Environmental Sustainability

ADI and its employees are committed to protecting the environment and the health & safety of fellow employees, customers, and the public.

Greenhouse Gas

We use the Greenhouse Gas Protocol: A Corporate Accounting and Reporting Standard in estimating our greenhouse gas (GHG) emissions and employ Global Warming Potentials from the IPCC Fifth Assessment Report. The emission factors that we used were extracted from the US-EPA Climate Leadership Emission Factors for Greenhouse Gas Inventories and market-based emission factors were applied if available; otherwise, location-based emission factors were used.

GHG emissions that are generated directly and indirectly are categorized into “scopes” based on the source of the emissions. ADI monitors Scope 1 and Scope 2 emissions and consolidates GHG emissions from which it has operational control - its wafer fabrication facilities, and assembly and test facilities.  

  Scope 1 Scope 2 Scope 3
Greenhouse Gas Protocol Scope Definitions The Greenhouse Gas Protocol defines Scope 1 emissions as those that come directly from sources owned or controlled by the entity, including emissions from fossil fuels used on site. Scope 2 emissions are indirect emissions that result from electricity, heating, and cooling generated offsite but purchased by the entity. Scope 3 emission sources include purchased goods and services; fuel and energy related activities not included in Scope 1 or 2; waste generated in operations; business travel; employee commuting; downstream transportation and distribution; and end of life treatment of sold products.
Source and Associations Stationary combustion and process emissions:
  • Perflourocarbons (PFCs)
  • SF6
  • NF3 (from wafer fabrication processes)
Purchased electricity Business travel

Since 2013, our Scope 1 and 2 emissions and our Scope 3 emissions from business travel have been verified by a third party. We also report our emissions to the CDP.

Scope 1 Emissions

Scope 1 Green House Emissions We emit PFCs from wafer fabrication processes and carbon dioxide (CO2) from fuel combustion associated with power and heat generation. Improvements in our abatement systems have led to a significant decrease in our Scope 1 emissions. In 2018, absolute Scope 1 emissions went down by 29% relative to 2015, while normalized emissions were reduced by 38% over that same time period.

The chart below show the company’s Scope 1 emissions, both absolute and normalized, from 2015 up to 2018.


Scope 2 Emissions

Scope 2 Greenhouse Emissions We are constantly looking for ways to reduce our electricity consumption, therefore our Scope 2 GHG emissions. In the last quarter of 2016 and in 2017, we shifted to renewable energy sources. We are now are realizing the benefits of these actions and decisions, resulting to a significant decline in our absolute Scope 2 emissions despite the company’s growth.

The chart below show the company’s Scope 2 emissions from 2015 up to 2018. The increase in our 2018 Scope 2 emissions compared to 2017 is brought by growth in our operations.


*Our Scope 2 emissions are solely from purchased electricity that are used at our manufacturing facilities.

Improvements in our abatement systems as well as shifting to renewable energy sources have driven the downward trend in our normalized emissions. Our wafer fabrication sites achieved a 38% decrease in normalized Scope 1 emissions, while our assembly and test facility realized a 36% decrease in normalized Scope 1 + 2 emissions. These significant cut in our emissions over the past two years have encouraged us to do more. Hence, we are setting up a new aggressive target of 50% reduction in emissions by 2025 from 2015 baseline.

2017 Actual Performance Against 2015 Normalized Goals

Scope 3 Emissions

ADI has programs to educate employees about GHG emissions associated with travel/commuting and encourages employees to carpool or use other alternatives whenever possible. For example, our Philippines site provides commuting shuttle buses and encourages employees to use them, providing a safe, comfortable, and free ride that helps to reduce traffic, air pollution, and the release of CO2 to the atmosphere. ADI’s Wilmington, MA facility encourages employees to carpool by providing prime parking spots. Lastly, ADI makes strides to use teleconference and videoconference technology when possible to reduce GHG emissions from business travel. This has greatly contributed to the decrease of our 2018 Scope 3 emissions from the previous year by 52%.

Scope 3 Emissions (Tons)

Environmental Spotlight: Limerick Energy Initiatives

ADI Limerick uses 100% renewable energy, but that doesn’t hinder the focus on improving energy efficiency site wide. A new cooling tower offers considerable energy savings, and a pump replacement plan within the Facilities department ensures maximum energy efficiency for the high energy plant and associated equipment. Every two years, the site is reassessed during an energy efficiency audit and recommendations are implemented where possible to continue this positive trend.

LEED Building at Limerick Campus

LEED Building at Limerick Campus

LEED accreditation requires every part of the planning, design, and build of a new building to consider best practices in sustainability and energy efficiency. The European Research and Design Center (ERDC Building in the Limerick campus has been LEED-Platinum certified meeting the highest standards for green buildings. The site features intelligent carpark lighting, use of sustainable building materials, reuse of materials where possible during the construction phase, use of low energy equipment, use of low GWP refrigerants, and a carpark that filters the water in order to protect the quality of the groundwater.

Carbon emissions from transport
Newly installed and constantly used electric car charging stations reside on the Limerick campus to promote the use of electric cars. The site also continually promotes cycling to work, and has upgraded the shower areas and bicycle storage areas to encourage employees to cycle to work. If employees must use car transportation, there are priority parking spaces given to employees who car pool. Teleconference facilities have also been installed throughout the campus to help avoid unnecessary overseas travel.