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 ...
  • 11.4k
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

What is the number 1 country by global installed wind capacity: the United States or China?

According to the REN21 Renewables Global Status Report 2014, China had 91.4 GW of installed wind capacity by the end of 2013, more than any other country in the world, of which 75.5 GW was in ...
  • 14.6k
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 ...
  • 11.4k
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
6 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 ...
  • 3,785
5 votes
Accepted

What is the scrap value of wind renewables?

Executive summary It's too early to tell what the resale value is, as contemporary turbine designs are not as old as the lifetime of a wind-turbine, so we have very little experience of the economic ...
  • 14.6k
5 votes

How can people afford to be self-sufficient and sustainable?

I'll give you an answer based on my previous readings and some years of researches/talks and practices about this subject. But I think that you can only reduce costs if you know and take into ...
  • 51
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. ...
  • 2,754
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-...
  • 14.6k
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 ...
  • 2,754
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 ...
  • 11.4k
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 ...
  • 2,754
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 ...
  • 3,494
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
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 (...
  • 14.2k
4 votes

How to log wind statistics data

Firstly, if it's rooftop wind you're asking about, then that's easy: it's not worth it - the air's too turbulent. But if it's a pole-mounted turbine that you're considering, then talk to a supplier ...
  • 14.6k
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 ...
  • 14.6k
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 ...
  • 2,754
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 ...
  • 14.6k
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
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 ...
  • 1,468
3 votes

What are the physical limits on wind turbine size?

With any given engineering field there is a learning curve. With wind turbines there is a big incentive to go big. The higher up you are, the more wind. In addition in many cases, it's easier to ...
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
2 votes

How can people afford to be self-sufficient and sustainable?

This is a huge question, with huge implications. In rural Colombia, where we are working, if a project is not productive, very few will implement it, and those that do will think you tricked them. ...
  • 769
2 votes

How quickly can the offshore-turbine supply chain expand?

Pretty open ended question. I would suggest that you look at historical examples. Most recently: Look at present suppliers, and see how long it took them to go from venture capital to production ...
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 ...
  • 11.4k
2 votes
Accepted

How to log wind statistics data

The first link in that search gives you a cup anemometer that puts out a standard 4-20mA signal that can be logged by a standard industrial data logger, meaning you can buy whatever duration you want. ...
  • 3,785

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