Electric energy production using non-renewable processes produces an immense amount of carbon, and as a civilization we can’t afford to put more carbon in the atmosphere. Researchers from the University of Colorado Boulder set out to figure out how much pollution do power plants actually produce and what can we do about the worst ones. They found that 73% of pollution came from just 5% of power plants, unsurprisingly those plants used coal. So let’s shut them down!
According to the authors of the research, the emission intensity of the ten worst plants exceeded those of other fossil fuel power plants in their home countries in 2018 at a rate 28.2 percent to 75.6 percent higher than their counterparts. This suggests that the plants are very inefficient in burning coal, the research showed.
â€œWhy these relatively inefficient plants are used so heavily is a topic ripe for future investigation,â€ the authors wrote.
Graphene has long been heralded as an amazing new material that can change entire industries and revolutionize the economy. Notably this has yet to happen. Yet.
At the University of Arkansas a team of physicists found a way to use graphene to generate limitless power based on the movement of atoms. Since a graphene layer is only one atom thick the thermal changes from the Earth can move the atoms ever so slightly, so as long as the Earth generates heat this graphene sheet made the team can generate minuscule amounts of energy.
We’re finally getting to see some cool theories about graphene get turned into real applications.
The team used a relatively new field of physics to prove the diodes increased the circuitâ€™s power. â€œIn proving this power enhancement, we drew from the emergent field of stochastic thermodynamics and extended the nearly century-old, celebrated theory of Nyquist,â€ said coauthor Pradeep Kumar, associate professor of physics and coauthor.
According to Kumar, the graphene and circuit share a symbiotic relationship. Though the thermal environment is performing work on the load resistor, the graphene and circuit are at the same temperature and heat does not flow between the two.
In order to avert climate catastrophe we’re going to have to make boring changes to our built infrastructure. Politicians find it hard to argue for these sorts of enhancements because voters don’t get to see a ribbon cutting ceremony; however changes to infrastructure can make a massive difference. In the USA alone enhancing electrical transmission over power lines can reduce carbon emissions comparable to the entire chemical industry. And power lines are boring. As we find ways to use power lines (and other existing infrastructure) we need to encourage and reward politicians who want to improve them to save our planet.
Technical losses are the simplest to address through the deployment of more advanced technologies and by upgrading existing infrastructure, both for long-distance transmission of power and distribution at the local level. Improvements in transmission can be made, for example, by replacing inefficient wires, using superconductors that reduce resistance in wires, and thus lost energy, and controlling power flow and high-voltage direct current.
Similarly, improvements in distribution can be achieved by better managing the load and distribution of power, as well as how distribution lines are configured. Innovation, such as adopting digital technologies for routing power flows, can also play a role.
Solutions for nontechnical losses are more challenging and may only partially cut associated emissions. The causes of high losses are diverse and can originate in, for example, extreme events, such as the hurricanes that struck Haiti and Puerto Rico in recent years, or war, or a combination of weak governance, corruption and poverty, as seen in India. For either type of losses, countries with large shares of fossil fuel generation and the most inefficient grid infrastructure can cut the greatest emissions and reap the largest environmental benefits from reducing transmission and distribution losses.
Everyone already knows that burning coal for energy is absolutely horrible for the planet and were still learning just how bad coal power plants really are. The positive news is that once the plants are closed positive changes are quick to be found. A recent study found that shutting down coal power plants can be connected to the saving of 26,610 lives in the USA alone. There are other benefits too like cleaner air for plants, which in turns increases crop yields. This is yet more evidence that we need to do everything in our power to shutdown the use of coal.
An estimated 26,610 lives were saved in the US by the shift away from coal between 2005 and 2016, according to the University of California study published in Nature Sustainability.
“When you turn coal units off you see deaths go down. Itâ€™s something we can see in a tangible way,â€ said Jennifer Burney, a University of California academic who authored the study. â€œThere is a cost to coal beyond the economics. We have to think carefully about where plants are sited, as well as how to reduce their pollutants.â€
Renewable energy just kept getting cheaper and cheaper despite ongoing subsides for the oil and gas industries. This is really good to see as people who only care about short term economic energy decisions will have to start to advocate for renewable energy. The decrease in cost for renewable wind power can be attributed to bigger blades and better energy grid management. This means that not only is wind power cheaper, the better grid management can lead to other renewable sources getting cheaper too.
In the US, the prices for wind power had risen up until 2009, when power purchase agreements for wind-generated electricity peaked at about $70 per MegaWatt-hour. Since then, there’s been a very steady decline, and 2018 saw the national average fall below $20/MW-hr for the first time. Again, there’s regional variation with the Great Plains seeing the lowest prices, in some cases reaching the mid-teens.
That puts wind in an incredibly competitive position. The report uses an estimate of future natural gas prices that show an extremely gradual rise of about $10/MW-hr out to 2050. But natural gasâ€”on its own, without considering the cost of a plant to burn it for electricityâ€”is already over $20/MW-hr. That means wind sited in the center of the US is already cheaper than fueling a natural gas plant, and wind sited elsewhere is roughly equal.