10
votes
Accepted
Is electricity used at night more likely to be renewable?
In Ireland, electricity is equally likely to be from renewable sources during the day as during the night
ENTSO-E, the European Network of Transmission System Operators for Electricity, provides a ...
- 11.9k
8
votes
Accepted
How to use a band brake cable with my home built wind turbine?
A scheme used on many BMX bikes is a "detangler" disk on the fork. It's actually two disks, surrounding the fork shaft, arranged with flanges such that pulling up on the upper disk lifts the lower ...
- 195
7
votes
How can I determine whether roof top wind turbines would be beneficial in my area?
One approach is to look for studies in this area and decide whether the idea is even plausible. Is it "a bit more expensive but I like the technology" or is it "much more expensive and ...
- 3,945
6
votes
Accepted
Wind farms using advanced technology (radar, AI, tracking) to shut down wind farm turbines when risks are highest for migratory and endangered birds?
The Netherlands
I am aware of 1 such wind farm in my country named 'Windpark Krammer'. This farm is located near 3 protected nature areas. According to their webpage that lists a few media articles (...
- 14.5k
6
votes
What is the wind wake effect and why is important for wind turbines?
The second slide of the presentation linked by you actually shows the issue with wake very clearly. You could also talk about turbulences instead of wake (my company actually does). Wake is simply the ...
- 587
6
votes
Accepted
Is wind power practically dead?
TL;DR: Wind is not dead, but a diverse set of economic, technical, and political factors have resulted in a leveling off of the rate of new construction.
The cost to build new wind declined for years ...
- 11.9k
6
votes
Are trees more productive than wind turbines?
Wind turbines do not turn the ground between them into desert. There is still farming and growth of various plants (even trees) possible. It should not be excluded in those comparisons and ...
- 929
5
votes
Are trees more productive than wind turbines?
A tree farm of that size in a temperate climate would only produce ~1.7GWh/y (net). You are overestimating the productive value of trees by a factor of ~15.
A 5MW wind turbine can produce a maximum ...
- 2,854
5
votes
Accepted
How to attach more sources of energy to your charge controller
If you have a single-string MPPT charge controller, then you should not even think of trying to combine your two generators (i.e. PV array and wind turbine) onto a single input and feeding that in.
...
- 2,854
5
votes
With current technology, how much CO2 is emitted when making renewable power plants?
Since raw materials scale according to size, every different panel/turbine will have a different answer. Different generators also have different maintenance costs, and lifespans. It's probably more ...
- 2,854
5
votes
Is wind power practically dead?
In 2018, global wind capacity increased from 515 GW to 564 GW - a 9.5% increase.
20 GW of that 49 GW increase was in China, 11 GW in Europe, 3 GW South America, 8 GW North America.
A 9.5% year-on-...
- 14.7k
5
votes
Why does wind just track the economy
It doesn't.
Assuming you're referring to wind capacity additions, it most closely tracks the political winds in the U.S., in the form of the Production Tax Credit (PTC), a federal incentive program ...
- 11.9k
5
votes
How much land needed to dispose of blades from wind turbines?
This wont answer your question, but will attempt to show, why the question is based on wrong assumptions.
That headline you're concerned about is missing a "yet". True, currently recycling ...
- 587
5
votes
Can data from wind and solar farms be used to improve climate modeling?
Wind turbines and solar panels are not precision measurement instruments. They are instruments to create electricity. So, the answer in general is no, but there may be some validity in the idea for at ...
- 5,144
4
votes
How many square kilometres of offshore wind farms would be required to replace the closing of a 4GW nuclear power station
Your figures are a bit out, but broadly in the right area. Using observed figures for the numbers you've estimated, I get 1,246 km²
90% capacity factor for nuclear is probably optimistic, but some ...
- 14.7k
3
votes
How many square kilometres of offshore wind farms would be required to replace the closing of a 4GW nuclear power station
Current high-end windturbines (WT) produce about 4.5 MW while being about 240 m high (top of rotor tip) and with a rotor diameter of 150 m.
When it comes to the distance between the WT, rule of thumb ...
- 587
3
votes
When does wind make more sense than solar for a home application?
Generally, solar is more reliable than wind. Ignoring arctic and antarctic latitudes most places get some sunlight during the day, even on overcast days. However, the same cannot be said for wind. ...
- 3,517
3
votes
Accepted
Is it possible to harvest energy from the storm?
Your idea is interesting but would fail in the real world for a number of reasons:
The energy embodied in even a moderate storm is staggering. No amount of "Stormbuoys" could make even a dent on a ...
- 2,854
3
votes
Is there a simple on-line tool for estimating wind turbine power output?
https://www.renewables.ninja/ will give you a crude estimate. But it's not very useful - it will often be very wrong for onshore wind.
In general, for any onshore wind, or any offshore wind close to ...
- 14.7k
3
votes
How are readings from the wind sensors mounted on wind turbines influenced by the blades' wakes?
I have some knowledge in this field, coming from several years' experience in drafting and defending patent applications that deal with wind turbines in one form or other.
If you're talking about a ...
- 169
3
votes
What does the P90 of a wind resource mean?
From the Wind Measurement International site:
P90 is all about quantifying the uncertainty of annual energy yield predictions. P90 is the energy WMI predicts that a wind turbine is 90% likely to ...
- 1,479
3
votes
Apply solar energy solutions at our apartment?
I'm not an expert on the topic but I have been doing similar research for the past several months as I'm planning to build an off-grid home and, obviously, renewable energy is critical for me. As ...
- 166
2
votes
What is a good database containing wind speed and direction?
There are lots of possible data sources. It will depend on the years you want, the geographic area you want, and the spatial and temporal resolution you want.
This is quite a large, well-established ...
- 14.7k
2
votes
Is there a recent study that shows how accurate wind turbine wake models are?
February 2018 comparison of two kinematic wake models and two actuator disc models
Simisiroglou, Polatidis, and Ivanell compared these four models to data from Lillgrund offshore wind farm in Sweden ...
- 11.9k
2
votes
Are trees more productive than wind turbines?
The question assumes a false dichotomy: Trees or turbines. The actual turbine footprint is small, leaving most of the land available for other purposes.
250,000 m2 is roughly 500m x 500m A 100m ...
- 7,227
1
vote
When does wind make more sense than solar for a home application?
I would certainly go first with solar PV : cheaper, no maintenance (at worst some rare cleaning), and it can be extended. It also mounts well on rooftop or be set on the ground (for more watts). ...
- 111
1
vote
What's the current price of power to gas fuel?
I've been curious about power to gas technology.
I've been curious about it too.
Do we know given the energy prices of solar or wind power, what the price/unit of the generated natural gas is ...
- 5,144
1
vote
How to use a band brake cable with my home built wind turbine?
Another option might be to leave the actuation cable dangling downward from a small hole in the housing. You'll probably have a regular old bike brake lever on a short length of wooden dowel as a ...
- 111
1
vote
Is wind power practically dead?
As far as Europe is concerned, more than half the new generating capacity installed in 2018 was wind turbine, the the amount installed in the first 6 months of 2019 is increased relative to 2018. In ...
- 1,021
1
vote
Is wind power practically dead?
No, wind power is not dead.
Look at the stock price history of Vestas Wind Systems, one of the major manufacturers of wind turbines.
In 2012, it was as low as 25 DKK.
Today, it's 587 DKK, over 20 ...
- 5,144
Only top scored, non community-wiki answers of a minimum length are eligible