This blog will cover some news items related to Sustainability: Corporate Social Responsibility, Stewardship, Environmental management, etc.


Wind Power 101: A primer on wind power

For some of you, this is old news. But for people like me, it's a useful reference :-)

How Wind Power Works
by Julia Layton

wind turbines

It's hard sometimes to imagine air as a fluid. It just seems so ... invisible. But air is a fluid like any other except that its particles are in gas form instead of liquid. And when air moves quickly, in the form of wind, those particles are moving quickly. Motion means kinetic energy, which can be captured, just like the energy in moving water can be captured by the turbine in a hydroelectric dam. In the case of a wind-electric turbine, the turbine blades are designed to capture the kinetic energy in wind. The rest is nearly identical to a hydroelectric setup: When the turbine blades capture wind energy and start moving, they spin a shaft that leads from the hub of the rotor to a generator. The generator turns that rotational energy into electricity. At its essence, generating electricity from the wind is all about transferring energy from one medium to another.

Wind farm next door?
Would you live near a wind farm?

Tell us why or why not.

Wind power all starts with the sun. When the sun heats up a certain area of land, the air around that land mass absorbs some of that heat. At a certain temperature, that hotter air begins to rise very quickly because a given volume of hot air is lighter than an equal volume of cooler air. Faster-moving (hotter) air particles exert more pressure than slower-moving particles, so it takes fewer of them to maintain the normal air pressure at a given elevation (see How Hot Air Balloons Work to learn more about air temperature and pressure). When that lighter hot air suddenly rises, cooler air flows quickly in to fill the gap the hot air leaves behind. That air rushing in to fill the gap is wind.

Thank You

Thanks to Willy Cheng for his assistance with this article.

If you place an object like a rotor blade in the path of that wind, the wind will push on it, transferring some of its own energy of motion to the blade. This is how a wind turbine captures energy from the wind. The same thing happens with a sail boat. When moving air pushes on the barrier of the sail, it causes the boat to move. The wind has transferred its own energy of motion to the sailboat.

The simplest possible wind-energy turbine consists of three crucial parts:

  • Rotor blades - The blades are basically the sails of the system; in their simplest form, they act as barriers to the wind (more modern blade designs go beyond the barrier method). When the wind forces the blades to move, it has transferred some of its energy to the rotor.
  • Shaft - The wind-turbine shaft is connected to the center of the rotor. When the rotor spins, the shaft spins as well. In this way, the rotor transfers its mechanical, rotational energy to the shaft, which enters an electrical generator on the other end.
  • Generator - At its most basic, a generator is a pretty simple device. It uses the properties of electromagnetic induction to produce electrical voltage – a difference in electrical charge. Voltage is essentially electrical pressure – it is the force that moves electricity, or electrical current, from one point to another. So generating voltage is in effect generating current. A simple generator consists of magnets and a conductor. The conductor is typically a coiled wire. Inside the generator, the shaft connects to an assembly of permanent magnets that surrounds the coil of wire. In electromagnetic induction, if you have a conductor surrounded by magnets, and one of those parts is rotating relative to the other, it induces voltage in the conductor. When the rotor spins the shaft, the shaft spins the assembly of magnets, generating voltage in the coil of wire. That voltage drives electrical current (typically alternating current, or AC power) out through power lines for distribution. (See How Electromagnets Work to learn more about electromagnetic induction, and see How Hydropower Plants Work to learn more about turbine-driven generators.)
Now that we've looked at a simplified system, we'll move on to the modern technology you see in wind farms and rural backyards today. It's a bit more complex, but the underlying principles are the same.

History of Wind Energy

Pitstone Windmill
Photo courtesy
Photographer: Michael Reeve

Pitstone Windmill, believed to be the oldest windmill in the British Isles

As early as 3000 B.C., people used wind energy for the first time in the form of sail boats in Egypt. Sails captured the energy in wind to pull a boat across the water. The earliest windmills, used to grind grain, came about either in 2000 B.C. in ancient Babylon or 200 B.C. in ancient Persia, depending on who you ask. These early devices consisted of one or more vertically-mounted wooden beams, on the bottom of which was a grindstone, attached to a rotating shaft that turned with the wind. The concept of using wind energy for grinding grain spread rapidly through the Middle East and was in wide use long before the first windmill appeared in Europe. Starting in the 11th century B.C., European Crusaders brought the concept home with them, and the Dutch-type windmill most of us are familiar with was born.

Modern development of wind-energy technology and applications was well underway by the 1930s, when an estimated 600,000 windmills supplied rural areas with electricity and water-pumping services. Once broad-scale electricity distribution spread to farms and country towns, use of wind energy in the United States started to subside, but it picked up again after the U.S. oil shortage in the early 1970s. Over the past 30 years, research and development has fluctuated with federal government interest and tax incentives. In the mid-'80s, wind turbines had a typical maximum power rating of 150 kW. In 2006, commercial, utility-scale turbines are commonly rated at over 1 MW and are available in up to 4 MW capacity.

Modern Wind-power Technology
When you talk about modern wind turbines, you're looking at two primary designs: horizontal-axis and vertical-axis. Vertical-axis wind turbines (VAWTs) are pretty rare. The only one currently in commercial production is the Darrieus turbine, which looks kind of like an egg beater.

Vertical-axis wind turbines
Photo courtesy
NREL (left) and Solwind Ltd
Vertical-axis wind turbines (left: Darrieus turbine)

Wind farm next door?
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Tell us why or why not.

In a VAWT, the shaft is mounted on a vertical axis, perpendicular to the ground. VAWTs are always aligned with the wind, unlike their horizontal-axis counterparts, so there's no adjustment necessary when the wind direction changes; but a VAWT can't start moving all by itself -- it needs a boost from its electrical system to get started. Instead of a tower, it typically uses guy wires for support, so the rotor elevation is lower. Lower elevation means slower wind due to ground interference, so VAWTs are generally less efficient than HAWTs. On the upside, all equipment is at ground level for easy installation and servicing; but that means a larger footprint for the turbine, which is a big negative in farming areas.

illustration of a Darrieus-design VAWT
Darrieus-design VAWT

VAWTs may be used for small-scale turbines and for pumping water in rural areas, but all commercially produced, utility-scale wind turbines are horizontal-axis wind turbines (HAWTs).

a wind farm in California
Photo courtesy
GNU; Photographer: Kit Conn
Wind farm in California

As implied by the name, the HAWT shaft is mounted horizontally, parallel to the ground. HAWTs need to constantly align themselves with the wind using a yaw-adjustment mechanism. The yaw system typically consists of electric motors and gearboxes that move the entire rotor left or right in small increments. The turbine's electronic controller reads the position of a wind vane device (either mechanical or electronic) and adjusts the position of the rotor to capture the most wind energy available. HAWTs use a tower to lift the turbine components to an optimum elevation for wind speed (and so the blades can clear the ground) and take up very little ground space since almost all of the components are up to 260 feet (80 meters) in the air.

Large HAWT components:

  • rotor blades - capture wind's energy and convert it to rotational energy of shaft
  • shaft - transfers rotational energy into generator
  • nacelle - casing that holds:
    • gearbox - increases speed of shaft between rotor hub and generator
    • generator - uses rotational energy of shaft to generate electricity using electromagnetism
    • electronic control unit (not shown) - monitors system, shuts down turbine in case of malfunction and controls yaw mechanism
    • yaw controller (not shown) - moves rotor to align with direction of wind
    • brakes - stop rotation of shaft in case of power overload or system failure
    • tower - supports rotor and nacelle and lifts entire setup to higher elevation where blades can safely clear the ground
    • electrical equipment - carries electricity from generator down through tower and controls many safety elements of turbine
    From start to finish, the process of generating electricity from wind -- and delivering that electricity to people who need it -- looks something like this:


    Unlike the old-fashioned Dutch windmill design, which relied mostly on the wind's force to push the blades into motion, modern turbines use more sophisticated aerodynamic principles to capture the wind's energy most effectively. The two primary aerodynamic forces at work in wind-turbine rotors are lift, which acts perpendicular to the direction of wind flow; and drag, which acts parallel to the direction of wind flow.

    an illustration of turbine aerodynamics

    Turbine blades are shaped a lot like airplane wings -- they use an airfoil design. In an airfoil, one surface of the blade is somewhat rounded, while the other is relatively flat. Lift is a pretty complex phenomenon and may in fact require a Ph.D. in math or physics to fully grasp. But in one simplified explanation of lift, when wind travels over the rounded, downwind face of the blade, it has to move faster to reach the end of the blade in time to meet the wind travelling over the flat, upwind face of the blade (facing the direction from which the wind is blowing). Since faster moving air tends to rise in the atmosphere, the downwind, curved surface ends up with a low-pressure pocket just above it. The low-pressure area sucks the blade in the downwind direction, an effect known as "lift." On the upwind side of the blade, the wind is moving slower and creating an area of higher pressure that pushes on the blade, trying to slow it down. Like in the design of an airplane wing, a high lift-to-drag ratio is essential in designing an efficient turbine blade. Turbine blades are twisted so they can always present an angle that takes advantage of the ideal lift-to-drag force ratio. See How Airplanes Work to learn more about lift, drag and the aerodynamics of an airfoil.

    Aerodynamics is not the only design consideration at play in creating an effective wind turbine. Size matters -- the longer the turbine blades (and therefore the greater the diameter of the rotor), the more energy a turbine can capture from the wind and the greater the electricity-generating capacity. Generally speaking, doubling the rotor diameter produces a four-fold increase in energy output. In some cases, however, in a lower-wind-speed area, a smaller-diameter rotor can end up producing more energy than a larger rotor because with a smaller setup, it takes less wind power to spin the smaller generator, so the turbine can be running at full capacity almost all the time. Tower height is a major factor in production capacity, as well. The higher the turbine, the more energy it can capture because wind speeds increase with elevation increase -- ground friction and ground-level objects interrupt the flow of the wind. Scientists estimate a 12 percent increase in wind speed with each doubling of elevation.

    To calculate the amount of power a turbine can actually generate from the wind, you need to know the wind speed at the turbine site and the turbine power rating. Most large turbines produce their maximum power at wind speeds around 15 meters per second (33 mph). Considering steady wind speeds, it's the diameter of the rotor that determines how much energy a turbine can generate. Keep in mind that as a rotor diameter increases, the height of the tower increases as well, which means more access to faster winds.

    Rotor Size and Maximum Power Output
    Rotor Diameter (meters)
    Power Output (kW)
    Sources: Danish Wind Industry Association, American Wind Energy Association

    At 33 mph, most large turbines generate their rated power capacity, and at 45 mph (20 meters per second), most large turbines shut down. There are a number of safety systems that can turn off a turbine if wind speeds threaten the structure, including a remarkably simple vibration sensor used in some turbines that basically consists of a metal ball attached to a chain, poised on a tiny pedestal. If the turbine starts vibrating above a certain threshold, the ball falls off the pedestal, pulling on the chain and triggering a shut down.

    Probably the most commonly activated safety system in a turbine is the "braking" system, which is triggered by above-threshold wind speeds. These setups use a power-control system that essentially hits the brakes when wind speeds get too high and then "release the brakes" when the wind is back below 45 mph. Modern large-turbine designs use several different types of braking systems:

    • Pitch control - The turbine's electronic controller monitors the turbine's power output. At wind speeds over 45 mph, the power output will be too high, at which point the controller tells the blades to alter their pitch so that they become unaligned with the wind. This slows the blades' rotation. Pitch-controlled systems require the blades' mounting angle (on the rotor) to be adjustable.
    • Passive stall control - The blades are mounted to the rotor at a fixed angle but are designed so that the twists in the blades themselves will apply the brakes once the wind becomes too fast. The blades are angled so that winds above a certain speed will cause turbulence on the upwind side of the blade, inducing stall. Simply stated, aerodynamic stall occurs when the blade's angle facing the oncoming wind becomes so steep that it starts to eliminate the force of lift, decreasing the speed of the blades.
    • Active stall control - The blades in this type of power-control system are pitchable, like the blades in a pitch-controlled system. An active stall system reads the power output the way a pitch-controlled system does, but instead of pitching the blades out of alignment with the wind, it pitches them to produce stall.
    (See Petester's Basic Aerodynamics for a nice explanation of both lift and still.)

    Globally, at least 50,000 wind turbines are producing a total of 50 billion kilowatt-hours (kWh) annually. In the next section, we'll examine the availability of wind resources and how much electricity wind turbines can actually produce.

    Wind-power Resources and Economics
    On a global scale, wind turbines are currently generating about as much electricity as eight large
    nuclear power plants. That includes not only utility-scale turbines, but also small turbines generating electricity for individual homes or businesses (sometimes used in conjunction with photovoltaic solar energy). A small, 10-kW-capacity turbine can generate up to 16,000 kWh per year, and a typical U.S. household consumes about 10,000 kWh in a year.

    a residential wind turbine and a utility-scale wind turbine
    Photo courtesy
    NREL (left) and stock.xchng
    Residential wind turbine (left) and utility-scale wind turbine

    A Watt?
    • Watt (W) - electricity-generating capacity
    1 megawatt (MW, 1 million watts) of wind power can produce from 2.4 million to 3 million kilowatt-hours of electricity in one year.
    • Kilowatt-hour (kWh) - one kilowatt (kW, 1,000 watts) of electricity generated or consumed in one hour
    See How Electricity Works to learn more.

    A typical large wind turbine can generate up to 1.8 MW of electricity, or 5.2 million KWh annually, under ideal conditions -- enough to power nearly 600 households. Still, nuclear and coal power plants can produce electricity cheaper than wind turbines can. So why use wind energy? The two biggest reasons for using wind to generate electricity are the most obvious ones: Wind power is clean, and it's renewable. It doesn't release harmful gases like CO2 and nitrogen oxides into the atmosphere the way coal does (see How Global Warming Works), and we are in no danger of running out of wind anytime soon. There is also the independence associated with wind energy, as any country can generate it at home with no foreign support. And a wind turbine can bring electricity to remote areas not served by the central power grid.

    But there are downsides, too. Wind turbines can't always run at 100 percent power like many other types of power plants, since wind speeds fluctuate. Wind turbines can be noisy if you live close to a wind plant, they can be hazardous to birds and bats, and in hard-packed desert areas there is a risk of land erosion if you dig up the ground to install turbines. Also, since wind is a relatively unreliable source of energy, operators of wind-power plants have to back up the system with a small amount of reliable, non-renewable energy for times when wind speeds die down. Some argue that the use of unclean energy to support the production of clean energy cancels out the benefits, but the wind industry claims that the amount of unclean energy that's necessary to maintain a steady supply of electricity in a wind system is far too small to defeat the benefits of generating wind power.

    Wind farm next door?
    Would you live near a wind farm?

    Tell us why or why not.

    Potential disadvantages aside, the United States has a good number of wind turbines installed, totaling more than 9,000 MW of generating capacity in 2006. That capacity generates in the area of 25 billion kWh of electricity, which sounds like a lot but is actually less than 1 percent of the power generated in the country each year. As of 2005, U.S. electricity generation breaks down like this:

    • Coal: 52%
    • Nuclear: 20%
    • Natural gas: 16%
    • Hydropower: 7%
    • Other (including wind, biomass, geothermal and solar): 5%
    Source: American Wind Energy Association

    The current total electricity generation in the United States is in the area of 3.6 trillion kWh every year. Wind has the potential to generate far more than 1 percent of that electricity. According to American Wind Energy Association, the estimated U.S. wind-energy potential is about 10.8 trillion kWh per year -- about equal to the amount of energy in 20 billion barrels of oil (the current global yearly oil supply). To make wind energy feasible in a given area, it requires minimum wind speeds of 9 mph (3 meters per second) for small turbines and 13 mph (6 meters per second) for large turbines. Those wind speeds are common in the United States, although most of it is unharnessed.

    map of wind strength in the United States

    When it comes to wind turbines, placement is everything. Knowing how much wind an area has, what the speeds are and how long those speeds last are the crucial deciding factors in building an efficient wind farm. The kinetic energy in wind increases exponentially in proportion to its speed, so a small increase in wind speed is in fact a large increase in power potential. The general rule of thumb is that with a doubling a wind speed comes an eight-fold increase in power potential. So theoretically, a turbine in an area with average wind speeds of 26 mph will actually generate eight times more electricity than one set up where wind speeds average 13 mph. It's "theoretically" because in real-world condition, there is a limit to how much energy a turbine can extract from the wind. It's called the Betz limit, and it's about 59 percent. But a small increase in wind speed still leads to a significant increase in power output.

    Photo courtesy
    General Electric Company
    Raheenleagh wind farm

    As in most other areas of power production, when it comes to capturing energy from the wind, efficiency comes in large numbers. Groups of large turbines, called wind farms or wind plants, are the most cost-efficient use of wind-energy capacity. The most common utility-scale wind turbines have power capacities between 700 KW and 1.8 MW, and they're grouped together to get the most electricity out of the wind resources available. They are typically spaced far apart in rural areas with high wind speeds, and the small footprint of HAWTs means that agricultural use of the land in nearly unaffected. Wind farms have capacities ranging anywhere from a few MW to hundreds of MW. The world’s largest wind plant is the Raheenleagh Wind Farm located off the coast of Ireland. At full capacity (it's currently operating at partial capacity), it will have 200 turbines, a total power rating of 520 MW and cost nearly $600 million to build.

    The cost of utility-scale wind power has come down dramatically in the last two decades due to technological and design advancements in turbine production and installation. In the early 1980s, wind power cost about 30 cents per kWh. In 2006, wind power costs as little as 3 to 5 cents per kWh where wind is especially abundant. The higher the wind speed over time in a given turbine area, the lower the cost of the electricity that turbine produces. On average, the cost of wind power is about 4 to 10 cents per kWh in the United States.

    Energy Costs Comparison
    Resource Type
    Average Cost (cents per kWh)
    Natural gas
    Hydrogen fuel cell
    Sources: American Wind Energy Association, Wind Blog, Stanford School of Earth Sciences

    Many large energy companies offer "green pricing" programs that let customers pay more per kWh to use wind energy instead of energy from "system power," which is the pool of all of the electricity produced in the area, renewable and non-renewable. If you choose to purchase wind energy and you live in the general vicinity of a wind farm, the electricity you use in your home might actually be wind-generated; more often, the higher price you pay goes to support the cost of wind energy, but the electricity you use in your home still comes from system power. In states where the energy market has been deregulated, consumers may be able to purchase "green electricity" directly from a renewable-energy provider, in which case the electricity they're using in their homes definitely does come from wind or other renewable sources.

    Implementing a small wind turbine system for your own needs is one way to guarantee that the energy you use is clean and renewable. A residential or business turbine setup can cost anywhere from $5,000 to $80,000. A large-scale setup costs a whole lot more. A single, 1.8-MW turbine can run up to $1.5 million installed, and that's not including the land, transmission lines and other infrastructure costs associated with a wind-power system. Overall, wind farms cost in the area of $1,000 per kW of capacity, so a wind farm consisting of seven 1.8-MW turbines runs about $12.6 million. The "payback time" for a large wind turbine -- the time it takes to generate enough electricity to make up for its construction, installation and operation costs -- is about three to eight months, according to the American Wind Energy Association. Government incentives for both large- and small-scale producers contribute to that relatively short payback time. Just a few of the current economic incentive programs for renewable energy systems include:

    • Production Tax Credit: Basically, wind-power generators, usually businesses, receive 1.8 cents (as of Dec. 2005) per kWh of wind energy produced for wholesale distribution during the first 10 years the wind farm is up and running.
    • Net metering - In this system, individuals and businesses producing renewable energy receive credits for each kWh they produce beyond their own needs. When someone produces more electricity than he needs, his power meter runs backwards, sending that excess electricity to the power grid. He receives credits for the electricity he sends to the grid, which count as payment toward any electricity he draws from the grid when his turbine can't provide enough power for his home or business. (Many large energy companies don't much care for this setup since they are essentially purchasing the individual producer's wind power at retail price instead of the wholesale price they'd be paying a wind farm.)
    • Renewable-energy credits - Many states now have renewable-energy quotas for power companies, whereby those companies have to buy a certain percentage of their electricity from renewable sources. If someone with his own turbine lives in a state that has a "green credit program," he receives tradable credits for each megawatt-hour of renewable energy he produces in a year. He can then sell those credits to large, conventional-energy companies looking to meet their state or federal renewable-energy quota.
    • Installation tax credits: The federal government and some states offer tax credits for the costs of setting up a renewable-energy system. Maryland, for instance, offers businesses or landlords a credit for 25 percent of the cost of purchasing and installing a wind-turbine system if the energy-supplied building meets certain overall "green criteria."
    While wind energy is still subsidized by the government, it is currently a competitive product and, by most accounts, can stand on its own as a viable power source. The Battelle Pacific Northwest Laboratory, a U.S. Department of Energy science and technology lab, estimates that wind power is capable of supplying 20 percent of the United States' electricity based on wind resources alone. The American Wind Energy Association puts that number at a theoretical 100 percent. Whichever estimate is right, the United States probably won't be seeing those percentages anytime soon. The American Wind Energy Association projects that by 2020, wind will provide 6 percent of all U.S. electricity. While the United States has one of the largest installed wind-power bases in the world in terms of sheer wattage, percentage-wise, it is lagging behind other developed countries. The United Kingdom has a stated goal of 10 percent wind power by 2010. Germany currently generates 8 percent of its power from wind, and Spain is at 6 percent. Denmark, the world leader in clean-energy consumption, gets more than 20 percent of its electricity from wind.

    For more information on wind power and related topics, check out the links on the next page.

    Lots More Information

    Related HowStuffWorks Articles

    More Great Links



Companies Tapping New Markets by Becoming More Environmentally Conscious

Thanks to Susan for this one

Sustainability Can Pay Off In Bottom Line

Companies Tapping New Markets by Becoming More Environmentally Conscious


Simplers Botanical Co. is both financially viable and environmentally conscious.

It sources organic oils and herbs, and ships its natural products in recycled cardboard using biodegradable packing material.

The small Sebastopol company shares more in common with Sonoma County's largest high-tech company than you might think.

Like Simplers, Agilent Technologies Inc. is finding it pays be environmentally friendly. Agilent recycles 80 percent of its waste and reuses 60 percent of wastewater generated in its manufacturing processes. To reduce electricity demand, Agilent runs energy-efficient chillers that cool rooms and water at its Santa Rosa facility.

Despite their contrasts, both businesses are making strides toward sustainability by limiting demand on natural resources and reducing waste. And they are profitable.

"The difference between sustainability and environmentalism is in environmentalism we're concerned about the planet. To be effective, especially in business, you also have to be concerned about your employees, your customers, your suppliers, your neighbors and your stockholders," said Jerrell Richer, a Sonoma State University assistant professor specializing in environmental and natural resource economics.

Business owners, nonprofit groups and others hoping to tap a burgeoning marketplace for environmentally sustainable goods will gather in Rohnert Park on Friday for Northern California's first Sustainable Enterprise Conference.

Sonoma State University and New College of California have joined to lead the conference featuring educators, business owners and environmental consultants. They will discuss strategies and explain tools.

"When you're reducing waste, you're often reducing costs. You're actually becoming more profitable. And there's all sorts of sales drivers because there's a market for environmentally responsible products," said John Stayton, director of the Green MBA Program at New College of California's campus in Santa Rosa.

This approach to capitalism is emerging as more businesses recognize both the opportunities and challenges to manage resources without sacrificing the bottom line.

"There's a lot of evidence that not only is there a better way, but industries that are sustainable are some of the fastest-growing industries in the world," Stayton said.

Organic foods have led the way, but other industries are breaking out with sustainable businesses including consumer goods such as clothing and paper products, and construction.

"It's a fast-growing business model," said Jim Williams, managing partner for Simplers Botanical.

The company sells essential oils and liquid herbal extracts through merchants in more than 20 states. Established in 1981 by James and Mindy Green, business began to take off several years ago.

Today, revenues are growing about 25 percent annually. Simplers just moved into a larger building and could triple production, Williams said.

Improved sales are partly a result of greater consumer interest in the use of oils and herbs in therapeutic treatments for dozens of common ailments.

Simplers also has established a reputation for its sustainable practices and raises awareness about conservation in its marketing.

All Simplers products are plant-based and some 90 percent are organic.

Oils come from independent distilleries and farmers primarily in France, Madagascar and Morocco, though Simplers has a few U.S. suppliers.

Simplers buys raw herbs mostly from an Oregon farm. Herb growers in the Sonoma County Herb Exchange are another source.

By purchasing Simplers products, consumers are helping support organic farmers around the world.

"Initially we promote it because it's a really good thing to do," Williams said. "Our main focus has always been about educating people about herbs. We try not to use hyperbole in our marketing and say 'this is going to cure that.'"

Consumers looking over Simplers product displays also might notice brochures for United Plant Savers. The nonprofit organization raises awareness of endangered plant species with a goal of ensuring a renewable supply.

Conserving water and reducing waste in its manufacturing processes doesn't help sell products, but it's the right thing to do and saves money, Williams said.

Several years ago, Simplers converted from plastic to cardboard in its shipping packages because plastics are made with petroleum, a non-renewable resource, and cardboard includes recycled material. And the company uses corn starch-based packing material because it is biodegradable and doesn't fill up landfills.

Treating natural resources as scarce and valuable commodities is a core approach to making businesses more sustainable.

Businesses increasingly are attempting to conserve energy, driven by rising costs for electricity and natural gas.

Agilent, the county's largest technology company, invests in conservation programs that have a financial payback.

"Being environmentally sound in your business practices is good for the bottom line," said Jeff Weber, a company spokesman.

Agilent has replaced eight massive chillers used for specialized air conditioning for clean rooms and to cool water for machines. Each cost $50,000 to $400,000, depending on a unit's energy efficiency rating. The energy savings will allow the company to recoup its investment within an average of three years.

The new chillers also don't contain ozone-depleting chemicals.

About 60 percent of water used in processing is reused for landscape irrigation and in cooling towers. As a result, Agilent saves about $200,000 in annual water purchases.

Agilent has improved its local waste diversion from 62 percent to 80 percent over four years. Those efforts earned Agilent an award last year from the California Integrated Waste Management Board, one of five businesses statewide to be recognized.

"We're always pushing to do more," said Mike Dittmore, who oversees recycling for Agilent. "The challenge we're always facing is the education. And at the same time you have to make it simple. It has to be convenient."

Education is the goal of this week's conference.

"We're going to be teaching about tools that people can use," Richer said.

Workshops will cover areas including sustainable concepts, supply chains, alternative energy, reducing greenhouse gases, and reaching consumers.

One session features Paul Dolan making the business case for sustainability. Dolan, a partner in Mendocino Wine Co. in Ukiah, was a pioneer in sustainable grape growing and winemaking and helped create the industry's best practices code.

The conference concludes with a panel discussion with business owners and representatives discussing ways to use fewer resources and generate less waste, as well as the startup of successful companies.

For more information on the conference, call 829-8454.

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