• Wild Winds

    The Lake Turkana Wind Power project will be the largest wind farm in Sub-Saharan Africa.

    Photograph by Donna Gehl, MyShot

    Whipping Wind
    The average wind speed at the site of the Lake Turkana Wind Power project is 42.5 kilometers (26.4 miles) per hour.

    Renewable Nation
    Currently, more than half of Kenya's electricity is generated by hydroelectric plants. Like wind, hydroelectric power is a "clean," renewable source of energy. Most of Kenya's hydroelectricity is harvested from dams on the Tana River.

    They Know Windmills
    The Lake Turkana Wind Power project is led by a team of Dutch entrepreneurs and engineers.

    By Stuart Thornton

    Wednesday, April 4, 2012

    For millions of years, fierce winds have ripped across a remote region just southeast of Lake Turkana, Kenya. Now, a consortium known as Lake Turkana Wind Power (LTWP) is preparing to build a massive wind farm—365 wind turbines on 40,000 acres of land—that would use the area's constant winds to generate electricity for the African nation. It would be the largest single wind farm in Sub-Saharan Africa.

    Carlo Van Wageningen, LTWP's chairman and one of its founders, says the Lake Turkana site has what he calls "a special wind."

    "The wind in this part of the world blows always from the same direction," he says. "It's very consistent and very predictable."

    The landscape and geography of the site is what causes the special winds. The area's daily temperature changes create strong, predictable wind streams that travel between Lake Turkana and the desert hinterland.

    "Our particular location is between two high-range mountains in northern Kenya," Van Wageningen says. "One is called Mount Kulal, which is about 30 kilometers [18.64 miles] from the east shore of Lake Turkana. And the other mountain is Mount Nyiru, which is on the south side of the lake, close to the southern tip of the lake. Those two mountains and our location between those two mountains create a Venturi effect, because the wind is compressed between these two mountains and we get a high acceleration of that wind."

    (The Venturi effect describes the process of a fluid, such as air, speeding up (accelerating) as it moves through a narrow or restricted area. As Van Wageningen explains, in the case of the LTWP wind farm, air (wind) is forced into the narrow space between Mount Kulal and Mount Nyiru.)

    Van Wageningen says he has encountered the wind first-hand.

    "If you are sleeping in the only lodge that is available there, which is a very basic lodging, it is a very hot place so you have to keep the windows open," he says. "When that wind blows, the curtain at the window literally stands horizontal and even beats against the ceiling. You feel as if the roof is about to take off and be removed from the ceiling. It’s quite an experience."

    Van Wageningen says he first heard about the winds in that region of Kenya from Willem Dolleman, a partner in LTWP.

    "In the mid '80s, he used to go to that site for sport fishing, and he was always baffled by the amount of wind that was present every time he went," Van Wageningen says.

    Dolleman said the wind was so impressive that something should be done with it. But it wasn't until 2004-2005, when oil prices surged and wind technology had improved, that the site was seriously considered for a wind farm. In 2006, wind data were collected. In 2009, discussions with the Kenyan government finally began.

    Environment and Ecology

    The site appears to be infrequently used by the local population. This is an added benefit, according to Van Wageningen, because a wind farm would not significantly disrupt local inhabitants.

    "There is very little nomadic activities," he says. "There are four or five different tribes who cross the land looking for some bushes and things for their goats and camels."

    One concern about the LTWP project is that nearby Lake Turkana is a major stopover for migrant waterfowl, including pelicans, flamingos, herons, and storks. Van Wageningen says extensive ornithological studies have shown that the wind farm is 15 kilometers (9.32 miles) away from principal migration routes. In addition, LTWP will employ a full-time environmental specialist to monitor and report on any impacts to birds in the area.

    Construction Challenges

    The remote location of the wind farm has made one aspect of construction difficult.

    "The biggest challenge for us has been resolving—at least from a study point of view—the logistics and the ability of getting that very heavy and bulky equipment to site," Van Wageningen says. "We are going to have to upgrade or build about 205 kilometers [127.38 miles] of road. The nearest power grid connection point is 428 kilometers [265.95 miles] away, so we have to erect a high-tension transmission line for 428 kilometers to connect it to the national grid."

    Being far from a developed area has also dictated the kind of equipment used at the wind farm site. LTWP decided to install 365 smaller-sized turbines rather than larger models, for instance.

    "We couldn't use larger turbines, because of the logistical complications," Van Wageningen says. "We would not have been able to get them up there."

    Van Wageningen believes the wind farm will bring positive change to the Lake Turkana area. The project will employ about 2,500 people, mainly from the surrounding area, during construction. In addition, LTWP is planning on devoting all carbon credits from the project to economic development projects in the area of the wind farm and along the transmission line route.

    "We obviously have a very important social responsibility there," Van Wageningen says. "We will devote a considerable amount of our profits as well toward improving the livelihood of the local population."

    Van Wageningen says LTWP will help build schools and health clinics in the region, as well as bring electricity to remote villages.

    "We are going to build transmission lines to bring electricity to those areas that have never seen electricity before," he says, including the villages of Loyangalani, South Horr, Gatab, Sirima, and Kargi.

    Construction of LTWP's wind farm is scheduled to begin in spring or summer 2012. Owners estimate it will be operational in 2014 and ultimately account for 20 percent of Kenya’s total power capacity.

  • Term Part of Speech Definition Encyclopedic Entry
    accelerate Verb

    to increase speed.

    baffle Verb

    to confuse and frustrate.

    capacity Noun

    ability.

    carbon credit Noun

    permit issued by a government that gives an individual or group (usually a company) the right to emit a specific amount of carbon compounds into the atmosphere. Carbon credits can be sold if the amount is not reached.

    compress Verb

    to press together in a small space.

    consortium Noun

    association or group.

    data Plural Noun

    (singular: datum) information collected during a scientific study.

    desert Noun

    area of land that receives no more than 25 centimeters (10 inches) of precipitation a year.

    Encyclopedic Entry: desert
    disrupt Verb

    to interrupt.

    electricity Noun

    set of physical phenomena associated with the presence and flow of electric charge.

    equipment Noun

    tools and materials to perform a task or function.

    geography Noun

    study of places and the relationships between people and their environments.

    Encyclopedic Entry: geography
    government Noun

    system or order of a nation, state, or other political unit.

    hinterland Noun

    area outside an urban center which often supplies the goods, services and labor for the urban center.

    lake Noun

    body of water surrounded by land.

    landscape Noun

    the geographic features of a region.

    Encyclopedic Entry: landscape
    lodge Noun

    shelter or residence.

    logistics Noun

    management of the movement of goods and services.

    migration route Noun

    path followed by birds or other animals that migrate regularly.

    monitor Verb

    to observe and record behavior or data.

    mountain Noun

    landmass that forms as tectonic plates interact with each other.

    nomadic Adjective

    having to do with a way of life lacking permanent settlement.

    oil Noun

    fossil fuel formed from the remains of marine plants and animals. Also known as petroleum or crude oil.

    ornithology Noun

    study of the biology and behavior of birds.

    power grid Noun

    network of cables or other devices through which electricity is delivered to consumers. Also called an electrical grid.

    profit Noun

    money earned after production costs and taxes are subtracted.

    region Noun

    any area on the Earth with one or more common characteristics. Regions are the basic units of geography.

    Encyclopedic Entry: region
    sport fishing Noun

    catching fish for competition or recreation.

    surge noun, verb

    sudden, strong movement forward.

    tension Noun

    uncomfortable relationship between two people or groups.

    transmission Noun

    broadcasting of electromagnetic signals, such as radio waves, from a transmitter to a receiver.

    turbine Noun

    machine that captures the energy of a moving fluid, such as air or water.

    Venturi effect Noun

    the decrease in pressure and increase in velocity as a fluid enters a constricted space.

    village Noun

    small human settlement usually found in a rural setting.

    Encyclopedic Entry: village
    waterfowl Noun

    birds that live near the water.

    wind Noun

    movement of air (from a high pressure zone to a low pressure zone) caused by the uneven heating of the Earth by the sun.

    wind farm Noun

    area with a large group of wind turbines, used to generate electric power.

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