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Costs of Anaerobic Digestion – Capital Cost per Cow Plus Electricity and Gate Fee Income

The Costs of Anaerobic Digestion are of course what everyone thinking of embarking upon a biogas project wants to know. At the same time very few AD Plant owners and contractors give out their costs to a general audience. Finding costs and income data is rare.

Image is the feature image thumbnail for the articles "Costs of Anaerobic Digestion".

That’s understandable due to the commercially sensitive nature of such information.

So, to assist our readers we have done the research for you, with 4 resources provided below which help assess AD Plant Costs on this page alone.

Visit the main AD Community website AD costing page here, or stay here, scroll down and read!

We have found the following downloadable resources which provide information on farm waste anaerobic digestion costs:

  All costs are indicative only, and we recommend reading the original documents before deciding whether to use any of the data provided here.

1. Downloadable pdf (Chapter for a Conference Paper) Titled “Costs of Anaerobic Digestion”

Excerpt from the pdf:

The cost of a complete dairy waste management system may exceed $1,200 per cow.

Anaerobic digestion system [capital] costs however, are confined to the cost of the anaerobic process, post solids handling, and energy production.
Part of page which gives indicative costs of AD Plant use.
A review of the anaerobic digestion system costs at U.S. dairies compiled by Lusk has established that the typical anaerobic system constructed in the U.S. had an average cost of $470 per cow.

  • The proposed thermophilic digestion project at Three Mile Farm (21,000 cows) in Oregon projected a cost of $710 per cow.
  • The proposed contact process at Myrtle Point (4,500 cows) Oregon has a proposed cost of $678 per cow for digestion, solids handling, and power generation.
  • The recently constructed Cal Polly flush system anaerobic lagoon had a cost of $800 per cow.
  • Anaerobic systems for digestion, solids processing, and generation are expected to cost $500 to $800 per cow.

Per-cow capital cost estimates can be deceptive since some processes treat the entire waste stream while others treat only a portion of the waste stream.

For example, the plug flow systems documented by Lusk treat only the concentrated portion of the manure while excluding the milking parlour waste (15% of dairy manure).

As pointed out earlier, use of any particular system will have an effect on the other. For example:

  • If a flush system is used the anaerobic digester must be larger.
  • If pre screening and sedimentation are used, the amount of energy produced will be lower.
  • If there is post processing, that will also raise the cost of ultimate solids disposal.

In many cases, solids must be exported from the site and transport costs need to be added.

Note; Costs are given 2009 figures or earlier.

First published on Scrbd where it’s available as a Free download (PDF) File (www.scribd.com)


2. Tariffs Payable to Electricity Power Generators Feeding Power into Local Electricity Grids

Having provided above some information on on-farm biogas plant costs we are aware that the next question is:

“So what would the farm business be paying for that electricity if they were not generating it themselves”.

So, we found the McDowell Purcell article linked to below, which discusses the EU electricity payments which the biogas plant operator can receive for their power fed out into the local electricity distribution grid.

The full article also includes a table of electricity charges within EU nation states . For you information we have included that table below, however, you should also visit the original web page which is at:

McDowell Purcell Solicitors Website Provides Anaerobic Digestion Electricity Costs Comparison

 comparative electricity prices

The author, from Mc Dowell Purcell Solicitors, makes the point that with the notably lower electricity tariffs available in Ireland AD developers are forced to rely on income derived from gate fees in which the waste producer pays the AD plant to take the waste.

The requirement for a reasonably high gate fee, before anaerobic digestion plants become financially viable, is a substantial barrier to the emergence of Anaerobic Digestion Plant projects. The gate fee is much more important for Irish plant operators due to their low electricity charges. via www.mcdowellpurcell.ie

3. WRAP Data on Anaerobic Digestion Gate Fees in the UK

Green Biogas imageSo, what might those gate fees which an Anaerobic Digestion Plant operator can charge to accept suitable organic waste at the site gate, amount to, we asked ourselves? Well, there is information available, and which seems to be annually updated, at the UK Government Funded WRAP website which suggests a median gate fee price in the UK for an anaerobic digestion plant, at £41/tonne in 2012.

“WRAP’s fifth annual Gate Fees report presents a summary of gate fees charged for a range of alternative waste treatment, recovery and disposal options, together with an analysis of the factors likely to influence future gate fees and comparison with last year’s report.”

You can check out the WRAP report and their table of gate fees here: wrap.org.uk Gate Fees Reports

4. US EPA Report on Benefits, Costs and Operating Experience at Seven New Agricutural Anaerobic Digesters

US EPA CostingsAbstract: Farmer motivation for building and operating anaerobic digesters has expanded from solely energy benefits to include manure treatment cost savings, nutrient conversion, odor and pathogen control, and byproduct recovery.

AgSTAR has provided technical assistance to seven farms to assist them through the development, installation, start-up and operating phases of their anaerobic digestion projects.

Three dairy plug flow digesters (NY, CT, OR), three covered pig manure lagoons (NC, VA, IA) and one heated mixed pig manure digester (IL) have been placed in operation since January 1997 with AgSTAR technical assistance.

The farms and their digester systems are described.

The cost of the digester systems are summarised. Biogas recovery and use in boilers or engine generators is discussed for each farm.

Start up and operational lessons learned are presented.

References and calculations are included. via www.epa.gov


Community Anaerobic Digestion Plant

Considering that a centralised on-farm community Anaerobic Digestion Plant might operate at a throughput annually of 30,000tpa, that means that the gate fee income alone might easily amount to £125,000 annually and that is just one income stream and does not include the revenue from the power production (Pricing date: 2013).

 

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Comments

    • Biomass Digestion
    • May 28, 2013
    Reply

    I think it is a great solution to our energy needs. Not as great as wind or solar power but biomass is the way forward for farmers etc.

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