Option 1: Metering for Building and Grounds
Option 1: Metering for Building and Grounds
Option 1: Metering for Building and Grounds
Keep good records of your data, and analyze them. The required monthly and annual consumption summaries are intended to facilitate trend analyses that account for seasonal variations by identifying and analyzing unexpected levels of use based on comparisons to the same time period in prior years.
Use trend graphs to assess weekly meter data for irregularities that could indicate a leak in the system, equipment problems, or other system-related issues that are contributing to excessive consumption.
Consider using the Energy Star Portfolio Manager to record total monthly water utility data. Using Energy Star is an easy way to compile monthly data for credit documentation.
Provide a summary report of calibration performed within the recommended interval for all meters not owned by a third party.
Both Options
Simply relying on utility bills that provide monthly consumption data does not meet the credit requirements, because the interval is too long and subsystems are not typically metered.
In exchange for these investments, the credit allows you to keep close tabs on your water use and quickly fix problems or drive toward greater efficiency. Especially in areas with higher water and sewer costs, the payback can be very favorable.
The installation of submetering equipment, if none previously existed, can lead to added costs for Option 2. Additional time will also be needed to record and analyze data from water subsystems, but this added effort is generally marginal and not a barrier to credit achievement.
For metered water subsystems, calculate the percentage of the subsystem covered by the meter. To earn the point, the meter should cover more than 80% of one or more of the qualifying subsystems. For cooling towers, 100% of the subsystem must be metered.