Newsletter of the ATTRA - National Sustainable Agricultural Information Service: A project of the National Center for Appropriate Technology (NCAT).
Energy Conservation and Renewable Energy
NCAT—ATTRA’s parent organization—was founded 29 years ago to promote energy-saving techniques, many of them simple and inexpensive. The methods are pretty well worked out now, and on-farm tinkering will perfect them. The time is right to put all those great ideas to work on America’s farms and get serious about energy conservation and renewable energy. You can call NCAT’s specialists at 800-346-9140 for information about how to make your farm more energy efficient.—Karen Van Epen, ATTRAnews editor
In this issue:
Excerpted from the ATTRA publication by NCAT Program Specialists Mike Morris and Vicki Lynne. See also Freeze protection for Solar-Powered Livestock Watering Systems.
Remote or off-grid power sources—including solar panels, mechanical windmills, and portable generators—can pump water for livestock in locations where electricity from power lines is unavailable. By encouraging animals to move away from lakes and streams, these systems give livestock greater access to forage. They also reduce livestock pressure on stream banks, preventing nutrient loading, damage to streamside vegetation, erosion, and pollution.
Solar pumping is a natural match for summer grazing applications, since it produces the greatest volumes of water in sunny weather and during long summer days—exactly when animals need water the most.
Many people who consider a solar water pumping system may balk at the initial expense. Looking at the big picture gives a better idea of the actual cost. For one thing, utility line extensions commonly cost $10,000 to $30,000 or more per mile. One rule of thumb is that remote pumping (whether solar-, wind-, or generator-powered) is worth considering whenever the distance from the utility grid exceeds about one-half mile. Where power lines are readily available, they will generally provide the cheapest source of power.
ATTRA Publiciation: Solar-Powered Livestock Watering Systems
by Al Kurki, NCAT Program Specialist
You hear a lot of talk about the tail-pipe and light-socket benefits of renewable energy: reduced dependence on foreign oil, far less pollution, greenhouse gas reduction, regenerative production, and so on. We at NCAT want to find the answers to a new round of questions about biofuels, biomass, and to some extent, wind development.
Are these farm-based renewable energy paths really sustainable? Do they preserve soil and provide a decent livelihood for farmers? How accessible are renewable energy technologies for a wide array of farmers and ranchers? Are they suitable for small- and medium-sized farms?
What are we learning as more wind and biofuel development takes place? What is really working for farmers? Where are the energy “weak links” in our food, fiber, and biofuels systems, including organic and no-till? Are we overlooking conservation in our emphasis on renewable energy production?
NCAT’s vision is that the current corn-based ethanol production will be a transition to more sustainable bio-energy production. Biofuel crops will be raised within soil-building rotations, not in extractive, industrial-style monocultures. Farmers and other rural people will see real gains in their incomes and quality of life. They will not merely provide commodity products at the lowest possible price.
There are now active models of every form of renewable energy development, of shortening food supply lines, and of farm-based carbon sequestration. At this point we should be able to learn what is working well for farmers and the environment, and what sort of trade-offs have to be rejected or accepted.
NCAT is crafting a project to make sure we fully understand and use the principles of sustainability as we develop renewable energy. The Reaping What We Sow Project will combine grassroots efforts, regional gatherings, and possibly a national conference.
We’d like to hear what you think about all this. What questions come to mind? What other factors need to be looked at? Would you like to be involved or be kept posted? Please direct your comments to Al Kurki, email@example.com, (406) 449-0104.
Excerpted from the 2004 publication by NCAT Program Specialist Dave Ryan.
Biodiesel fuel can be made in any quantity, from a cup or so up to many gallons. Since it is better to make small mistakes than big mistakes, I encourage people interested in making biodiesel to start with small batches and gradually work up to making larger batches.
If you have access to inexpensive oil or grease, such as a by-product of some process, it may be quite cost-effective for you to manufacture your own fuel from these by-products. Although you may have to pay for waste vegetable oil, you can often get it free from restaurants. Shop around. Smaller restaurants may let you pick up waste oil in buckets, if you provide exchange buckets. Find out when the fryer oil is to be changed, and pick it up warm if you can. To get the best quality oil, talk to the restaurant owner and, more importantly, to the head cook, and let them know what you are doing and what you need. If you do not make a mess and are conscientious, most restaurant owners will be happy to work with you.
ATTRA Publication: Biodiesel—A Primer
These publications and hundreds of others can be viewed and downloaded from the ATTRA Web site and/or ordered free of charge by calling 800-346-9140.
For most people, a small (1 to 18 kilowatt) turbine is going to make little economic sense, particularly if it is connected to the grid. By my calculations, unless you can somehow factor in some very significant tax savings, a small wind turbine will not pay for itself within ten years. To do that, you need to install a wind turbine for less than $750 per kilowatt. Any good small wind turbine—and there are several on the market—will cost $1,500 to $3,000 per installed kilowatt.
But that doesn’t mean that you can’t have other good reasons for installing a small wind turbine. It is an excellent hobby. It provides a hedge against the inflation of retail energy prices. You know now what you will pay for fuel inputs in 100 years: nothing. It allows you the kind of independence and self-sufficiency once common in the West, and now all but disappeared. It makes a statement for renewable and clean energy production— important whatever the scale.
Many, if not most, people over-estimate the strength of the wind on their own places. I’m regularly told that “it blows like crazy around here,” and occasionally that they have to fasten their seat belt when they sit down on the toilet in the winter. But in fact nothing takes the place of real data. Begin with a wind map. You can find them on the Internet (www.nrel.gov). Then put up an anemometer to record wind data.
There are two things you absolutely need to know when you start thinking about installing a small wind turbine. First, you need to know the quantity (how much usable wind) and the quality (wind curve, prevailing direction, sheer, turbulence) of the local wind regime. Two, you need to know what your load will be, how much electrical power you consume. Some people, very few, know how much they pay for electricity. But I have yet to meet anyone who knows how much electricity they use in the course of a year. The point is, you need to determine the load before you start thinking about turbine size. Load and size should be related.
If you want to connect to the grid, you need to know how close the electrical transmission and distribution lines are to the place where you are going to install the turbine. Most turbines require a three-phase interconnection. Running new three-phase any distance becomes very expensive very quickly.
Getting started small-scale in the wind business is much easier now than when I first installed a 65-kilowatt turbine on our ranch 21 years ago. The U.S. Department of Energy puts out all kinds of useful brochures. You have unlimited amounts of Internet information. Almost every town of any size has businesses which first advise you and then install wind and solar equipment.
Otherwise, it’s just a matter of following these steps: do the basics (wind regime, load, and transmission), decide whether you want to supply all or part of your own needs (on a net-metering basis) or sell power to others (possibly a neighbor as well as the utility), contact someone knowledgeable about the details, and see your banker. With a cash flow schedule in hand, most banks will now loan you the money you need.
As rancher Corky Brittan points out above, there’s a vast amount of information about renewable energy on the Internet. Here are some great leads, with links to more.
Fuels Data Center
Friendly Farming project
Bill Clean Energy
for an Energy Efficient Economy
York State Research & Development Authority
with the Sun: Solar Energy and Agriculture
Wind Farmers Network
Public Service: Energy on the Farm
Excerpted from Water Management and Equipment Maintenance: The Montana Irrigator’s Pocket Guide. This little pocket guide is overflowing with practical ways to save water, soil, and energy. The ideas are useful far beyond Montana. The guide is available free of charge from NCAT by calling 800-346-9140.
Many producers aren’t very concerned about leaks and worn nozzles because “the water ends up on the field anyway.” What they don’t realize is that leaks and worn nozzles reduce system pressure and pump efficiency, cause poor water distribution, and increase electrical demand and energy costs. Leaks can overload motors and shorten motor life. Just a tiny bit of nozzle wear (a few thousandths of an inch) can cause a big increase in sprinkler output. Depending on your system’s efficiency and your electricity costs, those worn sprinkler nozzles can cost you hundreds of dollars over the course of a season.
ATTRAnews is the bi-monthly newsletter of the National Sustainable Agriculture Information Service. The newsletter is distributed free throughout the United States to farmers, ranchers, Cooperative Extension agents, educators and others interested in sustainable agriculture. ATTRA is funded through the USDA Rural Business-Cooperative Service and is a project of the National Center for Appropriate Technology (NCAT), a private, non-profit organization that since 1976 has helped people by championing small-scale, local and sustainable solutions to reduce poverty, promote healthy communities, and protect natural resources.
Teresa Maurer, Project Manager
Comments? Questions? Email the ATTRAnews editor Karen Van Epen at firstname.lastname@example.org.
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