Sunday, February 12, 2006

Wind farms conk out in heat wave

The Adelaide (South Australia) Advertiser has a story today about the sorry performance of the state's 180 wind turbines during the January heat wave. Even if there were some wind, many of the turbines shut down because it was too hot. Then one of them caught fire. Although firefighters couldn't do anything about the turbine, at least they were there to put out the spot fires started by falling debris. Imagine such a fire amidst the brush of a remote ridgeline.
A $3 MILLION wind farm turbine caught fire while dozens shut down at the time South Australia most needed them -- when a heatwave left 63,000 South Australian homes without power last month.

Adding to the drama, firefighters could not extinguish the blaze because the tower was too high at 67m [220ft].

Lack of wind and automatic shutdowns triggered by hot temperatures were to blame for the state's 180 turbines producing just 10 per cent of their maximum power capacity during the January heat wave, according to experts.

The experience proved SA could not rely on wind power to provide electricity when demand was greatest, the Electricity Supply Industry Planning Council (ESIPC) said.

"You never know if the wind will be blowing when you need it to or if wind turbines will shut down," ESIPC spokesman Brad Cowain said.

Operators of the Lake Bonney wind farm, where the turbine fire occurred on Sunday, January 22, said all of its 46 turbines had automatically shut down during the heat wave when temperatures exceeded 40C [104F].

... [Wind farm operator Miles George of Babcock and Brown Wind Partners] said the turbine fire ... had been caused by an electrical fault while maintenance crews were working on it after it had shut down.

Around 3pm, 40 CFS firefighters and six trucks rushed to the wind farm to extinguish the blaze but fire hose water couldn't reach the steel generator at the top of the tower.

Instead, the firefighters watched as fire destroyed the $3 million turbine – which weighs 75 tonnes -- and extinguished spot fires ignited by ashes from the turbine blaze.

... [D]uring Saturday's peak power demand wind farm output plummeted to just 2 per cent of capacity, producing enough power for only 3500 homes, according to ESIPC. This compared with the maximum capacity of 318MW to power 175,000 homes. SA leads the nation in wind farm energy with five established sites -- Starfish Hill, Canunda, Wattle Point, Cathedral Rocks and Lake Bonney.

There are numerous other approved wind farm developments including an AGL plan for 43 turbines at Hallet in the state's Mid North.

But AGL also plans to more than double the capacity of its nearby gas-fired plant, from 180MW to 430MW, at a cost of more than $100 million to ensure peak demand during hot weather can be met.
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