Would Scrapping U.S. Subsidies for Renewable Energy Revive Coal?

If federal subsidies for renewables get phased out, will U.S. coal stage a comeback? In other words, will wind and solar get crowded out? 

That was the question posed by one industry veteran at the Platts Coal Marketing Days conference in Pittsburgh on Tuesday and here’s how a panel of experts responded:

Eric Murray, who manages coal supply for the Tennessee Valley Authority, pointed out that much of the pressure to prioritize renewables is actually coming from large corporations. These are major customers for the TVA, he said, and they often require that they get 100 percent of their power from renewables before agreeing to open facilities in the region. "That’s where I think you’ll have to see some sort of paradigm shift," Murray said.

Peter Balash, a Department of Energy economist, said that one thing hobbling the industry’s prospects is the nation’s aging fleet of coal-fired power plants. When the Energy Department simulates future power mixes, he said, it often projects most of the coal-fired plants will only be reliable for another 10 or 15 years. “That gives the industry and its stakeholders about that long to come up with coal plant designs that can work," he said.

Thomas Coleman, a director at the North American Electric Reliability Corporation, noted that one big headache for coal -- the Obama-era Clean Power Plan -- has been stopped. But the more immediate problem, he said, is that there are more than 20 states with renewable portfolio standards -- and those standards keep getting more stringent.

Karen Obenshain, a director at the Edison Electric Institute, pretty much agreed with her fellow panelists. “It’s state policies that are pushing the climate issue now since there’s a void at the federal level," she said. “Yes, our big industrial folks, they do want 100 percent renewables.”

Energy harvested from evaporation could power much of US

In the first evaluation of evaporation as a renewable energy source, researchers at Columbia University find that U.S. lakes and reservoirs could generate 325 gigawatts of power, nearly 70 percent of what the United States currently produces.

Though still limited to experiments in the lab, evaporation-harvested power could in principle be made on demand, day or night, overcoming the intermittency problems plaguing solar and wind energy. The researchers' calculations are outlined in the Sept. issue of Nature Communications.

"We have the technology to harness energy from wind, water and the sun, but evaporation is just as powerful," says the study's senior author Ozgur Sahin, a biophysicist at Columbia. "We can now put a number on its potential."

Evaporation is nature's way of cycling water between land and air. Sahin has previously shown how this basic process can be exploited to do work. One machine developed in his lab, the so-called Evaporation Engine, controls humidity with a shutter that opens and closes, prompting bacterial spores to expand and contract. The spores' contractions are transferred to a generator that makes electricity. The current study was designed to test how much power this process could theoretically produce.

One benefit of evaporation is that it can be generated only when needed. Solar and wind power, by contrast, require batteries to supply power when the sun isn't shining and wind isn't blowing. Batteries are also expensive and require toxic materials to manufacture.

"Evaporation comes with a natural battery," said study lead author, Ahmet-Hamdi Cavusoglu, a graduate student at Columbia. "You can make it your main source of power and draw on solar and wind when they're available." Evaporation technology can also save water. In the study, researchers estimate that half of the water that evaporates naturally from lakes and reservoirs into the atmosphere could be saved during the energy-harvesting process. In their model, that came to 25 trillion gallons a year, or about a fifth of the water Americans consume.

States with growing populations and sunnier weather can best capitalize on evaporation's capacity to generate power and reduce water waste, in part because evaporation packs more energy in warm and dry conditions, the researchers say. Drought-prone California, Nevada and Arizona could benefit most.

The researchers simplified their model in several ways to test evaporation's potential. They limited their calculations to the United States, where weather station data are readily accessible, and excluded prime locations such as farmland, rivers, the Great Lakes, and coastlines, to limit errors associated with modeling more complex interactions. They also made the assumption that technology to harvest energy from evaporation efficiently is fully developed.

Klaus Lackner, a physicist at Arizona State University who was not involved in the study, expressed support for the team's findings. Lackner is developing artificial trees that draw carbon dioxide from the air, in part, by harnessing the power of evaporation.

"Evaporation has the potential to do a lot of work," he said. "It's nice to see that drying and wetting cycles can also be used to collect mechanical energy."

The researchers are working to improve the energy efficiency of their spore-studded materials and hope to eventually test their concept on a lake, reservoir, or even a greenhouse, where the technology could be used to simultaneously make power and limit water loss.

Tesla Bringing Supercharger Stations To Boston And Chicago

On September 11th, Tesla announced the opening of Supercharger stations in downtown Boston and Chicago, representing the first step in the company’s effort to expand its Supercharger network into urban areas. The company currently operates 951 Supercharger stations worldwide, primarily along major highways to provide quick recharging on long trips. By bringing the network of charging stations into city centers, Tesla hopes to service growing demand among urban dwellers without immediate access to home or workplace charging.

Unlike the Destination Charging connectors at hotels and restaurants meant to replicate the longer home-charging process, Superchargers quickly deliver 72 kilowatts of power to each car for short-term boosts, resulting in charging times around 45-50 minutes. The new stations will be installed near supermarkets, shopping centers, and downtown districts, making it easy for drivers to charge their car while running errands. The Boston Supercharger station will be located at 800 Boylston Street and include 8 charging stalls.

Tesla announced plans to double its national charging network to 10,000 stations by the end of 2017. The company is bringing urban Superchargers to New York, Philadelphia, Washington, Los Angeles, and Austin by the end of this year. The expansion accompanies Tesla’s release of the Model 3 this summer, which boasts a lower starting price of $35,000 that is expected to bring more buyers to the brand.

A spike in Tesla sales would fall in line with the trend of increased demand for electric vehicles (EV) across the country. The year 2016 saw EV sales in the United States increase by 37% over 2015. Total EV sales topped out at roughly 160,000, with five different models (Tesla Model S, Tesla Model X, Chevrolet Volt, Nissan Leaf, and Ford Fusion Energi) selling at least 10,000 units. These sales, coupled with the expanding ease of access to charging station’s like Tesla’s, bode well for continued innovation and growth in the electric auto sector.

How Mexico’s Energy Reform Will Impact The U.S.

The liberalization of Mexico’s energy sector has the potential for big impacts on American operations, as the country is a major market for U.S. oil and gas.

Demand for oil, gas and refined products is growing quickly in Mexico. According to a recent webinar by Argus, the number of passenger vehicles in Mexico tripled from 2000 to 2014, and the company’s population growth rate is twice the average in OECD countries.

Lagging oil and gas production has hurt Mexico

Unfortunately, Mexico’s domestic production has lagged behind demand. The country has been forced to import increasing volumes from the U.S. Argus reports that gasoline imports from the U.S. in the first half of 2017 averaged 373 MBOPD, up 60 percent from 2015 levels. Imports of crude oil and natural gas have grown similarly.

According to EIA data, U.S. exports to Mexico of crude and refined products have been growing steadily in recent years. Oil heading into Mexico from the U.S. averaged around 560 MBPD from 2011 to 2014, but have grown to over 1 MMBPD in June this year. U.S. natural gas exports to Mexico have risen also, from just over 2 Bcf/d in the beginning of January 2015 to nearly 5.3 Bcf/d in June this year.

Mexico is attempting to adapt to this new environment by transforming its energy sector, aiming to improve both domestic production and its capacity for imports. Part of this program is the removal of restrictions on gasoline prices. For many years Mexico has imposed governmental price controls, setting a maximum allowable price for gasoline and diesel. However, this has begun to change.

The government began to phase out price controls in Baja California and Sonora at the end of March this year, and expanded these efforts to the northeastern states in mid-June. The program will expand to other regions gradually, and rest of the country is expected to be fully market-driven by the end of the year.

Additional programs include private construction of fuel storage, as the country currently only has a few days of demand in storage. Additional pipelines are also planned, both importing more hydrocarbons from the U.S. and improving domestic supply.

In addition, the government has been allowing private companies to work on projects for the first time in many years. The country’s first private offshore well in 80 years, the Zama-1, found great success. Operated by Talos Energy, Sierra Oil & Gas and Premier Oil (ticker: PMO), the well discovered 1.4 billion barrels of oil in place, far beyond the 100-500 million barrels expected.

The Mexican government is hoping to see similar success in onshore operations, as it is opening the Burgos basin, the Mexican portion of the Eagle Ford, to private investment. If the country is able to replicate the success of U.S. shale it may unlock significant natural gas reserves.

New political leadership may reverse changes

These programs may not be permanent, however. Mexico’s next presidential election will be held in July 2018, and could bring reversals for the country’s energy industry. The opposition frontrunner, Andrés Manuel Lopez Obrador, has promised to review several of the contracts and programs implemented by the current administration, meaning some may be overturned.

US shale oil growth to slow in October as Harvey takes a toll, Department of Energy reports

Surging production from U.S. shale fields is set to moderate next month, the Department of Energy's information arm forecast on Monday.

The U.S. Energy Information Administration projected crude oil output from several shale oil- and gas-producing regions will grow by 79,000 barrels a day in October. That marked the first time in seven months EIA's growth forecast came in below 100,000 barrels a day.

Total production for October is set to reach 6.08 million barrels a day, according to EIA.

Production from the Eagle Ford, a prolific oil-producing region in Texas, was revised down due in part to impacts from Hurricane Harvey. The storm forced some drillers to idle rigs last month as the devastating storm approached southeastern Texas.

U.S. shale producers use advanced drilling methods such as hydraulic fracturing to free oil and gas from rock formations. The so-called frackers have driven a drilling recovery in the United States this year.

The EIA revised down its outlook for U.S. shale oil production in September by 145,000 barrels a day to just over 6 million barrels a day. It previously estimated this month's production would be 6.15 million barrels a day.

Shale drillers in the Permian basin, the epicenter of the production rebound, are poised to grow output by 55,000 barrels a day, EIA said.

The Rocky Mountain-area Niobrara region and the Anadarko, located primarily in Oklahoma, are expected to post growth of 13,000 and 10,000 barrels a day, respectively. EIA expects North Dakota's Bakken shale output to rise by 8,000 barrels a day in October.

Meanwhile, the Eagle Ford is expected to see production slip by 9,000 barrels a day, due to the impact from Harvey and a separate downward revision to earlier data, EIA said.

Oil market watchers have been bracing for a slowdown in the U.S. oil patch because a weekly count of rigs has been falling recently. Baker Hughes reported on Friday that its U.S. rig count fell by seven rigs to the lowest level since June.

U.S. Energy Boom Can Bring China Into the Global Order

American policymakers and China-watchers worldwide often parse Chinese President Xi Jinping’s words, looking for clues about whether the leader intends to fully untangle the web of institutions and norms that have governed so much of the last 70 years or to merely reform it. A week ago, Xi spoke to a gathering of the so-called BRICS countries -- which include Brazil, Russia, India, China and South Africa -- and urged them to take an active role in shaping a more “just” world order. While some might read this exhortation as a call to radical action, others could see it as a mere rallying of the troops to modify the existing order to be better suited to the needs and viewpoints of emerging power centers, China foremost among them. In short, the jury is still out on how disruptive China intends to be. 

In his far-reaching book “World Order,” former Secretary of State Henry Kissinger described the period between 1948 and the turn of the century as “a brief moment in human history when one could speak of an incipient global world order composed of an amalgam of American idealism and traditional concepts of balance of power.” That moment was a product of enormous effort on the part of the U.S. and its Western allies to create and sustain the set of norms, institutions and frameworks undergirding an international order based on the values of participatory governance, respect for state sovereignty and liberal economic interaction.

Much of the world did well under this system. Democratic governance, by no means universal, is treasured by those who have it and desired by many who do not. While nonstate actors have risen in importance, states, by and large, have remained the main protagonists on the international scene. The liberal economic order has been even more successful, driving a period of unprecedented economic prosperity in which more than a billion people have been lifted out of extreme poverty since 1950. Wars have not ceased, but as pointed out by Harvard professor Steven Pinker, organized violent conflicts of all kinds have diminished in the past quarter-century.

This liberal international order, however, is under strain from both of the two tendencies that eventually challenge every world order in the view of scholars and statesmen. First is self-doubt; one could make the case that “those charged with maintaining the system” -- primarily the U.S. -- now question the values serving as the foundation of the order. The 2016 presidential election underscored how many Americans resent what they view as the excesses of globalization and, explicitly or implicitly, question the applicability of their political arrangements to other systems. Moreover, the positions articulated by President Donald Trump suggest that he is the first American president since World War II who sees the costs and responsibilities of underwriting the global order as greater than the benefits that accrue to the U.S..

The second challenge -- also clear in today’s world -- is when the international order struggles to accommodate significant changes in relations between major powers. China’s relationship to the current world order is particularly problematic. While perhaps no single country has benefited more from the economic structures in place over the last 70 years, China rejects the political constructs that often accompany them. Moreover, China had little say in the development of the rules of this order, given its preoccupation with its own civil war after World War II -- the time of “the creation,” in the words of Secretary of State Dean Acheson. Now, as a global power, Beijing is skeptical about both the legitimacy of these rules and their applicability to China and much of the world. At a minimum, China desires a greater say in how the system works, precipitating the need for the international order to adapt to new realities, or to crater under their pressure.

Scholars and policymakers feverishly debate whether it is possible for the U.S. and its allies to maintain the current system under this strain. Doing so is very much in the interest of the U.S. America has been the country most invested in this international order, and the spread of its advantages to others. But the order has also been the vehicle through which America has been able to influence and shape the world to its benefit. Its stewardship of the system -- with its international norms and behaviors -- is the ultimate soft power vehicle.

While the fate of the international order is unlikely to be resolved anytime soon, there is some good news for America and others who share its interest in maintaining it. The tremendous boom in energy production that has taken the U.S. -- and global energy markets -- by storm in the last several years actually helps America with the challenge of adapting the international order, while still preserving it in several ways.

First, the new energy abundance reinforces one of the mainstays of the international order: well-functioning markets. The new energy landscape is transforming -- and will continue to transform -- the nature of natural gas markets from being segregated, rigid, politicized and in many ways inefficient to being more integrated, fluid and better able to allocate resources in a predictable manner.

In addition, the energy boom has increased the confidence of critical players, most notably China, in the market. When energy was perceived as scarce, there was a trend of growing reliance on non-market measures to secure energy needs. Given these doubts about the sufficiency of global energy supplies, China therefore pursued a wide range of deals -- from equity investments to secure ownership of energy resources in other continents to bilateral arrangements in which oil was sold outside the market -- to ensure access to this most strategic of commodities. The new energy abundance has changed China’s approach. It is now more comfortable relying on the markets, which are the core of the liberal economic order, to meet its energy needs.

The new energy abundance also diminishes certain challenges to the international order that have persisted since the turn of the century. For instance, Beijing’s strategy of acquiring oil and gas resources in Africa and Latin America -- intentionally or not -- led China to support its own gallery of rogues; it cultivated relationships with governments acting decidedly outside the norms of the international order. In protecting regimes from Venezuela to Zimbabwe, China created space for governments that flouted international norms to exist and prosper. Now, in the face of the new energy abundance, China may see less need to pursue resources in this manner and at these costs, potentially removing or minimizing a persistent irritant to the international order. More obviously, an era of low prices will weaken regimes for which oil and gas revenue are a lifeblood; from Russia to Venezuela to Iran, many of these countries are the most frequent challengers to the international order.

Finally, the new energy abundance offers the U.S. and others more breathing room to conduct the reform of global energy governance structures that is required to meet new realities. In February 1974, with the world still reeling from the Arab oil embargo, Kissinger convened an energy conference in Washington, D.C. The goal was to establish some sort of institutional framework to galvanize cooperation among energy-consumingcountries. A new institution -- the International Energy Agency -- did emerge over the course of the year following the conference. The new Paris-based body was constructed under the auspices of the Organization for Economic Cooperation and Development, an organization established in 1961 to promote markets and economic development among politically like-minded countries. By its charter, all members of the OECD -- and therefore the IEA -- must be led by democratic governments with a commitment to market economies. For many years after the establishment of the IEA, this subset of countries coincided nicely with the large energy- and oil-consuming countries of the world.

In the past 15 years, however, non-OECD countries have developed growing and -- in the case of China -- massive interests in global energy governance. In 2012, China began to clamor for new global energy governance institutions. It was not simply pushing back on the dominant role of the IEA, but also lamenting the large number of non-inclusive, fragmented and uncoordinated international institutions addressing energy governance. Most recently, China has focused on the G-20 as a potential vehicle for establishing greater international cooperation on energy issues. Xi has reportedly said privately, and bluntly, that if China is to be part of the international energy order, it must have influence over how it is run.

The West and its institutions were slow to respond to China’s explicit calls for new international structures to manage global energy issues. However, a development in late 2014 lit a proverbial fire under those who had been nodding passively at China’s exhortation for new institutions or the reform of old ones. On Oct. 24, 2014, China and representatives from 21 other countries signed a charter for the establishment of the Asian Infrastructure Investment Bank. The Obama administration and others in the U.S. saw this move as a direct challenge by China to the Bretton Woods system that established the World Bank and the International Monetary Fund to help with the development of infrastructure and other projects. While some believe that China would have propelled the AIIB forward under any circumstances, others saw the move as a direct result of the sluggish pace at which the Bretton Woods institutions were willing to grant China greater influence in them, given that its economy has grown more than twenty-fold since their establishment in 1944.

U.S. and other officials were suddenly nervous that if Beijing’s persistent entreaties for reform of global energy governance were not addressed, China would launch its own parallel set of energy institutions, directly challenging yet another element of the existing international order. The combination of these anxieties, and recognition of the need to create more inclusive, coordinated structures, stoked a significant effort on the part of the IEA to bring China and other large energy consumers into the fold. Upon taking the helm of the IEA in September 2015, executive director Fatih Birol made Beijing the destination of his first official trip. There, he explained that strengthening ties between the IEA and emerging powers would be a key objective of his tenure. “China,” he told an audience at the Chinese Academy of Sciences, “is at the very top of this list.” In the months that followed, the IEA opened a joint energy center in Beijing. China and other Asian countries also activated an “association status,” granting them access to a wide variety of data, training, and discussions at the IEA.

Will such steps be sufficient to keep China -- and potentially others -- in the tent of existing international energy institutions and from creating competing institutions? That remains to be seen, but there is no question that agreeing to principles and terms of reference for new or existing structures will be less contentious in an environment of abundance than in one of scarcity and competition. Moreover, many of the steps that might be required of aspiring members or associates -- such as the obligation of creating a strategic oil stockpile equal to 90 days of the country’s consumption -- are more easily done when prices are relatively low, rather than sky-high.

There will be many factors that ultimately determine whether the next decades unfold under the familiar contours of the international order that has persisted since World War II -- or if this period is one of massive disruption and the growing dominance of new institutions and norms. Energy is but one factor in shaping the outcome. But it is a powerful one, and an often underappreciated one. And perhaps most importantly, it is a factor over which U.S. policymakers have some influence. They need to appreciate the broad strategic value of the energy boom originating within America’s borders and seek to leverage it to sustain other sources of U.S. power and influence.

Nearly 2.4 gigawatts of solar installed in the US during second quarter of 2017

The U.S. installed almost 2.4 gigawatts (GW) of solar photovoltaics in the second quarter of 2017, an increase of 8 percent year-on-year, according to a new report from GTM Research and the Solar Energy Industries Association (SEIA).

Breaking the figures down, a total of 2,387 megawatts (MW) were installed in the second quarter with total installed capacity in the U.S. hitting 47.1 GW, enough to power just over nine million homes.

Looking forward, the U.S. Solar Market Insight report forecast that this year would see the solar industry add 12.4 GW of new capacity, down from GTM Research's prior forecast of 12.6 GW.

"This report shows once again that solar is on the rise and will continue to add to its share of electricity generation," Abigail Ross Hopper, president and CEO of the SEIA, said in a statement on Monday.

"Last year, solar companies added jobs 17 times faster than the rest of the economy and increased our GDP by billions of dollars," she added. "We are going to continue to fight for policies that allow the industry to continue this phenomenal growth."

US stocks waver again as energy companies fall

Technology and energy companies skidded Friday while banks and insurers recovered some of their recent losses, leaving major U.S. indexes little changed on the day and moderately lower for the week.

Credit monitoring company Equifax plunged after it disclosed a data breach that affects 143 million Americans. Competitors TransUnion and Experian also fell, while data security companies like Symantec jumped as investors expected they will get more business.

Grocery stores and food companies slumped as Kroger said stiff competition forced it to cut prices. Target also said it is lowering prices. Technology companies including Apple, Facebook, Intel and chipmakers weakened.

Hurricane Irma continued to devastate islands in the Caribbean. The enormous storm killed at least 21 people, a total that is expected to rise as rescuers continue to search. It also left thousands of people homeless, and more than a million people in Florida and Georgia have been ordered to evacuate. Irma is expected to hit Florida over the weekend with winds surpassing 130 miles per hour.

Experts think the storms will slow down U.S. economic growth in the third quarter. While that's likely to be temporary, David Chalupnik, head of equities at Nuveen Asset Management, said the effect on the stock market could linger because it will be hard for investors to tell how much of any individual company's problems are caused by the weather.

"The next couple of months are going to be pretty cloudy," Chalupnik said. He said insurance companies, cruise lines, and oil refiners based in the Gulf Coast or Southeast could take losses and bad debt at credit card companies will increase, and since the storm will push the Federal Reserve to keep interest rates lower for a bit longer, that will hurt banks by keeping interest rates low on loans.

The Standard & Poor's 500 index lost 3.67 points, or 0.1 percent, to 2,461.43. The Dow Jones industrial average gained 13.01 points, or 0.1 percent, to 21,797.79. The Nasdaq composite dropped 37.68 points, or 0.6 percent, to 6,360.19. The Russell 2000 index of smaller-company stocks rose 0.76 points, or 0.1 percent, to 1,399.43. More stocks fell than rose on the New York Stock Exchange.

Equifax, which hit all-time highs last month, took its biggest one-day loss since 1999 after it said a cyber intrusion exposed Social Security numbers and other information from 143 million Americans between mid-May and late July. Equifax tumbled $19.49, or 13.7 percent, to $123.23. TransUnion fell $1.89, or 3.8 percent, to $47.50 and Experian fell 0.7 percent in London.

Security software company Symantec jumped $1.03, or 3.4 percent, to $31.63 and competitor FireEye rose 24 cents, or 1.5 percent, to $16.01.

Insurer Chubb rose $5.97, or 4.4 percent, to $140.85 and XL Group regained $2.13, or 5.8 percent, to $38.61. Still, investors expect the industry to take steep losses from Irma and Hurricane Harvey. Reinsurance companies, which sell policies that cover catastrophic losses like those caused by storms and floods, are down about 10 percent since early August. Property and casualty insurers have also stumbled.

Grocery store chain Kroger said intense competition with Target and Wal-Mart forced it to cut prices in the second quarter, which hurt its profits. Making matters worse, after the quarter ended Amazon.com completed its purchase of Whole Foods and immediately cut prices on many items. Kroger didn't change its annual forecast, but that projection doesn't account for the hurricanes, which may hurt its sales.

Kroger dropped $1.71, or 7.5 percent, to $21.06. Supervalu fell $1.43, or 6.8 percent, to $19.66. Target shed $1.15, or 2 percent, to $57.27 and Wal-Mart gave up $1.25, or 1.5 percent, to $78.88.

Energy companies fell as benchmark U.S. crude skidded $1.61, or 3.3 percent, to $47.48 a barrel in New York. Brent crude, used to price international oils, lost 71 cents, or 1.3 percent, to $53.78 a barrel in London.

Wholesale gasoline declined 1 cent to $1.65 a gallon. Heating oil fell 2 cents to $1.77 a gallon. Natural gas sank 9 cents, or 3.1 percent, to $2.89 per 1,000 cubic feet.

Bond prices dipped. The yield on the 10-year Treasury rose to 2.06 percent from 2.05 percent. Banks traded a bit higher. They had taken sharp losses on Thursday as bond yields and interest rates dropped.

Gold rose 90 cents to $1,351.20 an ounce. Silver added 1 cent to $18.12 an ounce. Copper retreated 10 cents, or 3.2 percent, to $3.04 a pound.

The dollar fell to 107.79 yen from 108.65 yen on Thursday. The euro strengthened to $1.2028 from $1.2003.

Natural disasters affected markets outside the U.S. as well. Mexico's Bolsa stock index fell 0.7 percent after a powerful earthquake hit near the southern coast. Authorities said least 58 people were killed.

The German DAX picked up 0.1 percent and the FTSE 100 index in Britain lost 0.3 percent. In France, the CAC 40 declined less than 0.1 percent. Japan's benchmark Nikkei 225 slid 0.6 percent after the country's economic growth rate was reduced. Hong Kong's Hang Seng added 0.5 percent and the Kospi in South Korea fell 0.1 percent.

 

There are over 341,000 wind turbines on the planet: Here's how much of a difference they're actually making

From the intense heat of the Californian desert to the green hills of Scotland, wind turbines are popping up all over the world.

Humans have been using wind energy for thousands of years. Today, its scope and scale is big and getting bigger. According to the Global Wind Energy Council (GWEC), at the end of 2016 more than 341,000 wind turbines were spinning and generating energy.

CNBC's Sustainable Energy takes a look at the nuts and bolts of wind power – how turbines work, wind energy's impact on the environment, and its role in the planet's energy mix over the coming years.

Offshore and onshore

With their considerable height and large blades, modern wind turbines are instantly recognizable.

How they produce energy can be broken down into several parts. Put simply, when the wind blows, a turbine's blades turn around a rotor. As the U.S. Department of Energy (DOE) explains, the rotor is connected to a main shaft, which in turn rotates a generator to produce electricity.

Wind energy can be produced both offshore and onshore. While the U.S. offshore wind industry is still in its infancy – America's first offshore wind farm only began commercial operations last December– it is well established in other parts of the world.

According to the GWEC, at the end of last year Europe was home to 3,589 offshore wind turbines. Furthermore, almost 88 percent of the world's offshore installations were based off the coast of 10 European countries.

The U.K. is a world leader in offshore wind, representing just shy of 36 percent of installed capacity, with Germany and China close behind.

Environmental impact

The GWEC says that in 2016 wind power helped the planet avoid more than 637 million tonnes of CO2 emissions.

The executive director of RenewableUK explained to CNBC how wind power had several plus points when it came to the environment. 

"Wind energy doesn't require a fuel source… once we're built we don't need to mine for anything and we don't need to burn fossil fuels which, as we know, are contributing to climate change," Emma Pinchbeck said. 

"It's sustainable as a form of energy production, but then it's also fairly sustainable as a form of infrastructure because of how we build it," she added. "The amount of energy that goes in to building a wind farm is 'paid off' after one year of generation from that wind farm."

There are some drawbacks, however. To give just one example, while the Royal Society for the Protection of Birds (RSPB) acknowledges that wind power has a "significant" part to play in the U.K.'s efforts against climate change, it adds that available evidence suggests that wind farms "can harm birds in three possible ways – disturbance, habitat loss and collision."

The future

Looking forward, the GWEC says that in the European Union, 520,000 people are expected to be working in the wind industry by 2020.

The DOE's Wind Vision Report says that wind could potentially support more than 600,000 jobs by the year 2050 and help avoid 12.3 gigatonnes of greenhouse gases.

Unsurprisingly, RenewableUK's Pinchbeck was incredibly positive about the future when it comes to renewables. "If I were an investor and I wanted to put my money on what the cheapest forms of energy were going to be, not just today but in ten years' time, it would be in renewables by a country mile," she said.

Energy companies lead modest rebound for US stock market

Energy companies led U.S. stocks to modest gains Wednesday as the market recouped some of its hefty losses from the day before.

Big retailers and health care companies also helped lift the market, which was coming off its worst day in almost three weeks. Utilities and phone companies were the biggest laggards. Some travel booking companies and airlines also fell.

Big retailers and health care companies also helped lift the market, which was coming off its worst day in almost three weeks. Utilities and phone companies were the biggest laggards. Some travel booking companies and airlines also fell.

"It's a little bit of a rebound from the sort of dramatic day yesterday after everybody got back from the long holiday weekend at the end of the summer and refocused on the market," said Lindsey Bell, investment strategist at CFRA Research. "We've seen that through the past year, any time we've had some sort of dip, it's a buying opportunity for investors."

The Standard & Poor's 500 index rose 7.69 points, or 0.3 percent, to 2,465.54. The Dow Jones industrial average added 54.33 points, or 0.3 percent, to 21,807.64. The Nasdaq composite gained 17.74 points, or 0.3 percent, to 6,393.31. The Russell 2000 index of smaller-company stocks picked up 2 points, or 0.2 percent, to 1,402.20.

The stock indexes are on pace to end the week lower, but are holding on to gains for the year. The S&P 500 and Dow are both up just over 10 percent. The Nasdaq is up 18.8 percent, while the Russell 2000 has gained 3.3 percent.

The market veered higher from the start of regular trading Wednesday and held its course through much of the day. News that President Donald Trump has agreed to a plan to fund the government and increase the nation's debt limit for three months helped lift the market.

"It reassured the market that Washington is on board with stabilizing its financial responsibilities," Bell said.

Tuesday's market jitters over the heated rhetoric between the U.S. and North Korea appeared to ease somewhat on Wednesday, even as investors monitored Hurricane Irma. The mammoth storm, which made its first landfall in the islands of the northeast Caribbean early Wednesday, seemed almost certain to hit the United States by early next week.

A day after spiking more than 20 percent, the VIX, a measure of how much volatility investors expect in stocks, fell nearly 5 percent on Wednesday. And bond yields, which fell sharply a day earlier, rebounded modestly. The yield on the 10-year Treasury note rose to 2.10 percent from 2.06 percent late Tuesday.

Gold, which climbed Tuesday to the highest level in more than a year, fell $5.50 to $1,339 an ounce Wednesday.

Rising oil prices helped boost energy stocks. Helmerich & Payne rose $2.58, or 5.9 percent, to $46.35. Marathon Oil added 44 cents, or 3.9 percent, to $11.73.

All told, benchmark U.S. crude gained 50 cents, or 1 percent, to settle at $49.16 a barrel on the New York Mercantile Exchange. Brent crude, used to price international oils, rose 82 cents, or 1.5 percent, to $54.20 a barrel in London.

Investors also bid up shares in several big retailers.

Gap shares surged 7.4 percent after the apparel retailer said it will shift its focus to its growing brands Old Navy and Athleta, and away from the Gap and Banana Republic. The company said that it will close about 200 Gap and Banana Republic stores in the next three years and open about 270 Old Navy and Athleta stores during the same period. The stock added $1.79 to $25.82. Macy's shares also got a boost, adding $1.16, or 5.5 percent, to $22.17.

Kohl's climbed 4.9 percent after the department store chain said it will open Amazon shops in 10 of its stores. Kohl's shares gained $1.98 to $42.37.

The fallout from Hurricane Harvey, which slammed the Gulf Coast of Texas last month, forced Newell Brands to cut its profit forecast, sending its shares lower Wednesday.

The consumer products maker noted that almost all of its resin suppliers with facilities in Texas and Louisiana shut down after that storm hit. Newell's shares gave up $1.69, or 3.5 percent, to $47.03.

United Continental slid 1.3 percent after the airline cut its third-quarter outlook, citing increased fuel costs due to Harvey. The stock fell 77 cents to $60.33.

Several travel booking companies also slid Wednesday.

Trivago tumbled 16.3 percent after the company cut its profit and revenue guidance. The stock lost $2.44 to $12.49. Rivals Expedia and TripAdvisor also fell. Expedia shed $3.22, or 2.2 percent, to $144.39, while TripAdvisor gave up 24 cents, or 0.5 percent, to $44.31.

The dollar rose to 109.37 yen from 108.66 yen Tuesday. The euro fell to $1.1913 from $1.1918.

In other energy trading, wholesale gasoline dipped 3 cents to $1.67 a gallon. Heating oil rose a penny to $1.76 a gallon. Natural added 3 cents to $3 per 1,000 cubic feet.

Among other metals, silver shed 3 cents to $17.91 an ounce, while copper gained 2 cents to $3.15 a pound.

Global stock markets were mixed. In Europe, Germany's DAX gained 0.7 percent, while France's CAC 40 rose 0.3 percent. The FTSE 100 index of leading British shares fell 0.3 percent.

Earlier in Asia, Japan's Nikkei 225 slipped 0.1 percent and South Korea's Kospi lost 0.3 percent. Hong Kong's Hang Seng index fell 0.5 percent.

Hackers gain entry into U.S., European energy sector, Symantec warns

Advanced hackers have targeted United States and European energy companies in a cyber espionage campaign that has in some cases successfully broken into the core systems that control the companies’ operations, according to researchers at the security firm Symantec.

Malicious email campaigns have been used to gain entry into organizations in the United States, Turkey and Switzerland, and likely other countries well, Symantec said in a report published on Wednesday.

The cyber attacks, which began in late 2015 but increased in frequency in April of this year, are probably the work of a foreign government and bear the hallmarks of a hacking group known as Dragonfly, Eric Chien, a cyber security researcher at Symantec, said in an interview.

The research adds to concerns that industrial firms, including power providers and other utilities, are susceptible to cyber attacks that could be leveraged for destructive purposes in the event of a major geopolitical conflict.

In June the U.S. government warned industrial firms about a hacking campaign targeting the nuclear and energy sectors, saying in an alert seen by Reuters that hackers sent phishing emails to harvest credentials in order to gain access to targeted networks.

Chien said he believed that alert likely referenced the same campaign Symantec has been tracking.

He said dozens of companies had been targeted and that a handful of them, including in the United States, had been compromised on the operational level. That level of access meant that motivation was “the only step left” preventing “sabotage of the power grid,” Chien said.

However, other researchers cast some doubt on the findings.

While concerning, the attacks were “far from the level of being able to turn off the lights, so there’s no alarmism needed,” said Robert M. Lee, founder of U.S. critical infrastructure security firm Dragos Inc, who read the report.

Lee called the connection to Dragonfly “loose.”

Dragonfly was previously active from around to 2011 to 2014, when it appeared to go dormant after several cyber firms published research exposing its attacks. The group, also known as Energetic Bear or Koala, was widely believed by security experts to be tied to the Russian government.

Symantec did not name Russia in its report but noted that the attackers used code strings that were in Russian. Other code used French, Symantec said, suggesting the attackers may be attempting to make it more difficult to identify them.

U.S. crude rises, gasoline falls as refineries restart

U.S. oil prices rose on Tuesday and gasoline fell as the gradual restart of refineries in the Gulf of Mexico that were shut by Hurricane Harvey raised demand for crude and eased fears of a fuel supply crunch.

Gasoline futures dropped 4 per cent from their last close, to $1.68 per gallon, down from $2.17 on Aug. 31 and back to levels last seen before Harvey hit the U.S. Gulf Coast and its large refining industry.

U.S. West Texas Intermediate crude futures rose more than 1 per cent to $47.84 per barrel by 1008 GMT, up 55 cents from their last settlement.

"Gasoline fell as refineries in Texas began to reopen," said William O'Loughlin, investment analyst at Rivkin Securities.

Texas was edging towards recovery from the devastation of Harvey as shipping channels, oil pipelines and refineries restarted some operations.

Eight U.S. oil refineries with 2.1 million barrels per day of refining capacity, or 11.4 per cent of the U.S. total, were shut as of Monday afternoon, the Department of Energy said.

Harvey hit the Texan coast late on Aug. 25 and at its peak knocked out almost a quarter of all U.S. refining capacity.

In international markets, Brent crude futures edged higher by 0.3 per cent to $52.49 a barrel amid signals the Organization of the Petroleum Exporting Countries could extend its output limits beyond the first quarter of 2018.

Russia and Saudi Arabia have discussed extending an oil output cut agreed among OPEC and non-OPEC producers but no specific decisions have been made yet, Russian Energy Minister Alexander Novak was quoted as saying on Tuesday.

Iranian Oil Minister Bijan Zangeneh said unofficial talks were under way to extend the cuts, adding that global crude inventories remained at high levels.