steering Committee's 2020 goal of 20% EUI reduction over 2009 ("macro level" program tracking).
Annual and year-to-date progress to evaluate and demonstrate continued demand side reductions through ongoing initiatives ("micro level" program tracking).

Long-term (macro)

This metric will evaluate progress towards the 2020 goal of 20% energy reduction within buildings. For the scope of EWC, only E&G will be considered. Due to incomplete and changing meter coverage in E&G buildings between 2009 and 2012, energy consumption will be defined as total UEM energy to campus minus the metered energy to Auxiliaries.
The President's Sustainability Steering Committee's Natural Resource Management and Conservation Plan (adopted February 2011, amended April 2012), states:
The University of Texas at Austin will reduce energy consumption at the building level by an average of 20% per square foot per degree-day by August 31, 2020 using 2009 as the base year.
The three measured components of this metric are: energy consumption, square footage, and degree-days. Years are assumed Fiscal Year (September 1^st to August 31^st).

Energy Consumption

Energy consumption includes the total site energy consumption of chilled water, steam, and electricity. Consumption of each utility is summed together after being converted to MMBTU as follows:

Chilled Water ton-hour = 12,000 BTU [defined]
Steam pound = 1216 BTU [per UEM]
Electricity kilowatt-hour = 3413 BTU [defined]

EWC's scope of impact is limited primarily to E&G buildings on the UT Austin main campus; therefore EWC's evaluation of this goal will only include E&G buildings on the main campus. Due to the changes in available E&G metering between 2009 and 2020, the E&G consumption of each utility will be provided by Department of Utilities & Energy Management (UEM), measured as follows:
(Utility to Campus Distribution) – (Utility Billed to Auxiliary space) = (Utility consumed by E&G space)
Note: This method will exaggerate E&G space consumption by including distribution losses and any unaccounted energy, such as outdoor lighting, tunnel sump pumps and lighting, etc; however, it is the most inclusive method for measuring total E&G consumption in 2009 and subsequent years.

Square Footage

Yearly square footage will be pulled from the Texas Higher Education Coordinating Board's Facilities Inventory for UT Austin available at:
https://www1.thecb.state.tx.us/apps/facinv/FacSearchBldg.cfm
The THECB data should ultimately have been derived from the central TRECS ODS and coincide with other internal space information.

Degree Days

Monthly totals of heating and cooling degree days (HDD and CDD, respectively), will be calculated using historical information from a local weather station such as:
KATT: CAMP MABRY/AUSTIN CITY ASOS, TX, US (97.76W,30.32N)
The method for calculating monthly HDD and CDD will be based on the ASHRAE 2009 Fundamentals Handbook which specifies a balance point of 65 degrees Fahrenheit for both CDD and HDD. Online calculators which utilize this method, such as http://www.degreedays.net/, can be used to automatically tabulate the data.
For final calculations of degree day normalization, it will be assumed that HDD impacts only steam consumption, CDD impacts only chilled water consumption, and electricity consumption is not impacted by degree days.

Calculation

Variables:

GSF – Combined square footage of E&G buildings at end Fiscal Year
HDD – Annual sum of monthly heating degree days at 65 degree Fahrenheit balance point
CDD – Annual sum of monthly heating degree days at 65 degree Fahrenheit balance point
CW – Total consumed chilled water in MMBTU
ST– Total consumed steam in MMBTU
EL– Total consumed electricity in MMBTU
REDUCE% - Percent reduction over baseline year

Subscripts:

BY –Baseline fiscal year (e.g. 2009)
CY – Comparison fiscal year (e.g. 2020)

Formula:
The equation to compare any comparison year to a baseline year would be:

The test for meeting the Natural Resource Conservation Plan objective would be:

Short-term (micro)

This metric is for internal tracking of the Energy and Water Conservation program on a year-over-year and year-to-date basis in order to track annual progress towards the 2020 goal and beyond. This comparison uses building-level metered data and only compares a fiscal year or year-to-date against the same period one year prior. It also only includes buildings and metered utility data that existed through the entire period of comparison (e.g. a building or meter must have 24 months of verified data before being included in a year-over-year comparison). ENURGY will serve as the source for verified energy data and dates of building and meter inclusion.
For example, a comparison of FY2013 over FY2012 would include only the buildings and meters that existed in ENURGY at the start of FY2012 (September 1^st, 2011.) Any additional buildings, meters, or square footage added through FY2012 and FY2013 would not be included in the comparison. The advantages of this method include:

The resulting percent reduction will show only true measured and verified energy data at the building level and will better reflect the initiatives of the EWC program.
Construction of a new building midway through a comparison period will not impact the measured progress of the EWC program year-to-year.
Square-footage normalization is implicit as the square-footage of comparison remains constant through a comparison period.

It will apply primarily to E&G buildings, but can be used for Auxiliary as well. An E&G building is defined as a building with greater than 50% served E&G space as outlined in ENURGY's allocation tables (managed by Business Services).
Using the same conventions as above with the addition of new subscripts:

CYTD – Comparable fiscal year or year-to-date
PYTD – Prior fiscal year or year-to-date

Energy data for each period will be cumulated from verified monthly energy data reported by ENURGY. Inclusion of a building and/or meter in the comparison will be based on its introduction into ENURGY.
For example, a comparison of FY2013 over FY2012 would include only the buildings and meters that existed in ENURGY at the start of FY2012 (September 1^st, 2011.) Any additional buildings, meters, or square footage added through FY2012 and FY2013 would not be included in the comparison. The advantages of this method include:

The resulting percent reduction will show only true measured and verified energy data at the building level and will better reflect the initiatives of the EWC program.
Construction of a new building midway through a comparison period will not impact the measured progress of the EWC program year-to-year.
Square-footage normalization is implicit as the square-footage of comparison remains constant through a comparison period.