US Army deploys its first floating solar array

New Brunswick EV Rebates deliver stackable provincial and federal incentives for electric vehicles, used EVs, and home chargers, supporting NB Power infrastructure, lower GHG emissions, and climate goals with fast chargers across the province.

Key Points

Stackable provincial and federal incentives up to $10,000 for EV purchases, plus support for home charging.

✅ $5,000 new EVs; $2,500 used; stackable with federal $5,000

✅ 50% home charger rebate up to $750 through NB Power

✅ Supports GHG cuts, charging network growth, climate targets

New Brunswickers looking for an electric vehicle (EV) can now claim up to $10,000 in rebates from the provincial and federal governments.

The three-year provincial program was announced Thursday and will give rebates of $5,000 on new EVs and $2,500 on used ones. It closely mirrors the federal program and is stackable, meaning new owners will be able to claim up to $5,000 from the feds as well.

Minister of Environment and Climate Change Gary Crossman said the move is hoped to kickstart the province’s push toward a target of having 20,000 EVs on the road by 2030.

“This incentive has to make a positive difference,” Crossman said.

“I truly believe people have been waiting for it, they’ve been asking about it, and this will make a difference from today moving forward to put new or used cars in their hands.”

The first year of the program will cost $1.95 million, which will come from the $36 million in the Climate Change Fund and will be run by NB Power, whose public charging network has been expanding across the province. The department says if the full amount is used this year it could represent a reduction of 850 tonnes of greenhouse gasses (GHGs) annually.

Both the Liberal and Green parties welcomed the move calling it long overdue, but Green MLA Kevin Arseneau said it’s not a “miracle solution.”

“Yes, we need to electrify cars, but this kind of initiative without proper funding of public transportation, urban planning for biking … without this kind of global approach this is just another swipe of a sword in water,” he said.

Liberal environment critic Francine Landry says she hopes this will make the difference for those considering the purchase of an EV and says the government should consider further methods of incentivization like waiving registration fees.

The province’s adoption of EVs has not been overly successful so far, reflecting broader Atlantic EV buying interest trends across the region. At the end of 2020, there were 646 EVs registered in the province, far short of the 2,500 target set out in the Climate Action Plan. That was up significantly from the 437 at the end of 2019, but still a long way from the goal.

New Brunswick has a fairly expansive network of charging stations across the province, claiming to be the first “fully-connected province” in the country, and had hoped that the available infrastructure, including plans for new fast-charging stations on the Trans-Canada, would push adoption of non-emitting vehicles.

“In 2017 we had 11 chargers in the province, so we’ve come a long way from an infrastructure standpoint which I think is critical to promoting or having an electric vehicle network, or a number of electric vehicles operating in the province, and neighbouring N.L.’s fast-charging network shows similar progress,” said Deputy Minister of Natural Resources Tom Macfarlane at a meeting of the standing committee on climate change and environmental stewardship in January of 2020.

There are now 172 level two chargers and 83 fast chargers, while Labrador’s EV infrastructure still lags in neighbouring N.L. today. Level two chargers take between six and eight hours to charge a vehicle, while the fast chargers take about half an hour to get to 80 per cent charge.

The newly announced program will also cover 50 per cent of costs for a home charging station up to $750, similar to B.C. charger rebates that support home infrastructure, to further address infrastructure needs.

The New Brunswick Lung Association is applauding the rebate plan.

President and CEO Melanie Langille said about 15,000 Canadians, including 40 people from New Brunswick, die prematurely each year from air pollution. She said vehicle emissions account for about 30 per cent of the province’s air pollution.

“Electric vehicles are critical to reducing our greenhouse gas emissions,” said Langille. “New Brunswick has one of the highest per capita GHG emissions in Canada. But, because our electricity source in New Brunswick is primarily from non-emitting sources and regional initiatives like Nova Scotia’s vehicle-to-grid pilot are advancing grid integration, switching to an EV is an effective way for New Brunswickers to lower their GHG emissions.”

Langille said the lung association has been part of an electric vehicles advisory group in the province since 2014 and its research has shown this type of program is needed.

“The major barrier that is standing in the way of New Brunswickers adopting electric vehicles is the upfront costs,” Langille said. “So today’s announcement, and that it can be stacked on top of the existing federal rebates, is a huge step forward for us.”

Related News

• Electricity Forum News

• EV Infrastructure News

U.S. Offshore Wind Power Strategy leverages UK offshore wind lessons, contract auctions, and supply chains to scale renewable energy, build wind farms, cut emissions, create jobs, and modernize the grid to meet 2030 climate goals.

Key Points

U.S. plan to scale offshore wind via UK-style contracts, turbines, and supply chains to meet 2030 clean energy goals

✅ Contract-for-difference price guarantees de-risk projects

✅ Scale turbines and ports to cut LCOE and boost capacity

✅ Build coastal grids, transmission, and workforce by 2030

As President Joe Biden’s administration puts its muscle behind wind power with plans to develop large-scale wind farms along the entire United States coastline, the administration can look at how the windiest nation in Europe is transforming its energy grid for an example of how to proceed.

In the search for renewable sources of energy, the United Kingdom has embraced wind power. In 2020, the country generated as much as 24 percent of its electricity from wind power across the grid — enough to supply 18.5 million homes, according to government statistics. 

With usually reliable winds, the U.K. currently has the highest number of offshore turbines installed in the world, with China at a close second.

Experts and industry leaders say it offers valuable lessons on creating a viable market for wind power at the ambitious scale the Biden administration hopes to meet in order to confront climate change and help transition the U.S. economy to renewable energy.

“The U.S. is going to benefit hugely from the early investment that European governments have put into offshore wind,” said Oliver Metcalfe, a wind power analyst at BloombergNEF in London, an independent research group.

Big American plans
On Oct. 13, the White House announced ambitious offshore wind plans to lease federal waters off of the East and West Coasts and Gulf of Mexico to develop commercial wind farms.

The move is part of Biden’s goal to have 30,000 megawatts of offshore wind power produced in the United States by 2030, with projects such as New York's record-setting approval highlighting the momentum. The White House says that would generate enough electricity to power more than 10 million homes and in the process create 77,000 jobs. 

But there is a chasm between where the U.S. is now and where it wants to be within the next decade when it comes to offshore wind power.

“We’re the first generation to understand the science and implications of climate change and we’re the last generation to be able to do something about it.”

The U.S. is not new to wind power; onshore wind in states such as Texas, Oklahoma and Iowa supplied 8.2 percent of the country’s total electricity generation in 2020, according to the U.S. Department of Energy. 

But despite its long coastlines, offshore wind has been a largely untapped resource in the U.S. With a population of about 332 million people, the U.S. currently has just two operational offshore wind farms — off Rhode Island and Virginia — with the capacity to produce 42 megawatts of electricity between them, far from the 1 gigawatt on-grid milestone many are watching. 

In contrast, the U.K., with a population of 67 million people, has 2,297 offshore wind turbines with the capacity to produce 10,415 megawatts of electricity.

Power station or a park?
Just outside of central Glasgow, the host city for the U.N. climate change conference known as COP26, the fruits of years of effort to move away from fossil fuels can be seen and heard

International financiers, including the World Bank are helping developing countries scale wind projects to meet climate goals.

Whitelee Windfarm, the U.K.’s largest onshore wind farm, spreads across 30 square miles on the Eaglesham Moor and includes more than 80 miles of trails for walking, cycling and horseback riding.

With its 539 megawatt capacity, it generates enough electricity for 350,000 homes — more than half the population of Glasgow. 

On a recent gusty fall day, Ian and Fiona Gardner, both 71, were walking their dogs among the wind farm’s 360-foot-tall turbines  

“This is a major contribution to Scotland, to become independent from oil by 2035,” Ian Gardner, an accountant, said. 

Thanks to the rapid technological advances in turbine technology, this wind farm that was completed in 2009, is now practically old school. The latest crop of onshore turbines typically generate double the current capacity of Whitelee’s turbines.

“It took us 20 years to build 2 gigawatts of power. And we’re going to double that in five  years,” said McQuade, an economist. “We can do that because machines are big, efficient, cheap and the supply chain is there.” 

The biggest operational offshore wind farm in the world right now, Hornsea Project One, is about 75 miles off England’s Yorkshire coast in the North Sea.

Owned and operated by Orsted, a former Danish oil and gas giant, in partnership with Global Infrastructure Partners, its 174 turbines have the capacity to generate 1.2 gigawatts — enough to power over 1 million homes and roughly equivalent to a nuclear power plant. 

Benj Sykes, Vice President of U.K. Offshore Wind at Orsted, called Hornsea One a “game changer” in a recent phone interview, citing it as an example of how the industry has scaled up its output to compete with traditional power plants.

But massive projects like Hornsea One took decades to get up and running, as well as government help. According to Malte Jansen, a research associate at the Centre of Environmental Policy at Imperial College London, the British government helped facilitate a “paradigm shift” in renewable energy in 2013.

The electricity market reform policy set up a framework to incentivize investment in offshore wind farms by creating an auction system that guarantees electricity prices to developers in 15-year contracts, alongside new contract awards that add 10 GW to the U.K. grid. 

This means there is no upside in terms of market price fluctuation, but there is no downside either. The policy essentially “de-risked the investment,” Jansen said.

The state contracts allowed the industry to innovate and learn how to develop even larger and more efficient turbines with blades that stretch as long as 267 feet, about three-quarters the size of a U.S. football field. 

While this approach helped companies and investors, it will also have an unintended beneficiary — the U.S., Metcalfe from BloombergNEF said. 

Developers are “taking the lessons they’ve learned building projects in Europe, the cost reductions that they’ve achieved building projects in Europe and are now bringing those to the U.S. market,” he said.

Related News

• Electricity Forum News

• Renewable Energy News

UK Renewable Energy Auction secures 10 GW for the grid at record-low costs, led by offshore wind, floating wind, solar, and onshore wind, with inflation-indexed CfDs delivering £37/MWh strike prices and enhanced energy security.

Key Points

Government CfDs add 10 GW of low-cost renewables to the UK grid via offshore wind, floating wind, and solar.

✅ 10 GW capacity: 7 GW offshore wind, 2.2 GW solar, 0.9 GW onshore wind

✅ Record-low £37/MWh offshore; floating wind at £87/MWh CfD strikes

✅ 15-year indexed contracts cut exposure to volatile gas prices

The United Kingdom will add 10 gigawatts (GW) of renewable energy capacity to its power grid at one-quarter the cost of fossil gas after concluding its biggest-ever renewable energy auction for new renewable supplies.

The “remarkable new UK renewable auction” will meet one-eighth of the country’s current electricity demand at record low prices of just £37 per megawatt-hour for offshore wind and £87 for floating offshore systems (a dynamic echoed as wind power gains in Canada across other markets), tweeted Carbon Brief Deputy Editor Simon Evans.

“The government is increasing its reliance on a local supply of renewables amid soaring UK power prices driven by a surge in the cost of natural gas following Russia’s invasion of Ukraine,” Bloomberg Green reports. Offshore wind energy “will add about seven gigawatts of clean power capacity to the nation’s fleet from 2026, bringing Britain closer to its target of installing 50 gigawatts by the end of the decade.”

The awards also include 2.2 gigawatts (that’s 2.2 billion watts) of solar and 900 megawatts of onshore wind, even as the UK faces a renewables backlog on some projects, Bloomberg says.

“Eye-watering gas prices are hitting consumers across Europe,” said UK Business and Energy Secretary Kwasi Kwarteng. “The more cheap, clean power we generate within our own borders, the better protected we will be from volatile gas prices that are pushing up bills.”

Citing government figures, Bloomberg says wind generation costs came in 5.8% lower than the previous auction in 2019, reflecting momentum in a sector set to become a trillion-dollar business this decade. Some of the winning bidders included Ørsted, Iberdrola’s Scottish Power unit, Vattenfall, and a consortium of AB Ignitis Grupe, EDP Renovaveis, and Engie.

“Offshore wind power costs have fallen dramatically in recent years as the UK supported the industry to scale up and industrialize production of larger, more efficient turbines,” the news story states. Now, “the decline in price developers are willing to accept comes even after the cost of wind turbines rose in recent months as prices increased for key metals like steel and supply chain disruptions created expensive delays.”

The 15-year, fixed-price contracts will be adjusted for inflation when the turbines are ready to start delivering electricity, offering lessons for the U.S. wind sector on contract design.

Related News

• Electricity Forum News

• Renewable Energy News

Inflation Reduction Act Energy Credits help households electrify with tax credits and rebates for heat pumps, EVs, rooftop solar, battery storage, and efficiency upgrades, cutting utility bills, reducing carbon emissions, and accelerating home electrification nationwide.

Key Points

Federal incentives offering tax credits and rebates for heat pumps, EVs, solar, and efficiency to cut emissions.

✅ 30% rooftop solar and storage credit; $2,000 annual cap for heat pumps

✅ Up to $7,500 EV tax credit; price, income, and assembly rules apply

✅ Low-income rebates and discounts available via states starting mid-2023

Earlier this year, Congress passed the biggest climate bill in history — cloaked under the name the “Inflation Reduction Act,” a historic climate deal by any measure.

Starting in the new year, the bill will offer households thousands of dollars to transition over from fossil-fuel burning heaters, stoves and cars to cleaner versions as renewable electricity accelerates. On Jan. 1, middle-income households will be able to access over a half-dozen tax credits for electric stoves, cars, rooftop solar and more. And starting sometime in mid-2023, lower-income households will be able to get upfront discounts on some of those same appliances — without having to wait to file their taxes to get the cash back. This handy online tool shows what you might be eligible for, depending on your Zip code and income.

But which credits should Americans focus on — and which are best for the climate? Here’s a guide to the top climate-friendly benefits of the Inflation Reduction Act, and how to access them.

Heat pumps — the best choice for decarbonizing at home

Tax credit available on Jan. 1: 30 percent of the cost, up to $2,000

Income limit: None

Ah, heat pumps — one of the most popular technologies of the transition to clean energy and to net-zero electricity systems. “Heat pump” is a bit of a misnomer for these machines, which are more like super-efficient combo air conditioning and heating systems. These appliances run on electricity and move heat, instead of creating it, and so can be three to five times more efficient than traditional gas or electrical resistance heaters.

“For a lot of people, a heat pump is going to be their biggest personal impact,” said Sage Briscoe, the federal senior policy manager at Rewiring America, a clean-energy think tank. (Heat pumps have become so iconic that Rewiring America even has a heat pump mascot.)

Heat pumps can have enormous cost and carbon savings. According to one analysis using data from the National Renewable Energy Laboratory, switching to a heat pump can save homeowners anywhere from $100 to $1,200 per year on heating bills and prevent anywhere from 1 to 8 metric tons of carbon dioxide emissions per year. For comparison, going vegan for an entire year saves about 1 metric ton of CO2 emissions.

But many consumers encounter obstacles when switching over to heat pumps. In some areas, it can be difficult to find a contractor trained and willing to install them; some homeowners report that contractors share misinformation about heat pumps, including that they don’t work in cold climates. (Modern heat pumps do work in cold climates, and can heat a home even when outdoor temperatures are down to minus-31 degrees Fahrenheit.) Briscoe recommends that homeowners look for skilled contractors who know about heat pumps and do advance research to figure out which models might work best for their home.

Electric vehicles — top choice for cutting car emissions

Tax credit available on Jan. 1: Up to $7,500 depending on the make and model of the car

Income limit: <$150,000 for single filers; <$300,000 for joint filers

If you are like the millions of Americans who don’t live in a community with ample public transit, the best way to decarbonize your transport, as New Zealand's electricity transition shows, is switching to an electric car. But electric cars can be prohibitively expensive for many Americans.

Starting Jan. 1, a new EV tax credit will offer consumers up to $7,500 off the purchase of an electric vehicle. For the first few months, Americans will get somewhere between $3,751 and $7,500 off their purchase of an EV, depending on the size of the battery in the car.

There are limitations, per the new law. The vehicles will also have to be assembled in North America, where Canada's electricity progress is notable, and cars that cost more than $55,000 aren’t eligible, nor are vans or trucks that cost more than $80,000. This week, the Internal Revenue Service provided a list of vehicles that are expected to meet the criteria starting Jan. 1.

Beginning about March, however, that $7,500 credit will be split into two parts: Consumers can get a $3,750 credit if the vehicle has a battery containing at least 40 percent critical minerals from the United States (or a country that the United States has a free-trade agreement with) and another $3,750 credit if at least 50 percent of the battery’s components were assembled and manufactured in North America. Those rules haven’t been finalized yet, so the tax credit starting on Jan. 1 is a stopgap measure until the White House has ironed out the final version.

Joe Britton, the executive director of the EV industry group Zeta, said that means there will likely be a wider group of vehicles eligible for the full tax credit in January and February than there will be later in 2023. Because of this, he recommended that potential EV owners act fast in 2023.

“I would be buying a car in the first quarter,” he said.

Rooftop solar — the best choice for generating clean energy

Tax credit available now: 30 percent of the cost of installation, no cap

Income limit: None

For those who want to generate their own clean energy, there is always rooftop solar panels. This tax credit has actually been available since the Inflation Reduction Act was signed into law in August 2022. It offers a tax credit equal to 30 percent of the cost of installing rooftop solar, with no cap. According to Rewiring America, the average 6 kilowatt solar installation costs about $19,000, making the average solar tax credit about $5,700. (The Inflation Reduction Act also includes a 30 percent tax credit for homeowners that need to upgrade their electricity panel for rooftop solar, and a 30 percent tax credit for installing battery storage to support the shift toward carbon-free electricity solutions.)

Solar panels can save homeowners tens of thousands of dollars in utility bills as extreme heat boosts electricity bills and, when combined with battery storage, can also provide a power backup in the case of a blackout or other disaster. For someone trying to move their entire home away from fossil fuels, solar panels become even more enticing: Switch everything over to electricity, and then make the electricity super cheap with the help from the sun.

For people who don’t own their own homes, there are other options as well. Renters can subscribe to a community solar project to lower their electricity bills and get indirect benefits from the tax credits.

Tips, tricks and words of caution
There are many other credits also coming out in 2023: for EV chargers (up to $1,000), a boon for expanding carbon-free electricity across the grid, heat pump water heaters (up to $2,000), and even cash for sealing up the doors and windows of your home (up to $1,200).

The most important thing to know, Briscoe said, is whether you qualify for the upfront discounts for low- and moderate-income Americans — which won’t be available until later in 2023 — or the tax credits, which will be available Jan. 1. (Try this tool.) If going the tax credit route, it’s better to spread the upgrades out across multiple years, since there is an annual limit on how many of the credits you can claim in a given year. And, she warned, it is not always going to be easy: It can be hard to find the right installers and the right information for how to make use of all the available government resources.

Related News

• Electricity Forum News

• Climate Change News

Electric Car Motors convert electricity to torque via rotor-stator magnetic fields, using AC/DC inverters, permanent magnets or induction designs; they power EV powertrains efficiently and enable regenerative braking for energy recovery and control.

Key Points

Electric car motors turn electrical energy into wheel torque using rotor-stator fields, inverters, and AC or DC control.

✅ AC induction, PMSM, BLDC, and reluctance architectures explained

✅ Inverters manage AC/DC, voltage, and motor speed via frequency

✅ Regenerative braking recovers energy and reduces wear

When was the last time you stopped to think about how electric cars actually work, especially if you're wondering whether to buy an electric car today? We superfans of the car biz have mostly developed a reasonable understanding of how combustion powertrains work. Most of us can visualize fuel and air entering a combustion chamber, exploding, pushing a piston down, and rotating a crankshaft that ultimately turns the wheels. We generally understand the differences between inline, flat, vee-shaped, and maybe even Wankel rotary combustion engines.

Mechanical engineering concepts such as these are comparatively easy to comprehend. But it's probably a fair bet to wager that only a minority of folks reading this can explain on a bar napkin exactly how invisible electrons turn a car's wheels or how a permanent-magnet motor differs from an AC induction one. Electrical engineering can seem like black magic and witchcraft to car nuts, so it's time to demystify this bold new world of electromobility, with the age of electric cars arriving ahead of schedule.

How Electric Cars Work: Motors
It has to do with magnetism and the natural interplay between electric fields and magnetic fields. When an electrical circuit closes allowing electrons to move along a wire, those moving electrons generate an electromagnetic field complete with a north and a south pole. When this happens in the presence of another magnetic field—either from a different batch of speeding electrons or from Wile E. Coyote's giant ACME horseshoe magnet, those opposite poles attract, and like poles repel each other.

Electric motors work by mounting one set of magnets or electromagnets to a shaft and another set to a housing surrounding that shaft. By periodically reversing the polarity (swapping the north and south poles) of one set of electromagnets, the motor leverages these attracting and repelling forces to rotate the shaft, thereby converting electricity into torque and ultimately turning the wheels, in a sector where the electric motor market is growing rapidly worldwide. Conversely—as in the case of regenerative braking—these magnetic/electromagnetic forces can transform motion back into electricity.

How Electric Cars Work: AC Or DC?
The electricity supplied to your home arrives as alternating current (AC), and bidirectional charging means EVs can power homes for days as needed, so-called because the north/south or plus/minus polarity of the power changes (alternates) 60 times per second. (That is, in the United States and other countries operating at 110 volts; countries with a 220-volt standard typically use 50-Hz AC.) Direct current (DC) is what goes into and comes out of the + and - poles of every battery. As noted above, motors require alternating current to spin. Without it, the electromagnetic force would simply lock their north and south poles together. It's the cycle of continually switching north and south that keeps a motor spinning.

Today's electric cars are designed to manage both AC and DC energy on board. The battery stores and dispenses DC current, but again, the motor needs AC. When recharging the battery, and with increasing grid coordination enabling flexibility, the energy comes into the onboard charger as AC current during Level 1 and Level 2 charging and as DC high-voltage current on Level 3 "fast chargers." Sophisticated power electronics (which we will not attempt to explain here) handle the multiple onboard AC/DC conversions while stepping the voltage up and down from 100 to 800 volts of charging power to battery/motor system voltages of 350-800 volts to the many vehicle lighting, infotainment, and chassis functions that require 12-48-volt DC electricity.

How Electric Cars Work: What Types Of Motors?
DC Motor (Brushed): Yes, we just said AC makes the motor go around, and these old-style motors that powered early EVs of the 1900s are no different. DC current from the battery is delivered to the rotor windings via spring-loaded "brushes" of carbon or lead that energize spinning contacts connected to wire windings. Every few degrees of rotation, the brushes energize a new set of contacts; this continually reverses the polarity of the electromagnet on the rotor as the motor shaft turns. (This ring of contacts is known as the commutator).

The housing surrounding the rotor's electromagnetic windings typically features permanent magnets. (A "series DC" or so-called "universal motor" may use an electromagnetic stator.) Advantages are low initial cost, high reliability, and ease of motor control. Varying the voltage regulates the motor's speed, while changing the current controls its torque. Disadvantages include a lower lifespan and the cost of maintaining the brushes and contacts. This motor is seldom used in transportation today, save for some Indian railway locomotives.

Brushless DC Motor (BLDC): The brushes and their maintenance are eliminated by moving the permanent magnets to the rotor, placing the electromagnets on the stator (housing), and using an external motor controller to alternately switch the various field windings from plus to minus, thereby generating the rotating magnetic field.

Advantages are a long lifespan, low maintenance, and high efficiency. Disadvantages are higher initial cost and more complicated motor speed controllers that typically require three Hall-effect sensors to get the stator-winding current phased correctly. That switching of the stator windings can result in "torque ripple"—periodic increases and decreases in the delivered torque. This type of motor is popular for smaller vehicles like electric bikes and scooters, and it's used in some ancillary automotive applications like electric power steering assist.

Permanent-Magnet Synchronous Motor (PMSM): Physically, the BLDC and PMSM motors look nearly identical. Both feature permanent magnets on the rotor and field windings in the stator. The key difference is that instead of using DC current and switching various windings on and off periodically to spin the permanent magnets, the PMSM functions on continuous sinusoidal AC current. This means it suffers no torque ripple and needs only one Hall-effect sensor to determine rotor speed and position, so it's more efficient and quieter.

The word "synchronous" indicates the rotor spins at the same speed as the magnetic field in the windings. Its big advantages are its power density and strong starting torque. A main disadvantage of any motor with spinning permanent magnets is that it creates "back electromotive force" (EMF) when not powered at speed, which causes drag and heat that can demagnetize the motor. This motor type also sees some duty in power steering and brake systems, but it has become the motor design of choice in most of today's battery electric and hybrid vehicles.

Note that most permanent-magnet motors of all kinds orient their north-south axis perpendicular to the output shaft. This generates "radial (magnetic) flux." A new class of "axial flux" motors orients the magnets' N-S axes parallel to the shaft, usually on pairs of discs sandwiching stationary stator windings in between. The compact, high-torque axial flux orientation of these so-called "pancake motors" can be applied to either BLDC or PMSM type motors.

AC Induction: For this motor, we toss out the permanent magnets on the rotor (and their increasingly scarce rare earth materials) and keep the AC current flowing through stator windings as in the PMSM motor above.

Standing in for the magnets is a concept Nikola Tesla patented in 1888: As AC current flows through various windings in the stator, the windings generate a rotating field of magnetic flux. As these magnetic lines pass through perpendicular windings on a rotor, they induce an electric current. This then generates another magnetic force that induces the rotor to turn. Because this force is only induced when the magnetic field lines cross the rotor windings, the rotor will experience no torque or force if it rotates at the same (synchronous) speed as the rotating magnetic field.

This means AC induction motors are inherently asynchronous. Rotor speed is controlled by varying the alternating current's frequency. At light loads, the inverter controlling the motor can reduce voltage to reduce magnetic losses and improve efficiency. Depowering an induction motor during cruising when it isn't needed eliminates the drag created by a permanent-magnet motor, while dual-motor EVs using PMSM motors on both axles must always power all motors. Peak efficiency may be slightly greater for BLDC or PMSM designs, but AC induction motors often achieve higher average efficiency. Another small trade-off is slightly lower starting torque than PMSM. The GM EV1 of the mid-1990s and most Teslas have employed AC Induction motors, despite skepticism about an EV revolution in some quarters.

Reluctance Motor: Think of "reluctance" as magnetic resistance: the degree to which an object opposes magnetic flux. A reluctance motor's stator features multiple electromagnet poles—concentrated windings that form highly localized north or south poles. In a switched reluctance motor (SRM), the rotor is made of soft magnetic material such as laminated silicon steel, with multiple projections designed to interact with the stator's poles. The various electromagnet poles are turned on and off in much the same way the field windings in a BLDC motor are. Using an unequal number of stator and rotor poles ensures some poles are aligned (for minimum reluctance), while others are directly in between opposite poles (maximum reluctance). Switching the stator polarity then pulls the rotor around at an asynchronous speed.

A synchronous reluctance motor (SynRM) doesn't rely on this imbalance in the rotor and stator poles. Rather, SynRM motors feature a more distributed winding fed with a sinusoidal AC current as in a PMSM design, with speed regulated by a variable-frequency drive, and an elaborately shaped rotor with voids shaped like magnetic flux lines to optimize reluctance.

The latest trend is to place small permanent magnets (often simpler ferrite ones) in some of these voids to take advantage of both magnetic and reluctance torque while minimizing cost and the back EMF (or counter-electromotive force) high-speed inefficiencies that permanent-magnet motors suffer.

Advantages include lower cost, simplicity, and high efficiency. Disadvantages can include noise and torque ripple (especially for switched reluctance motors). Toyota introduced an internal permanent-magnet synchronous reluctance motor (IPM SynRM) on the Prius, and Tesla now pairs one such motor with an AC induction motor on its Dual Motor models. Tesla also uses IPM SynRM as the single motor for its rear-drive models.

Electric motors may never sing like a small-block or a flat-plane crank Ferrari. But maybe, a decade or so from now, we'll regard the Tesla Plaid powertrain as fondly as we do those engines, even as industry leaders note that mainstream adoption faces hurdles, and every car lover will be able to describe in intimate detail what kind of motors it uses.
 

Related News

• Electricity Forum News

• EV Infrastructure News

Sicily Green Hydrogen accelerates decarbonization via renewable energy, wind farm electrolysis, hydrogen storage, and distribution from Enel Green Power and Sapio at the NextHy industrial lab in Carlentini and Sortino Sicily hub.

Key Points

Sicily Green Hydrogen is an Enel-Sapio plan to produce hydrogen via wind electrolysis for industrial decarbonization.

✅ 4 MW electrolyzer powered by Carlentini wind farm

✅ Estimated 200+ tons annual green H2 production capacity

✅ Market distribution managed by Sapio across Sicily

This green hydrogen will be produced at the Sicilian industrial plant, an innovative hub that puts technology at the service of the energy transition, echoing hydrogen innovation funds that support similar goals worldwide

Activating a supply of green hydrogen produced using renewable energy from the Carlentini wind farm in eastern Sicily is the focus of the agreement signed by Enel Green Power and Sapio. The agreement provides for the sale to Sapio of the green hydrogen that will be produced, stored in clean energy storage facilities and made available from 2023 at the Carlentini and Sortino production sites, home to Enel Green Powers futuristic NextHy innitiative. Sapio will be responsible for developing the market and handling the distribution of renewable hydrogen to the end customer.

In contexts where electrification is not easily achievable, green hydrogen is the key solution for decarbonization as it is emission-free and offers a potential future for power companies alongside promising development prospects, commented Salvatore Bernabei, CEO of Enel Green Power. For this reason we are excited about the agreement with Sapio. It is an agreement that looks to the future by combining technological innovation and sustainable production.

Sapio is strongly committed to contributing to the EUs achievement of the UN SDGs, commented Alberto Dossi, President of the Sapio Group, and with this project we are taking a firm step towards sustainable development in our country. The agreement with EGP also gives us the opportunity to integrate green hydrogen into our business model, as jurisdictions propose hydrogen-friendly electricity rates to grow the hydrogen economy, which is based on our strong technological expertise in hydrogen and its distribution over 100 years in business. In this way we will also be able to give further support to the industrial activities we are already carrying out in Sicily.

The estimated 200+ tons of production capacity of the Sicilian hub is the subject of the annual supply foreseen in the agreement. Once fully operational, the green hydrogen will be produced mainly by a 4 MW electrolyzer, which is powered exclusively by the renewable energy of the existing wind farm, and to a lesser extent by the state-of-the-art electrolysis systems tested in the platform. Launched by Enel Green Power in September 2021, NextHys Hydrogen Industrial Lab is a unique example of an industrial laboratory in which production activity is constantly accompanied by technological research. In addition to the sectors reserved for full-scale production, there are also areas dedicated to testing new electrolyzers, components such as valves and compressors, and innovative storage solutions based on liquid and solid means of storage: in line with Enels open-ended approach, this activity will be open to the collaboration of more than 25 entities including partners, stakeholders and innovative startups. The entire complex is currently undergoing an environmental impact assessment at the Sicily Regions Department of Land and Environment.

It is an ambitious project with a sustainable energy source at its heart that will be developed at every link in the chain: thanks to the agreement with Sapio, in fact, at NextHy green hydrogen will now not only be produced, stored and moved on an industrial scale, but also purchased and used by companies that have understood that green hydrogen is the solution for decarbonizing their production processes. In this context, this experimental approach that is open to external contributions will allow the Enel Green Power laboratory team to test the project on an industrial scale, so as to create the best conditions for a commercial environment that can make the most of all present and future technologies for the generation, storage and transport of green hydrogen, including green hydrogen microgrids that demonstrate scalable integration. It is an initiative consistent with Enels Open Innovability spirit: meeting the challenges of the energy transition by focusing on innovation, ideas and their transformation into reality.

Related News

• Electricity Forum News

• EV Infrastructure News