
From: Don DiCristofaro <DDiCristofaro@enernoc.com> 
To: Melanie King/RTP/USEPA/US@EPA 
Cc: Rick Counihan <RCounihan@enernoc.com> 
Date: 12/12/2012 10:55 PM 
Subject: Follow up re EDF Late Filed Comment
 

Melanie, 
This is a follow up to the conversation Rick Counihan and I had with you last Friday 
regarding your question about the bar chart on page 5 of the late filed comment made by 
the Environmental Defense Fund to the RICE NESHAP docket on December 3, 2012 
(EPA-HQ-OAR-2008-0708-1482). This bar chart was created by EnerNOC using PJM 
supplied data for economic demand response (DR) that has entered the PJM market as a 
result of FERC Order 745. The data shown is the DR from the PJM Economic Load 
Response Program. Any generators participating in this program must be permitted by the 
appropriate state/county for non-emergency engine use. This chart has nothing to do with 
engines participating in emergency demand response (e.g., the Emergency Load Response 
Program (ELRP) in PJM).  
Currently EnerNOC only has two sites with generators participating in the PJM Economic 
Load Response Program and all of the generators are natural-gas fired. Currently, 
EnerNOC only targets natural gas gens because other fuels are too expensive to run 
relative to current power prices (which are driven by low price of natural gas). 
Approximately 80 to 85% of EnerNOC’s portfolio in this DR program is from curtailment 
only (e.g., turning off equipment or turning down lights, AC, etc.). 
Please let me know if you have any questions or require additional information. 
Don 
Don DiCristofaro, CCM – Air Quality Meteorologist Consultant 
EnerNOC, Inc. | 101 Federal Street, Suite 1100 | Boston, MA 02110 
m: 617.834.8408 | f: 857.221.9464  
DDiCristofaro@EnerNOC.com| www.EnerNOC.com  
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