Appendix B - Estimated greenhouse gas (GHG) reductions from five-day delivery
Exhibit 5. Annual GHG emission reduction estimates
| Area |
Emissions reduction due
to elimination of Saturday
(MT of CO2) |
% of total reduction |
| Facility energy use |
0 – 3,746 |
0.1% |
| Postal-owned rural and city delivery, and mail
transport vehicles |
195,859 – 260,135 |
57.0% |
| Highway contract route vehicles |
119,475 – 238,950 |
42.8% |
| Air transportation |
0 |
0% |
| Total |
315,334 – 502,831 |
100% |
The following assumptions were made to develop the estimate:
Emissions of CH4 and N2O are excluded from the vehicle fuel calculation since their level and CO2 equivalency is small compared to direct CO2 emissions.
The estimated range of reductions of energy use at large facilities (>50,000 gross square feet) was based on:
- Saturday total energy use for a mail processing unit ranged between 70 and 100 percent for a typical operating day.
- A potential reduction in HVAC energy use ranged between 0 and 5 percent.
- A potential reduction in mail processing energy use ranged between 0 and 30 percent.
- A potential reduction in other electrical use ranged between 0 and 10 percent.
- No estimated energy savings at small facilities (<50,000 square feet).
- An estimated range of reductions for rural and city route delivery miles was between 70 and 100 percent of current Saturdays. Remaining miles were to accommodate non-routine delivery work and Express Mail. Estimated range of reductions in Saturday transport miles for postal vehicles was between 25 and 55 percent. The estimated range of reductions for highway contract routes was between 30 and 60 percent in Saturday transport miles.
