Emissions & Energy
Energy use, specifically electricity use, is the main driver of our scope 1 and 2 GHG emissions. From 2018 to 2021, our total energy use at our headquarters in Austin decreased by 9%. Our total GHG emissions decreased by 29%. In order to continue our GHG reductions, we have set a corporate target to reduce Scope 1 and 2 GHG emissions by 50% for Silicon Labs corporate headquarters by the end of 2025 from baseline year 2018. We are committed to purchasing more green energy to continue improving towards our target, as well as expanding measurement and conservation targets to our global sites.
Our emissions and energy data from 2018 to 2021 for our Austin headquarters were as follows:
| |
2018
|
2019
|
2020
|
2021
|
|
Energy Use - Total (GWh) from Grid
|
8.5
|
8.3
|
7.5
|
7.7
|
|
Energy Use - Percent from Grid
|
100%
|
100%
|
100%
|
100%
|
|
Renewable Energy (GWh)
|
3.6
|
3.6
|
3.6
|
3.7
|
|
Renewable Energy (Percent)
|
42%
|
43%
|
48%
|
48%
|
|
Non-Renewable Energy (GWh)
|
4.9
|
4.7
|
3.9
|
4.0
|
|
Non-Renewable Energy (Percent)
|
58%
|
57%
|
52%
|
52%
|
|
C02e (metric tons, scope 1&2)*
|
3,027
|
2,510
|
2,088
|
2,163
|
|
Scope 1
|
86
|
100
|
56
|
42
|
|
Scope 2*
|
2,941
|
2,410
|
2,032
|
2,121
|
|
Other Significant Air Emissions (metric tons)**
|
1.30
|
1.25
|
1.29
|
1.09
|
*2021 calculated with latest available 2020 CO2e factors, and is subject to revision.
**Includes NOx, CO, VOC, PM and SO2 from generator and estimated boiler and solder usage.
Water Usage
We primarily use water for human consumption and hygiene purposes; therefore, our conservation efforts include low-flow bathroom facilities and reduced landscaping water usage. We do not use significant amounts of water for production or manufacturing.
Our water data from 2018 to 2021 for our Austin headquarters were as follows:
| |
2018
|
2019
|
2020
|
2021
|
|
Water use (million liters)
|
9.2
|
9.6
|
3.0
|
3.3
|
Waste Management
We started tracking total waste generated in 2019. At that time, we achieved a 61% landfill diversion rate, with more than 99% of our waste generated being non-hazardous waste. Since then, we have implemented measures to improve our diversion rate such as ensuring higher availability of recycling options, providing improved signage of recyclable material and donating reusable material to local causes.
Our waste data from 2018 to 2021 for our Austin headquarters were as follows:
| |
2018
|
2019
|
2020
|
2021
|
|
Waste water (million liters)
|
9.2
|
9.6
|
3.0
|
3.3
|
|
Landfill (metric tons)
|
-
|
83
|
42
|
41
|
|
Landfill diversion rate
|
-
|
63%
|
73%
|
77%
|
|
Hazardous Material Waste (metric tons)
|
0.14
|
0.13
|
0.00
|
0.00
|
Any and all e-waste generated at Silicon Labs is disposed of in accordance with the Waste and Electronic Equipment (WEEE) Directive.