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Renewable Natural Gas (RNG)

What is RNG?

According to the page on the US Department of Energy website, “Renewable natural gas (RNG) is a pipeline-quality gas that is fully interchangeable with conventional natural gas and thus can be used in natural gas vehicles.” RNG is often captured during biomass processing (such as compost, landfills, wastewater processing, or anaerobic digesters), and requires little purifying to create a high-methane, efficient fuel.

How is RNG made?

RNG is the naturally-occurring gas from decomposing organic matter. The best way to collect RNG is a closed system that captures the RNG as it is produced.

What is an Anaerobic Digester?

An anaerobic digester (AD) is a biomass processor that facilitates an oxygen-deprived environment for bacteria to break down organic material such as manure, wastewater, and landfills and capture the resulting methane.

Waste Types Used to Make RNG
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How many Anaerobic Digesters are in Indiana?

There are approximately 11 anaerobic digesters in Indiana; some locations host more than one digester at a single site.

Who has ADs in Indiana?

Anaerobic Digesters in Indiana are often on hog, cattle, and dairy farms to reduce the transport distance from the source to the digester. Some digesters co-digest non-livestock waste like restaurant grease, discarded oils and fats, agricultural reside, and food waste.

Indiana AD Statistics
From AgSTAR Livestock Anaerobic Digester Database
Company NamePlant LocationAnimal TypesCo-digestionElectricity GeneratedBiogas Production# of Employees
Bio Town AgReynolds4500 cattle, 1600 swineYes70,364,700 kWh/yrN/A14 (0)
Bos Dairy DigesterFair Oaks3600 dairyNo   
Green Cow PowerGoshen1500 dairyYes 907,200 ft3/day 
Herrema Dairy DigesterFair Oaks3750 dairyNo   
Hidden View DigesterRensselaer3500 dairyNo 7,073,700 kWh/yr 
Homestead Dairy DigesterPlymouth2100 dairyFats, oils, greases7,446,000 kWh/yr  
Prairie’s Edge Dairy Site 2, Digester 1Fair Oaks12000 dairyNo7,818,300 kWh/yr1,200,000 ft3/day 
Prairie’s Edge Dairy Site 2, Digester 1Fair Oaks4300 dairyNo   
Waste No Energy DigesterMonticello300 cattle, 8000 swineAgricultural Residues; Fats, Oils, Greases; Food Processing Wastes; Food Wastes8,370,000 kWh/yr408,000 ft3/day 
Windy Ridge Dairy DigesterFair Oaks7000 animalsNo   

How electric or gas is made for an AD?

Natural gas and electricity are two of the possible end products for ADs. Through further refinement and purification, both RNG and biogas are renewable fuels. Additionally, the solid byproduct of ADs is reusable in feed, fertilizer, and animal bedding. Because of this continuous cycle of use and come from renewable resources like the dairy and hog industries, anaerobic digesters are highly efficient processors with multiple products.

Anaerobic Digestion Products, Biogas Treatment, and End Uses
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