How much are wind farms useful to manage wildfires?

[Z0dCHiY8]

The very idea is, to use wind turbines as guardian lines to slow Wildfires.

1. Power of Wind gets reduced (for needful direction) by such guardian lines.
2. Wildfire provides additional electricity.
3. those towers can be geared to spray retardants.
4. prescribed burns becomes more efficient & safe as well.

 

[berkeman]

Welcome to the PF.

Fire breaks are expensive enough to cut. Trying to build windmills in the fire breaks will be much more expensive, obviously. Portable windmills might be a possibility, but there are probably other better approaches to fighting the active wildfires (large air drops, etc.).

Your heart is in the right place, IMO. What reading have you been doing about fighting wildfires? Have you considered joining your local wildland firefighting group to get practical experience?

We have other firefighters/EMS folks here... Paging @anorlunda

EDIT/ADD -- Adding link to a typical wildland firefighting strategy guide...

https://www.coloradofirecamp.com/suppression-tactics/suppression-tactics-guide.pdf

 

[Z0dCHiY8]

@berkeman first of the all thanks for warm welcome :)

Fire breaks are expensive enough to cut. Trying to build windmills in the fire breaks will be much more expensive, obviously. Portable windmills might be a possibility, but there are probably other better approaches to fighting the active wildfires (large air drops, etc.).

the very point is, to integrate wind farms in Forests as stationary objects. So, they will contribute to manage prescribed burns w/ minor risks to explode in Wildfires.

What reading have you been doing about fighting wildfires? Have you considered joining your local wildland firefighting group to get practical experience?

i've lived in the places of Russia, where Wildfires ain't serious trouble. But this topic is curious to me.

 

[berkeman]

the very point is, to integrate wind farms in Forests as stationary objects.

What fundamental engineering problem can you see with building windfarms in forests?

EDIT / ADD -- I meant with "having" not "building"...

 

[Z0dCHiY8]

In fact, Wildfires are the part of the natural cycle for Forests. But we need to adapt cities/towns/etc to that part.

 

[berkeman]

Do you consider the destruction of hundreds of homes per year to be a natural cycle?

 

[Z0dCHiY8]

Do you consider the destruction of hundreds of homes per year to be a natural cycle?

Wildfires had been roaring long before those homes were built. And now the very goal is, to defend those homes from any harm of that natural cycles.

 

[OCR]

. . .there are probably other better approaches to fighting the active wildfires. . .

Copy that. . . . Yes, there are. . .

Willie Fire-Red Lodge, Montana

Your heart is in the right place, IMO.

Yes. . . it's just that the logistics would be so very, very, difficult.

Most Wildland Fires here in Montana are in terrain similar to the above pictures.
Lol. . . yeah, that is me in the dozer. .

.

 

[Z0dCHiY8]

Yes, there are. . .

unfortunately, it's very inefficient methods..

1. aerial attack on Wildfire has severely restricted by volume of retardants, by weather conditions & by landscape as well.
2. boots on the ground act very slowly, crew gets emotionally exhausted, gets a lot of troubles w/ health & put selves at great risk.

 

[berkeman]

unfortunately, it's very inefficient methods..

1. aerial attack on Wildfire has severely restricted by volume of retardants, by weather conditions & by landscape as well.
2. boots on the ground act very slowly, crew gets emotionally exhausted, gets a lot of troubles w/ health & put selves at great risk.

And how many seasons have you been part of your local wildland firefighting crew? Have you completed the Fire Academy yet?

 

[berkeman]

Lol. . . yeah, that is me in the dozer. .

Awesome! Thanks for your very important work, and stay safe brother!

 

[Z0dCHiY8]

And how many seasons have you been part of your local wildland firefighting crew? Have you completed the Fire Academy yet?

Please, let's stay on topic.

 

[Windadct]

Economically or investment wise - these are at two ends of the spectrum. One is a long term infrastructure investment expecting pay off in 10s of years - the other is "insurance" costs needed to ensure resources are standing by the ready for a critical conditions, one ideally generates revenue, and the other protects against loss.

While I would point out that the effort to get "added value" out of ether case (all systems) is a worthwhile study - the cost, in this case of preparing windmills and and the necessary systems to be hardened for and combat fires does not seem like it would be economical. ( Conversely - adding automated IR fire detecting systems to accelerate the response time to fight the fires could be added to windmills and could be very valuable if applied properly - relatively low cost, and high benefit. A relatively quick data study of the number of fires started in areas near wind farms could quickly bear this out - just a thought.)

 

[Z0dCHiY8]

@Windadct Thanks for valuable reply. Actually, in my humble opinion, windmills against Wildfires have two strong pros..

1. it can have retardants on-board, so it can be sprayed around to cool hot ash/embers before that stuff touches dry grass. In other words, spraying can be controlled in online mode w/o any need to have extra crews on the ground.

2. Energy of fires provides additional electricity.

 

[cjl]

What fundamental engineering problem can you see with building windfarms in forests?

EDIT / ADD -- I meant with "having" not "building"...

Although I agree that this isn't a very plausible fire prevention or control method, I suspect you are severely underestimating the size of modern wind turbines with this response.

 

[Windadct]

@Windadct Thanks for valuable reply. Actually, in my humble opinion, windmills against Wildfires have two strong pros..

1. it can have retardants on-board, so it can be sprayed around to cool hot ash/embers before that stuff touches dry grass. In other words, spraying can be controlled in online mode w/o any need to have extra crews on the ground.

2. Energy of fires provides additional electricity.

Again - this is a looks good perhaps in isolation from the real world - but the practicality of it is not there:

1) The cost of putting and maintaining any sufficient retardants (even water) and appropriate application systems in the windmills would be astronomical - and spread over thousands of turbines.
2) Even with fires occurring on an area once every 5 or 10 years - the hardening of the system to survive it is incredibly complex - relative to the benefit. For example - windspeeds during a fire can get well over 50-55 MPH - which is the typical limit for wind turbines, to design the turbines to be able to harvest energy at the higher wind speeds would be also very expensive, and that expense only yields a pay back when the fires occur.The land could be managed and harvested to suppress natural fires - then burned in a wood to steam process or as a heat source (pelletized) far more economically.

A good example of why Engineering curriculum usually have "Engineering Economics" as a requirement.

 

[berkeman]

2. Wildfire provides additional electricity.

Please keep in mind that the current trend is to cut power to areas that are in danger of catching fire (to help prevent AC Mains sparked fires from starting), and during a fire, power is usually cut off anyway.

https://www.pge.com/en_US/safety/em...ildfires/public-safety-power-shutoff-faq.page
https://www.pressdemocrat.com/news/9714669-181/pge-ready-to-cut-power

 

[anorlunda]

Count me as skeptical about this idea.

@Z0dCHiY8 , do a simple experiment. Go to one of those wind farms. Carry a hand-held wind meter. See how much difference in wind speed you will find upwind compared to downwind. I'll wager the difference will be too little to measure.

Other points:

• In a forest with 100 foot trees, the wind turbine towers would need to be 100 feet taller than otherwise. That's a lot of cost.
• Wind farm owners typically have to buy the land or buy an easement for their locations. They would love the idea of free public land. Land preservation advocates would really hate the idea of giving away public land for private profit.
• If a tank of retardant at the top of the tower could be effective and affordable, I think they would already do that to protect their own self interest.
• The ability to make extra electricity for 1 hour out of the life of the turbine is equivalent to your mortgage holder saying that they will give you one hour reduced interest over the life of the loan.

 

[Z0dCHiY8]

1) The cost of putting and maintaining any sufficient retardants (even water) and appropriate application systems in the windmills would be astronomical - and spread over thousands of turbines.
2) Even with fires occurring on an area once every 5 or 10 years - the hardening of the system to survive it is incredibly complex - relative to the benefit. For example - windspeeds during a fire can get well over 50-55 MPH - which is the typical limit for wind turbines, to design the turbines to be able to harvest energy at the higher wind speeds would be also very expensive, and that expense only yields a pay back when the fires occur.

You, right == it's expensive story, but modern trends of Wildfires have put people at two choices..

1. abandon territories.
2. Stand your ground.
=====
https://www.ucsusa.org/global-warmi...cts/infographic-wildfires-climate-change.htmlhttps://earthobservatory.nasa.gov/b...to-know-about-fire-season-in-the-western-u-s/

Please keep in mind that the current trend is to cut power to areas that are in danger of catching fire (to help prevent AC Mains sparked fires from starting), and during a fire, power is usually cut off anyway.

good point, but this problem has solution == power cables get deployed underground.

, do a simple experiment. Go to one of those wind farms. Carry a hand-held wind meter. See how much difference in wind speed you will find upwind compared to downwind. I'll wager the difference will be too little to measure.

at Forest fires, we deal w/ bunch of local winds. They ain't stable by their power & direction. The very goal is to pound the "bad" directions, so it makes fire expansion more slow.

In a forest with 100 foot trees, the wind turbine towers would need to be 100 feet taller than otherwise. That's a lot of cost.

here is curious moment == we have to deal w/ ground winds at range (0-5 meters from the ground). Ground winds have provide the Lion's share of Wildfire speed. at high altitudes, ash/embers lose the most of its temp & have lowest probability to spark new fires.

Wind farm owners typically have to buy the land or buy an easement for their locations. They would love the idea of free public land. Land preservation advocates would really hate the idea of giving away public land for private profit.

i'm not a lawyer to discuss this issue. But i guess it has a lot of solutions :)

If a tank of retardant at the top of the tower could be effective and affordable, I think they would already do that to protect their own self interest.

if one home survives, but entire neighborhood got burnt down to the ground.. it's pointless. + keep in mind, Megafires have provided mudslides.

“When I interviewed the Montecito firefighters they were forthright that they were dealing with trauma, especially from the mudslides that followed the fire. It wasn't something they could prepare for.” That’s a key word: preparation.
https://www.outsideonline.com/2379681/thomas-fire-mystery-ranch

The ability to make extra electricity for 1 hour out of the life of the turbine is equivalent to your mortgage holder saying that they will give you one hour reduced interest over the life of the loan.

lawmaker's issue yet again.

 

[berkeman]

unfortunately, it's very inefficient methods..

And you base this statement on what? You did your best to dodge my question about your training in Fire Science...

And how many seasons have you been part of your local wildland firefighting crew? Have you completed the Fire Academy yet?

Please, let's stay on topic.

We are replying on-topic. You would like to propose a new technique of preparing for wildland fires, and as I said before, that is admirable and your heart is in the right place. Unfortunately, you keep showing that you have no experience or training in Fire Science, Wildland Firefighting, Infrastructure Economics, etc. If you had an unbelievably fantastic new idea, we would say so. But your thought experiment has many flaws that we've been trying to gently point out, and so far you have been rejecting them and trying to keep promoting the flawed concept.

You, right == it's expensive story, but modern trends of Wildfires have put people at two choices..

1. abandon territories.
2. Stand your ground.

Nope. If you had graduated from a Fire Academy or had a background in Fire Science, you would understand how the infrastructure that we use now is the best that we have. And you would be familiar with the next couple of possible technologies that we are working on...

You have received good replies from folks in this thread with experience in Fire Science, EMS and Firefighting (including Wildland Firefighting). I would suggest that the best thing you could do right now is to channel your great enthusiasm and passion into learning more about Fire Science and Wildland Firefighting and keep up with your studies in ME/CE or whatever your school passions are. You may very well come up with some great new firefighting technologies, but tilting at these windmills is a waste of time IMO.

Please stop by your local firehouse to say hi, and ask about the local junior FF volunteer groups and the local Fire Academy. You will find some like minds at your local firehouse...

 

[Z0dCHiY8]

And you base this statement on what? You did your best to dodge my question about your training in Fire Science...

Wildfire's trends are open info & I've used it.

We are replying on-topic. You would like to propose a new technique of preparing for wildland fires, and as I said before, that is admirable and your heart is in the right place. Unfortunately, you keep showing that you have no experience or training in Fire Science, Wildland Firefighting, Infrastructure Economics, etc. If you had an unbelievably fantastic new idea, we would say so. But your thought experiment had many flaws that we've been trying to gently point out, and so far you have been rejecting them and trying to keep promoting the flawed concept.

actually, we have discussed possible technological solutions. Obviously, current windmills ain't suitable for topic. as i said, we need to deal w/ ground gusty winds to manage those fires.

 

[Z0dCHiY8]

curious design, looks to be more suitable for topic :)

 

[DEvens]

Do you consider the destruction of hundreds of homes per year to be a natural cycle?

It's the only way the homecones can open out and release their seeds.

 

[DEvens]

2. Wildfire provides additional electricity.

Um... Don't give my province ideas!

3. those towers can be geared to spray retardants.

So, fire retardant pipelines to wind farms now?

 

[cjl]

Count me as skeptical about this idea.

@Z0dCHiY8 , do a simple experiment. Go to one of those wind farms. Carry a hand-held wind meter. See how much difference in wind speed you will find upwind compared to downwind. I'll wager the difference will be too little to measure.

I honestly couldn't tell you what the wake does at ground level. 100m up though, turbines severely reduce windspeed for distances up to a kilometer or two behind the turbine. This is especially true if the wind speed is around 11-12m/s or lower, where the turbine is operating near its maximum thrust coefficient.

Other points:

• In a forest with 100 foot trees, the wind turbine towers would need to be 100 feet taller than otherwise. That's a lot of cost.

An extra 30m of tower height honestly isn't as much of a deal as you're thinking here. Sure, it adds, cost, but it's absolutely something that is done sometimes. It all depends on the local mean windspeed, the costs, the goals for the power generation, etc. It can even be a good thing in areas with strict noise regulations - the extra tower height plus the trees can help significantly reduce the noise level produced by the turbine compared to a similar one mounted 30 or 40 meters lower in an empty plain.

Also, in general, I think you're underestimating just how large these are. Especially in a forest with shorter trees (say, 10 or 20 meters), the turbine's overall height is barely even affected. Modern turbines use towers in the 60-70 meter range at the lowest, and at the high end, towers as high as 140-180m or so have been done. The trees just really don't provide much impediment when the turbines are that tall.

As for the rest of your points here though:

• Wind farm owners typically have to buy the land or buy an easement for their locations. They would love the idea of free public land. Land preservation advocates would really hate the idea of giving away public land for private profit.
• If a tank of retardant at the top of the tower could be effective and affordable, I think they would already do that to protect their own self interest.
• The ability to make extra electricity for 1 hour out of the life of the turbine is equivalent to your mortgage holder saying that they will give you one hour reduced interest over the life of the loan.

I pretty much agree with everything here. It's not really a viable idea, just not for your initial couple of reasons.

 

[Z0dCHiY8]

It's not really a viable idea, just not for your initial couple of reasons.

You gave curious reply, thanks for. Would you like to share some more details why the idea ain't viable in your understanding?

 

[anorlunda]

100m up though, turbines severely reduce windspeed for distances up to a kilometer or two behind the turbine.

I think you mean they disturb the wind turbulent downwind, not reduce the speed. Disturb means that turbulence makes it move in swirls and eddies.

Simple conservation of mass says that mass flow upwind of the turbine equals mass flow downwind of the turbine. Some of the wind might be deflected sideways. But the air just downwind must move out of the way to allow more air to come in from the upwind side.

 

[cjl]

No, the windspeed is reduced. Conservation of energy requires this, actually, since all the power generated is coming out of the kinetic energy of the wind. Now, what this means from a conservation of mass/continuity standpoint is that the effective region of air affected by the turbine is smaller in diameter than the rotor itself upstream of the turbine, and larger than the rotor downstream of the turbine. As this flows through the turbine, it slows down, but the cross sectional area of the streamtube grows, satisfying continuity but also slowing down. Flow that passes adjacent to the turbine is also deflected away, due to this growth in the diameter of the wake downstream of the turbine (and of course there's also lots of fascinating turbulence and mixing that goes on). In case this explanation isn't very clear, here's a diagram:

At lower wind speeds up to 10 or 11 m/s, as I said, most modern turbines are running an induction of around 0.25-0.3, so the wind speed in the wake might be as low as half (or even a bit below) the freestream value. You can see this very clearly in doppler-measured wind speeds within a wind farm, as seen below:

 

[anorlunda]

No, the windspeed is reduced.

Thanks. I stand corrected.

 

[cjl]

To be fair, fluid flows in general (and wind turbines in particular) aren't the most intuitive things in the world. I do find them fascinating though.

 

[berkeman]

No, the windspeed is reduced.

Wow, thanks. That must make the design of windfarms very challenging. You'd need to factor in the varying typical wind directions and the available land area to try to optimize the number and placement of windmills.

The windfarms around me are in the rolling hills, so it's probably easier to figure out the windmill placements without too much simulation. But if you had to design a windfarm in a large flat area, what an optimization challenge!

Thanks @cjl

https://cached.imagescaler.hbpl.co....ws/OPW/US_AltamontPass-20160311094821447.jpeg

 

[Z0dCHiY8]

That must make the design of windfarms very challenging. You'd need to factor in the varying typical wind directions and the available land area to try to optimize the number and placement of windmills.

very crude truth is, the're no ways to optimize all that. But the're gov programs to fund stuff. wind farms against Wildfires have even more economic reasons to be built. :)

 

[berkeman]

very crude truth is, the're no ways to optimize all that

So you haven't taken calculus yet I'm guessing? Any numerical computing classes? Learned FEA / CFD simulation methods yet?

There are ways to solve and optimize those design issues. They are just not simple.

 

[Z0dCHiY8]

So you haven't taken calculus yet I'm guessing? Any numerical computing classes? Learned FEA / CFD simulation methods yet?

There are ways to solve and optimize those design issues. They are just not simple.

so many curious words :) let's take actual numbers == it's all open info..

The champion: Dudgeon (last 12 months) ==> *** 65.3% ***

Dudgeon: 67 Siemens 6 MW turbines, 32 km offshore Norfolk, operational since October 2017, owners Statoil, Masdar, Statkraft, water depth 18-25 m, rotor axis 110 m, rotor diameter 154 m, nameplate capacity factor 48%
https://deepresource.wordpress.com/2018/09/01/offshore-wind-capacity-factors/

let's compare w/ normal methods..

The simple cycle is simpler but less efficient than the combined cycle. However, simple cycle plants are able to dispatch faster than coal-fired power plants or nuclear plants. This means they can be turned on or off faster in order to meet societies electricity needs.[4] Often needed on the grid with wind power and solar power, its purpose is to meet the fluctuating electricity needs of society, known as peaking power. Combined cycle plants are more efficient because it makes use of the hot exhaust gases that would otherwise be dispelled from the system. These exhaust gases are used to boil water into steam—which can then spin another turbine and generate more electricity. The thermal efficiency of the combined cycle can get up to 60%.[5] Moreover, these plants produce one third of the waste heat of a plant with a 33% efficiency
https://energyeducation.ca/encyclopedia/Natural_gas_power_plant

even simple cycle ones have been needed to smooth unstable production of "green" energy So, efficiency of wind turbine (30%) X capacity factor (60%) == overall efficiency (18%). And it's very good result for "greenies" :)

 

[berkeman]

so many curious words :) let's take actual numbers == it's all open info..

Sorry, but how in the world does your reply address my comment about you saying that there is no way to optimize the layout of a large 2-D windfarm?

very crude truth is, the're no ways to optimize all that.

 

[Z0dCHiY8]

Sorry, but how in the world does your reply address my comment about you saying that there is no way to optimize the layout of a large 2-D windfarm?

what exactly do you want to optimize in wind farm? really :)

 

[berkeman]

what exactly do you want to optimize in wind farm? really :)

Wow, what parts of post #28 and #31 did you not understand? The CFD issues exposed and discussed in those posts are the most interesting parts of this thread so far, no?

 

[Z0dCHiY8]

Wow, what parts of post #28 and #31 did you not understand? The CFD issues exposed and discussed in those posts are the most interesting parts of this thread so far, no?

cfd has so a little w/ your idea about optimization of wind farm :) it's possible to optimize wind turbine for given range of wind speeds, but wind has unstable nature & most share of time turbine runs beyond optimal numbers. strong winds easily can damage turbine. So, only way of real optimization out there is only more & more gov funding.. it's more cool than cfd ("green" energy knows it so well) :)

 

[berkeman]

cfd has so a little w/ your idea about optimization of wind farm :) it's possible to optimize wind turbine for given range of wind speeds, but wind has unstable nature & most share of time turbine runs beyond optimal numbers. strong winds easily can damage turbine. So, only way of real optimization out there is only more & more gov funding.. it's more cool than cfd ("green" energy knows it so well) :)

And what are your thoughts and initial analysis of this image from that part of this thread?

 

[Z0dCHiY8]

And what are your thoughts and initial analysis of this image from that part of this thread?

gas turbine does better :)

 

[cjl]

Wow, thanks. That must make the design of windfarms very challenging. You'd need to factor in the varying typical wind directions and the available land area to try to optimize the number and placement of windmills.

Yeah, it's definitely an interesting problem. The trivial solution is of course to just space them out so they're all ~20 rotor diameters apart, so the wake effect is minimal, but that requires very large amounts of land, and incurs larger cabling and connection costs as well, so it's really not the best solution. In reality, detailed site surveys are done that determine the probability that wind will be coming from various directions, and then you tend to space them further apart in the direction that wind typically blows and closer together perpendicular to that. There's also the terrain effect to consider - you often want to place them up on ridgelines because the wind is more consistent up there, you have to consider where you want them relative to existing roads and infrastructure, and there's even the question of property rights if you're leasing the land from a farmer or something.

 

[cjl]

so many curious words :) let's take actual numbers == it's all open info..

let's compare w/ normal methods..

even simple cycle ones have been needed to smooth unstable production of "green" energy So, efficiency of wind turbine (30%) X capacity factor (60%) == overall efficiency (18%). And it's very good result for "greenies" :)

Why does the efficiency of the wind turbine matter at all? All that should matter is annual energy production and capacity factor (and cost of course - at the end of the day, we're trying for lowest LCOE here). Unlike coal or natural gas, where the effeciency impacts emissions and cost (since you have to buy the fuel), it doesn't matter at all if a wind turbine has to interact with a bit more wind to generate the electricity. In the industry, we generally aren't even trying to maximize efficiency. We're trying to maximize energy production for a given cost and load on the turbine, which usually involves intentionally decreasing the efficiency a bit off of optimum. The question you should be asking is this: what is the total cost of generating a GWh of energy? How does wind compare to solar compare to coal compare to combined cycle? That's what really tells you if they're useful or not.

(Also, for what it's worth, wind turbines are more like 40-45% efficient, but as I said above, it doesn't really matter anyways)

 

[cjl]

And I'm sorry to everyone for the multiple posts in a row here, but I can't just let a post like this go unanswered.

cfd has so a little w/ your idea about optimization of wind farm :)

Interestingly, this part is right. CFD on that kind of scale is just too computationally intensive, so you would usually use simpler models to approximate wake effects, turbulence, etc, and you'd use some kind of a coupled model like `FAST to see how the turbines behave.

it's possible to optimize wind turbine for given range of wind speeds, but wind has unstable nature & most share of time turbine runs beyond optimal numbers.

A wind turbine is designed based on the expected mean wind speed at sites at which it will be installed. Based on site assessments and turbine design, it's pretty easy to predict within a few percent exactly how much energy you expect a given site to make, and when it will be making that energy. The turbines also react to changing wind conditions, so the fact that the wind isn't perfectly steady isn't really a problem.

For a site with a mean wind speed around 9-10 m/s, you'd usually design the turbine to run pitched in all the way, extracting as much power as possible at all wind speeds up to around 12-13m/s. Above that, you hit the so-called "rated power", which is the number you actually see on the turbine brochure. If you see someone advertise a "6MW" turbine, that's the rated power. Above 12-13m/s, the turbine will make full power at all wind speeds up to 20-30m/s (depending on design), and above that will usually ramp down or shut off to protect itself. This also puts the lie to your following statement:

strong winds easily can damage turbine.

It's quite rare for strong winds to damage a modern turbine - there are a number of features in the controller that prevent this.

So, only way of real optimization out there is only more & more gov funding.. it's more cool than cfd ("green" energy knows it so well) :)

As it stands right now, wind energy is perfectly able to compete in many markets and locations with no government subsidy at all. The cost of the turbines has been dropping substantially over the past couple of decades, and the sophistication of the analysis that goes into their design, construction, and siting has drastically increased. It seems very likely to me that wind's share of energy generation will increase substantially through the next several decades.

 

[essenmein]

I would argue that a wind farm likely won't slow down a fire, but could easily make it worse.

Once the flames lick at those lovely flammable composite blades, they'll loose strength, fly off and contribute to the fires fuel.

 

[Z0dCHiY8]

Unlike coal or natural gas, where the effeciency impacts emissions and cost (since you have to buy the fuel)

no gasoline == it's very funny argument from "green" energy supporters. what about hidden usage of gasoline?

1. to build turbines takes gasoline (it takes dramatically less number of gas turbines to provide the same output ).
2. to maintain wind farms takes it yet again.
3. electrical grid becomes larger, more expensive & less reliable.
4. to smooth output == very funny story ;)
5. leads to energy crisis.. deep crisis, because "green" energy is worst of possible options.
==========

We now consider the production of 100 kWh electricity for which wind turbines have been built. After a year it turns out that on average 17,5 kWh have been supplied by wind, and the rest from conventional power plants, effectively serving as back-up. Assuming that these conventional plants delivered under optimum conditions, this required 82,5 x 270 = 22 275 g of hard coal, and 17,5 x 270 = 4 725 g of coal is saved producing this 100kWh.

However, the wind generated production has priority and forces the conventional stations to reactively ramp up and down. In the extreme case of the use of rapidly reacting open-cycle gasturbines only to achieve this, the efficiency falls from 55% to 30%.

Table 2 shows how the decreasing efficiency influences the saving of conventional fuel.

https://www.wind-watch.org/documents/hidden-fuel-costs-of-wind-generated-electricity/if we take into account all hidden gasoline, the're no savings at all == only losses ;)

I would argue that a wind farm likely won't slow down a fire, but could easily make it worse.

Once the flames lick at those lovely flammable composite blades, they'll loose strength, fly off and contribute to the fires fuel.

that's why there needs another design :)

 

[Z0dCHiY8]

It's quite rare for strong winds to damage a modern turbine - there are a number of features in the controller that prevent this.

good to hear, but-but..

Have you ever read that wind energy “is the cheapest energy source available?”

These claims are based on cost-estimates that assume the lifespan of wind turbines to be 30 years. However, according to the U.S. Energy Information Administration (EIA), the lifespan of wind turbines is about 20 to 25 years.

In Iowa, wind turbines are reaching the end of their lives even faster as MidAmerican Energy plans to repower turbines constructed in 2004, merely 14 years after they were installed.

To make matters worse, these cost-estimates attribute 30-year lifespans to every power plant – not just wind turbines – even though coal, nuclear, natural gas, and hydroelectric plants can generate electricity for more than 50 years.
https://www.americanexperiment.org/...ans-wind-turbines-result-higher-costs-energy/

 

[Baluncore]

How much are wind farms useful to manage wildfires?

Windfarms are no more use than a firebreak at stopping a wildfire. Wildfires have wide fire fronts, wider than any possible windfarm. Wildfires are not stopped by firebreaks as a wildfire will go over the top and around both ends. You can build hundreds of firebreaks for the cost of one windfarm.

While some forests should never be burnt, many forests are naturally shaped and regulated by fire. That natural process should be allowed to continue, or there will be an increased risk of catastrophic wildfire. It is clear that interference now makes things worse later.

Fire is also a human forest management tool that must be applied intelligently. If you can predict a wildfire in time to build a windfarm, (that will not stop it), you can instead build several firebreaks. Firebreaks make it possible to have a controlled burn at a safe time of the year, harvesting or burning adjacent blocks in different years. That sensible practice should prevent a catastrophic wildfire later.

Firebreaks require vehicle access and continued management. Firebreaks and controlled burning can really only be justified where a fire might spread into blocks of commercially valuable forest, or into a town.

To sum it all up. Wildfires are found in valleys with tall forests. Windfarms require level pads in rolling hills without trees. The two concepts are geographically incompatible.

 

[member 656954]

As it stands right now, wind energy is perfectly able to compete in many markets and locations with no government subsidy at all

Lazard's LCOE puts onshore wind as the consistently least expensive form of generation (with utility PV close behind), so @cjl is absolutely correct.

As for wind turbines somehow helping mitigate / fight forest fires, the only benefit they are likely to provide is reducing lightning strikes that start the fires in the first place. But if the turbine catches fire - which seems likely if they are in the path of a full-on forest fire - they release toxic fumes and and that's not a good outcome. Plus, the decommissioning gets even more complicated than normal.

 

[anorlunda]

This thread has become hopelessly confused. The OP question has been addressed. Thread closed.