Please note that we’re in the process of updating the GRITS Goals sections of this guide to cover the new 2.0 version, so the information below may not be up to date. If you have any GRITS Goals questions, please reach out to us at support@gogrits.org.
The Savings Over Time table describes the resource use and financial savings that your scenario projects are expected to achieve. It displays various savings metrics for each resource saved by these projects. For example, an energy use reduction scenario will display energy savings as well as emissions abated by the scenario projects (and any additional water or waste savings resulting from those projects). All metrics will be presented in your primary target’s units (e.g. if your primary target is 20,000 MMBTU, all savings stats will be presented in MMBTU). There are three different metrics calculated for each saved resource: median/average annual savings, total to date savings, and lifetime savings.
- The Median/Average Annual calculation depends on whether you have selected the median or mean calculation of central tendencies in the “Math, Units, and Stats” sub-tab of the Settings page. Median is selected by default because it better excludes outliers. If median is selected, this metric will be called “median annual savings”. If you have selected mean, this metric will be called “average annual savings”.
- If median is selected: The bundle of projects in the scenario is treated like one large project. First, the individual project savings in each fiscal year are summed to get the scenario’s total resource savings in each fiscal year. All cumulative fiscal year savings figures are then arranged from smallest to largest, and the value in the middle is selected. If there is no single middle value, then the two values in the middle are averaged to calculate the median.
- If mean is selected: The bundle of projects in the scenario is treated like one large project. The lifetime savings for each project are summed and then divided by the Scenario Projects Lifespan (shown in the Scenario Context section). The Scenario Project Lifespan is measured from the earliest project start date to project expiration date furthest in the future. Equation: [(Lifetime resource savings for project 1) + (Lifetime resource savings for project 2) + …] / Scenario Projects Lifespan
- The Total to Date metric is calculated by adding the resource savings to date for all projects in this scenario that are marked as Completed.
- Equation: (Resource savings to date for project 1) + (Resource savings to date for project 2) + …
- The Lifetime metric is calculated by adding the lifetime resource savings for all projects in this scenario.
- Equation: (Lifetime resource savings for project 1) + (Lifetime resource savings for project 2) + …
You can also see progress metrics in the Impacts table that tell you how close to your targets you can expect to get if you implement the scenario projects. There are two types of progress metrics for both intermediate and primary targets, “projected to date” and “projected total”.
- Progress Towards Intermediate Target (projected to date) is the portion of the intermediate resource reduction task accomplished by today’s date. The intermediate resource reduction task is just the distance between the baseline and the intermediate target. The resource consumption/emissions amount projected on today’s date is divided by that value to calculate this stat.
- Equation: (baseline resource consumption/emissions amount – scenario’s projected resource consumption/emissions amount on today’s date) / (baseline resource consumption/emissions amount – intermediate target resource consumption/emissions amount)
- Progress Towards Primary Target (projected to date) is the portion of the total resource reduction task accomplished by today’s date. The total resource reduction task is just the distance between the baseline and the primary target. The resource consumption/emissions amount projected on today’s date is divided by that value to calculate this stat.
- Equation: (baseline resource consumption/emissions amount – scenario’s projected resource consumption/emissions amount on today’s date) / (baseline resource consumption/emissions amount – primary target resource consumption/emissions amount)
- Progress Towards Intermediate Target (projected total) is the portion of the intermediate resource reduction task accomplished by the intermediate target date. The intermediate resource reduction task is just the distance between the baseline and the intermediate target. The resource consumption/emissions amount projected on the intermediate target date is divided by that value to calculate this stat.
- Equation: (baseline resource consumption/emissions amount – scenario’s projected resource consumption/emissions amount on intermediate target date) / (baseline resource consumption/emissions amount – intermediate target resource consumption/emissions amount)
- Progress Towards Primary Target (projected total) is the portion of the total resource reduction task accomplished by the primary target date. The total resource reduction task is just the distance between the baseline and the primary target. The resource consumption/emissions amount projected on the primary target date is divided by that value to calculate this stat.
- Equation: (baseline resource consumption/emissions amount – scenario’s projected resource consumption/emissions amount on primary target date) / (baseline resource consumption/emissions amount – primary target resource consumption/emissions amount)