FERC Relicensing of the Conowingo Dam

FERC Relicensing of the Conowingo Dam

UPDATE: In October 2018, a Baltimore Court dismissed the first of the suits filed by Exelon. Governor Hogan's response can be found here.

Interested in the court documents? On October 17, 2018, MDE filed a Notice of Supplemental Authority with an Exhibit. Exelon responded on October 24th.   


In a disappointing (though not unexpected) turn of events, Exelon has chosen to respond to the Maryland Department of the Environment's (MDE) Water Quality Certification (WQC) with a storm of litigation. In addition to the letter itself, we have provided links to Exhibit A: Complaint in the U.S. District Court, Exhibit B: Administrative Appeal to MDE and Exhibit C: Complaint for Mandamus in Baltimore City Circuit Court.

The Coalition, on behalf of each of the Maryland counties that serve as its members, has filed its Motion to Intervene in the relicensing application process associated with the Exelon’s Conowingo Dam hydroelectric project. This intervention presents the most significant opportunity to save the Bay in our lifetime, given that the license renewal is for a term of 30-50 years. The Coalition’s intervention will hopefully move the Federal Energy Regulatory Commission (FERC) to impose significant conditions upon the relicensing of the Dam. These conditions would require the cleanup of the toxic conditions which exist in sediment of the Dam's reservoir, thereby minimizing further contaminants from entering the Bay.

In the 2010 TMDL, the United States Environmental Protection Agency (EPA) estimated that the Conowingo Reservoir trapped 55% of the phosphorus and sediment that flowed down the Susquehanna River. That assumption is actually incorrect and is unsupported by the recent studies of the United States Geological Survey (USGS) scientists upon whom the EPA relied to make its erroneous trapping assumption. The Conowingo Reservoir is no longer a significant trap of phosphorus or sediment. Not only are the sediments flushed into the Bay from the Susquehanna River and scoured from the Conowingo Dam reservoir harmful to the Bay’s health, they are detrimental to the State’s fiscal health by having direct negative effects on local shoreline communities and their economies, as well as the multi-million dollar price tag associated with the dredging and maintenance of the polluted sediments.

In determining the sediment and nutrient loading from the Susquehanna River Basin, there exists another critical scientific fact that both EPA and MDE have overlooked. Toxic levels of both nitrogen and phosphorus have bound to the sediments that have been deposited into the lakes and reservoir above the Conowingo Dam. These nutrients are inert, meaning they stay bound to the sediments, while the sediments stay behind in the reservoir and lakes above the Conowingo Dam. However, once those sediments are transported and violently churned through the Dam and into the Bay, changes in water temperature, pH, salinity and the level of dissolved oxygen cause the nutrients bound to the sediments to be quickly dispersed into the Bay, despite the fact that such nutrients were not released into the water while they remained in the Susquehanna River. The end result is that tremendous damage is caused to the Bay because these sediments were not subject to any dredging or other cleanup while they remained stagnant in the reservoir above the Dam.

CCC Advocacy in the FERC Process

Letter to FERC re: Exelon's WQC Withdrawal
4 March 2016

Letter to FERC re: US EPA Request for Inclusion of Draft LSRWA Report
6 January 2015

Notice of CCC Staff Attendance at MDNR Meeting
6 November 2013

Letter to FERC re: Exelon's Extension Request
23 August 2013

Response to FERC's June 13, 2013 Letter
18 June 2013

FERC's Response to Coalition's April 4, 2013 Correspondence
13 June 2013

Response to FERC's Reply re: Meeting
14 April 2013

FERC Denial of CCC Meeting Request
29 March 2013

Letter to FERC re: Meeting Request
22 February 2013