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Willet Dairy Anaerobic Digester for power and hot water
COMBINED HEAT AND POWER FOR: dairy farm
Overview
Willet Dairy is located in Locke, NY, and
currently milks more than 5000 cows. Willet
Dairy installed an anaerobic digester gas
(ADG) system to produce biogas and
electricity. The biogas is used to fuel a
generator that produces power used on the
farm and sold back to the utility.
The Application
Willet Dairy operates one 1,000 kW
synchronous engine-generator. Gas
conditioning equipment, piping and controls
are also installed, and all are contained in a
designated building next to the digester.
Electrical loads for the farm have been
consolidated into a single 3-phase, 277/480
volt electrical service.
The electrical system is designed to
synchronize the generator to the grid, and
includes a control which allows it to
automatically isolate itself from the grid in
the event of a power outage. The generator
is hooked up for net metering with NYSEG.
A 1,000 kW, diesel generator will be
connected to the farm’s electrical system for
use during power outages.
Quick Facts Location: CHP Equipment: Locke, NY One Guascor HGM 560
NYSEG Synchronous Generator
Installation Date: Heat Recovery Application:
2012 Process Hot water
Operating Experience: Type of Fuel:
Beginning 2012 Digester Gas
Generating Capacity:
1000 kW
“Dairy digesters provide a management
method for manure that improves water
quality, reduces methane emissions from
manure lagoons and storage ponds and
minimizes odor.”
- US EPA (Environmental Protection Agency)
Web Links and Further Information:
Developer/Engineer: www.dvoinc.net
Equipment Manufacturer: www.guascor.com
DG/CHP Resources: http://dg.nyserda.ny.gov/
Willet Dairy
CHP System and Equipment The biogas flare operates using a relief valve that vents biogas to maintain the digester static
pressure requirements. Prior to the gas being sent to the gen-set, gas is first pressurized then
cooled to drop out unnecessary moisture in the biogas. The gas is then re-heated for use in the
engine.
Collection
Pit
Effluent
Tank
Seperator
Digester ScrubberCO2
Sampling
Engine
Generator
To Facility
Boiler
Pressure
Relief
To Flare
HX
Engine
Exhaust
Effluent
Biogas
Heating Oil
Electricity
Hot Water
Fuel
Oil
Economics and Environmental Benefits
Willet Dairy is trying to maximize savings by reducing its reliance on the local utility, which will
also result in more power available on the grid for other customers during peak use times. It is
anticipated that the farm will significantly reduce annual electric power usage from the utility, by
producing their own. Additional benefits include reduction in odor and potential pollutants from
the manure, and power availability during power outages. Monitored data are being collected
from the site and are available in an hourly format on NYSERDA’s DG/CHP website starting
from November 2012.
Summary of Benefits • Reduces carbon footprint
• Waste handling simplification
• Reduction in odor and potential
pollution from waste
• Reduction in energy costs
• Less reliance on utility for energy
Prepared for NYSERDA by:
CDH Energy Corp.
Cazenovia, NY 13035
315-655-1063
www.cdhenergy.com
Engine Generator Room at Willet Farm
