Stoneman Generating Station

E.J. Stoneman Generating Station is a coal-fired power station owned and operated by DTE Energy in Cassville, Wisconsin. In June 2008, DTE Energy announced plans to purchase the E.J. Stoneman Power Plant from Integrys and convert its 50MW of coal capacity to burn wood waste. Dairyland Power Cooperative (La Crosse, Wis.) is purchasing the entire 40 MW output of the waste burning facility to supply its member cooperative consumers.

At the time of DTE's announcement, the company hoped to begin the conversion in 2009. Commercial operation of the 40 MW biomass facility began on Oct. 8, 2010.

The Stoneman Station was owned and brought into service by Dairyland in 1951. Dairyland sold it in the 1990s. Current owner DTE Energy Services converted the Stoneman Station to a biomass facility, selling the energy back to its original owner.

Study finds dangerous level of hexavalent chromium at Stoneman Station waste site
The study "EPA’s Blind Spot: Hexavalent Chromium in Coal Ash," released by EarthJustice and the Sierra Club in early February 2011, reported that the level of hexavalent chromium, a highly potent cancer-causing chemical, at a coal ash site associated with the Asheville Plant was 83 parts per billion. That level is 4,150 times as high as California's drinking water goal, and 66% above North Carolina's groundwater standard. In all, the study cited 29 sites in 17 states where hexavalent chromium contamination was found. The information was gathered from existing EPA data on coal ash as well as from studies by EarthJustice, the Environmental Integrity Project, and the Sierra Club. It included locations in Alabama, Arkansas, Delaware, Florida, Illinois, Indiana, Minnesota, Massachusetts, North Carolina, North Dakota, Nevada, Ohio, Oklahoma, Pennsylvania, Tennessee, Virgina and Wisconsin. In Wisconsin, the Lemberber Landfill coal waste site and Dairyland Power Cooperative's Stoneman Generating Station's ash disposal pond was reported as having high levels of hexavalent chromium.

According to the report, the electric power industry is the leading source of chromium and chromium compounds released into the environment, representing 24 percent of releases by all industries in 2009.

A press release about the report read:


 * Hexavalent chromium first made headlines after Erin Brockovich sued Pacific Gas & Electric because of poisoned drinking water from hexavalent chromium. Now new information indicates that the chemical has readily leaked from coal ash sites across the U.S. This is likely the tip of the iceberg because most coal ash dump sites are not adequately monitored.

Plant Data

 * Owner: Mid-America Power LLC
 * Parent Company: DTE Energy
 * Plant Nameplate Capacity: 53 MW (Megawatts)
 * Units and In-Service Dates: 18 MW (1952), 35 MW (1952)
 * Location: 716 Jack Oak Rd., Cassville, WI 53806
 * GPS Coordinates: 42.7079, -90.9843
 * Electricity Production: 66,759 MWh (2005)
 * Coal Consumption:
 * Coal Source:
 * Number of Employees:

Emissions Data

 * CO2 Emissions: 91,288 tons (2005)
 * SO2 Emissions: 873 tons (2005)
 * SO2 Emissions per MWh: 26.15 lb/MWh
 * NOx Emissions: 175 tons (2005)
 * Mercury Emissions:

Related SourceWatch Articles

 * Existing U.S. Coal Plants
 * Coal plant conversion projects
 * Wisconsin and coal
 * Integrys
 * United States and coal
 * Global warming