“The Environmental Protection Agency has estimated the leak rate at a little more than 2 percent . . .”

-J. Nocera, “How to Extract Gas Responsibly” NYT (Feb 28, 2012)

FACT: In 2010 and 2011, the EPA substantially revised and increased their estimates of methane emissions from natural gas systems.  As of the end of 2011, the most recent EPA data indicate leak rates of 2.5% for conventional natural gas and 3.9% for shale gas (details of calculation here) over the full life-cycle.  A recent field study of methane emissions from an unconventional gas field in Colorado suggests the EPA estimates may be low.

About these ads

One thought on ““The Environmental Protection Agency has estimated the leak rate at a little more than 2 percent . . .”

  1. Just curious.. why use these (relatively low) numbers, compared to the 6.2% initial failure rate, and 60% failure rate over 20 years, cited by Dr. Ingraffea here?

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Follow

Get every new post delivered to your Inbox.

Join 172 other followers

%d bloggers like this: