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Guide to
Anaerobic Digesters

Guide to Operational Systems

U.S. Operating Digesters by State

AL, AK, AZ, AR, CA, CO, CT, DE, DC, FL, GA, HI, ID, IL, IN, IA, KS, KY, LA, ME, MD, MA, MI, MN, MS, MO, MT, NE, NV, NH, NJ, NM, NY, NC, ND, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WA, WV, WI, WY

Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
California
CA	1982	Dairy; 400 milkers	Scrape	$200,000	Electricity and hot water	1,186
CA	2002	Dairy; 650 milkers	Solids separator; scrape	$386,000	Electricity and hot water	2,965
CA	1998	Dairy; 200 to 300 cows (includes dry stock and heifers)	Flush	$225,000	Flare	800
CA	2001	Dairy; 5,000	Vacuum scrape	Not available	Electricity and hot water	119
CA	2002	Dairy; 7,000 milkers, 3,000 other	Vacuum scrape	$1.8 M	Electricity and hot water	296
CA	1982	Swine; 300 sows farrow- to-finish	Flush	$220,000	Electricity and hot air	741
CA	2000	Dairy; 200 milkers, 50 dry	Flush and scrape	Not available	Electricity and hot water	741
Colorado
Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
CO	1999	Swine; 5,000 sow farrow- to-wean and 1,200 growing pigs (replacement stock)	Pull plug	$368,000	Electricity	1,482
Connecticut
Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
CT	1997	Dairy; 600 milkers	Scrape	$450,000	Electricity	1,631
CT	1997	Dairy; 200 milkers	Scrape	$149,000	Hot water and flare	1,387
Florida
Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
FL	2000	Dairy; 500 cows	Hydraulic flush	$150,000	Hot water and flare	3,467
Illinois
Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
IL	1998	Swine; 8,300 finishing hogs	Pull plug	$140,000	Hot water and flare	2,380
IL		Dairy; 1,400 lactating	Scrape	$1.2 M	Electricity	10,673
IL		Dairy; 2,000 lactating	Scrape	$875,000	Electricity	7,293
Iowa
Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
IA	1998	Swine; 3,000 nursery pigs	Pull plug	$15,000	Flare	1,738
IA	1996	Swine; 5,000 sows farrow-to-wean	Pull plug	$500,000	Electricity	1,482
IA	2002	Dairy; 480 cows	Scrape	$348,000	Electricity and heat	2,372
IA	2002	Dairy, 800 cows	Scrape	$450,000	Electricity and hot water	2,965
IA	2002	Dairy; 170 (100 milkers, 20 dry)	Scrape	$200,000	Hot water	1,179
Maryland
Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
MD	1994	Dairy; 120 lactating, 70 heifers	Scrape	$500,000	Flare	1,317
Michigan
Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
MI	1981	Dairy; 730 milkers	Scrape	$150,000	Electricity	5,061
Minnesota
Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
MN	1999	Dairy; 850 milkers	Scrape	$355,000	Electricity and hot water	3,854
Mississippi
Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
MS	1998	Swine; 145 pigs	Recycle flush	$27,000	Flare	84
New York
Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
NY	1998	Dairy; 500 to 550	Scrape	$295,700	Electricity and hot water	3,640
NY	1985	Dairy; 295 milkers	Scrape	$500,000	Electricity and hot water	2,045
NY	2001	Dairy; 560 milkers, 40 dry	Scrape and gravity flow	$350,000	Electricity and hot water	3,854
NY	2001	Dairy; 850 milkers, 100 dry	Continuous scrape	$400,000	Hot water	1,779
NY	2001	Dairy; 100 milkers	Gutter flush with liquid solids separation	Not available	Hot water	693
North Carolina
Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
NC	1997	Swine; 4,000 sows farrow-to-wean	Pull plug and gravity flow	$290,000	Electricity and hot water	2,317
Pennsylvania
Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
PA	1983	Dairy; 250 milkers	Scrape	$80,000	Electricity and hot water	1,334
PA	1985	Swine; 4,000	Scrape	$225,000	Electricity and hot water; flare	3,854
PA	1985	Swine; 1,000 sows farrow-to-finish	Scrape	$325,000	Electricity and hot water	1,666
PA	1983	Chicken; 350,000 layers	Scrape	$125,000	Electricity and hot water	4,447
PA	1979, 1981, 1984 (three digesters)	Dairy; 2,300 milkers	Scrape	$225,000 each	Electricity and hot water	10,376
Vermont
Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
VT	1982	Dairy; 340 milkers	Scrape	$300,000	Electricity and hot water steam)	2,357
Virginia
Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
VA	1993	Swine; 600 sows farrow-to-feeder	Flush and pull plug	$85,000	Electricity	397
Wisconsin
Location	Year built	Animal type and population	Manure handling	Installed cost	Biogas end-use	CH4 reduction Mt CE/year*
WI	2002	Dairy; 900 cows	Scrape	$425,000	Electricity and hot water	3,706
WI	1988	Ducks; 300,000	Scrape	$500,000	Digester heat and electricity	5,336
WI	2002	Dairy; 600 milkers	Scrape	$550,000	Digester and dairy heat, electricity, and hot water	4,002
WI	2002	Dairy; 750 cows	Recycle flush	$487,500	Electricity, heat, and hot water	4,743
WI	2002	Dairy; 2,800 milkers	Scrape	$1.4 M	Digester heat, dairy heat solids drying, electricity, hot water, and flare	12,600

* Greenhouse gas emissions in the U.S. are most commonly expressed as metric tons of carbon equivalents (Mt CE/year). This measure is used to compare the emissions of different greenhouse gases based on their global warming potential.

¹ Includes other costs associated with the farm's manure management system (e.g., storage tanks, alley scrapers)




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