American Carbon Registry

Institution: Winrock Internationa

American Carbon Registry (1996; Arlington VA; 12 staff;

A nonprofit enterprise run by Winrock International, “that was founded in 1996 as the first private voluntary greenhouse gas registry in the world.” They aim to “create confidence in the environmental and scientific integrity of carbon offsets in order to accelerate transformational emission reduction actions. As a pioneer in harnessing the power of markets to improve the environment, ACR has set the bar for offset quality that is the market standard today and continues to lead market innovations.


  • California Offset Program – Under California’s cap-and-trade program, which officially launched in January 2013, the state’s largest sources of GHG emissions are required to meet the regulatory greenhouse gas (GHG) emission caps. To contain costs, up to eight percent of the compliance obligation of capped entities, estimated at 200 million tons 2013-2020, can be met with ARB offset credits.
  • Carbon Accounting – Registers GHG emissions reduction projects that meet the ACR Standards, as described below. In addition, ACR has been approved by the California Air Resources Board (ARB) as an Offset Project Registry (OPR) for the California compliance market.


Leadership: John Kadyszewski (Director)

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