Most Afghans still without power

By Associated Press


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The goal is to transform Afghanistan into a modern nation, fueled by a U.S.-led effort pouring $60 billion into bringing electricity, clean water, jobs, roads and education to this crippled country.

But the results so far — or lack of them — threaten to do more harm than good.

The reconstruction efforts have stalled and stumbled at many turns since the U.S. military arrived in 2001, undermining President Barack Obama's vow to deliver a safer, stable Afghanistan capable of stamping out the insurgency and keeping al-Qaida from re-establishing its bases here.

Poppy fields thrive, with each harvest of illegal opium fattening the bankrolls of terrorists and drug barons. Passable roads remain scarce and unprotected, isolating millions of Afghans who remain cut off from jobs and education. Electricity flows to only a fraction of the country's 29 million people.

Case in point: a $100 million diesel-fueled power plant that was supposed to be built swiftly to deliver electricity to more than 500,000 residents of Kabul, the country's largest city. The plant's costs tripled to $305 million as construction lagged a year behind schedule, and now it often sits idle because the Afghans were able to import cheaper power from a neighboring country before the plant came online.

What went wrong?

The failures of the power plant project are, in many ways, the failures of often ill-conceived efforts to modernize Afghanistan:

The Afghans fell back into bad habits that favored short-term, political decisions over wiser, long-term solutions. The U.S. wasted money and might by deferring to the looming deadline and seeming desirability of Afghan President Hamid Karzai's re-election efforts. And a U.S. contractor benefited from a development program that essentially gives vendors a blank check, allowing them to reap millions of dollars in additional profits with no consequences for mistakes.

Rebuilding Afghanistan is an international effort, but the U.S. alone has committed $51 billion to the project since 2001, and plans to raise the stakes to $71 billion over the next year — more than it has spent on reconstruction in Iraq since 2003.

Roughly half the money is going to bolster the Afghan army and police, with the rest earmarked for shoring up the country's crumbling infrastructure and inadequate social services.

There have been reconstruction successes, such as rebuilding a national highway loop left crumbling after decades of war, constructing or improving thousands of schools, and creating a network of health clinics.

But the number of Afghans with access to electricity has only inched up from 6 percent in 2001 to an estimated 10 percent now, well short of the development goal to provide power to 65 percent of urban and 25 percent of rural households by the end of this year.

Too many major projects are not delivering what was promised to the people, and rapidly dumping billions of reconstruction dollars into such an impoverished country is in some ways making matters worse, not better, Afghan Finance Minister Omar Zakhilwal says.

The U.S and its partners have wasted billions of dollars and spent billions more without consulting Afghan officials, Zakhilwal says.

All of that has ramped up corruption, undermined efforts to build a viable Afghan government, stripped communities of self-reliance by handing out cash instead of real jobs, and delivered projects like the diesel plant that the country can't afford, he says.

"The indicator of success in Afghanistan has been the wrong indicator... it has been spending," Zakhilwal says. "It has not been output. It has not been the impact."

That's certainly true when it comes to electricity. Afghanistan consumes less energy per person than any other country in the world, even after years of reconstruction efforts, according to data compiled by the U.S. government.

The $305 million diesel power plant, which has dubbed the most expensive plant of its type in the world, represents the biggest single investment the U.S. has made thus far to light up the country.

In 2007, the U.S. had rushed to build the plant in time to help Karzai win re-election, a hectic and unrealistic timetable embraced by the Afghan president that led to the jarring cost increases.

Complaints had piled up about Karzai's inability to deliver reliable power to Kabul, let alone the rest of the country.

"That question became very loud in many people's mind, and the media and the press, 'They haven't been able to bring power to Kabul,'" says Ahmad Wali Shairzay, Afghanistan's former deputy minister of water and energy.

The U.S. and other international donors had spent years helping Afghanistan develop an energy strategy, one focused on reducing the country's reliance on diesel as a primary power source, since it was too costly and too hard to acquire.

The goal was to buy cheaper electricity from neighboring countries and develop Afghanistan's own natural resources, such as water, natural gas and coal.

All of that was abandoned with the decision by U.S. and Afghan officials to build the diesel plant on the outskirts of Kabul.

Never mind that the plant would make the country more, not less, reliant on its fickle neighbors for power. Never mind that Karzai's former finance minister pleaded with U.S. officials to drop the idea.

The U.S. plowed ahead, turning the project over to a pair of American contractors, including one already scolded for wasting millions in taxpayer dollars on shoddy reconstruction projects. The U.S. team paid $109 million for 18 new diesel engines to be built — more than the original cost of the plant — only to discover rust and corrosion in several of them.

"The Kabul diesel project was sinful," says Mary Louise Vitelli, a U.S. energy consultant who focused on power development in Afghanistan for six years, working with the U.S., the World Bank and as a special adviser to Karzai's government.

James Bever, the U.S. Agency for International Development's director of the Afghanistan-Pakistan task force, says it's unfair to label the project a failure. Even with the problems, he notes, the plant provides Afghanistan with an additional power source.

"You know, there's a formula in this business. You can have it fast, you can have it high quality, and you can have it low cost. But you cannot have all three at the same time," Bever says.

For Afghans, each nightfall is a reminder of promises not kept.

When darkness comes, there is not much Abdul Rahim and others living in southwest Kabul can do. Without lights, they cannot work, and their children cannot play. Rahim's children sometimes sit around a kerosene lamp to do their homework, their books laid flat in a circle around the flame's flickering light.

"The people who are living in this area, they don't have electricity and it is dark everywhere," Rahim says. "Day and night, we are counting the minutes to when we will finally get electricity."

The setbacks stretch far beyond Kabul.

Despite spending millions of dollars over more than six years studying the nation's natural gas fields in the north, no plan is in place to tap that substantial resource for power. And a huge project to expand hydropower in the south that already has cost about $90 million is delayed by continued fighting in the region, which has long been a Taliban stronghold.

Only 497,000 of the country's 4.8 million households are connected to what passes for a national power grid, despite more than $1.6 billion already spent on energy projects, according to data from the country's utility corporation.

The system is more like a disconnected patchwork of pockets of available electricity, serving different regions of the country, some with hydropower, some with power imported from nearby countries and some with diesel-generated power.

So Afghans improvise at home, and many hotels and businesses — even embassies and international agencies — rely on their own generators for power. And some sell electricity to their neighbors.

Take Qurban Ali's old, crank-operated diesel generator, which coughs and belches black smoke before the engine starts running. His generator provides electricity to more than 100 houses in the Dasht-i-barchi neighborhood in Kabul, where Rahim lives.

"Right now, we are hopeless to have electricity," Ali says.

Afghans who can afford it pay private generator owners by the light bulb, about $2.60 a month for each bulb hanging from the ceiling. It costs nearly $11 a month to power a television. The average income in Afghanistan is a little more than a dollar a day.

The diesel plant that was supposed to serve Kabul was not ready to be turned over to the Afghan government until May 2010. Today, it runs mostly only for short periods, producing only a fraction of its promised 100 million watts of power.

"This power plant is too expensive for us to use," says Shojauddin Ziaie, Afghanistan's current deputy minister of water and energy.

U.S. contractor Black & Veatch oversaw the project for USAID as part of a joint $1.4 billion contract with The Louis Berger Group, another American contractor.

As the plant's costs and schedule veered wildly off course, the payouts to Black & Veatch also ballooned.

USAID refused to disclose the amounts paid as costs increased, but contract records obtained by The Associated Press show expenses and fees paid to the company tripled from $15.3 million in July 2007, when the project was estimated at $125.8 million overall, to $46.2 million in October 2009, when the price tag reached $301 million.

Greg Clum, a Black & Veatch vice president, defended the project, calling the plant a "critical piece in our ability to help Afghanistan get its legs under itself and to be able to become a sustainable, growing economic player in the region."

Black & Veatch and The Louis Berger group landed the contract in 2006.

The next year, congressional investigators chastised Berger's work on an earlier contract to build schools and health clinics, accusing the company of poor performance and misrepresenting work.

USAID also found problems with the two companies under their current contract, which an internal assessment found put too much risk on the agency and too little on the contractors, who had no incentive to control spending.

In March 2009, with more than half of the $1.4 billion already committed, the agency said it had "lost confidence" in the companies' abilities to do reconstruction work in Afghanistan. Yet the contract continues, with both the agency and the contractors saying management has improved.

"We had a rough patch," says Larry Walker, president of Louis Berger.

Shairzay, the former deputy energy minister, says Afghans view the diesel plant as a nice, expensive gift.

"Instead of giving me a small car, you give me really a Jaguar," he says. "And it will be up to me whether I use it, or just park it and look at it."

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Electricity use actually increased during 2018 Earth Hour, BC Hydro

Earth Hour BC highlights BC Hydro data on electricity use, energy savings, and participation in the Lower Mainland and Vancouver Island amid climate change and hydroelectric power dynamics.

 

Key Points

BC observance tracking BC Hydro electricity use and conservation during Earth Hour, amid hydroelectric power dominance.

✅ BC Hydro reports rising electricity use during Earth Hour 2018

✅ Savings fell from 2% in 2008 to near zero province-wide

✅ Hydroelectric grid yields low GHG emissions in BC

 

For the first time since it began tracking electricity use in the province during Earth Hour, BC Hydro said customers used more power during the 60-minute period when lights are expected to dim, mirroring all-time high electricity demand seen recently.

The World Wildlife Fund launched Earth Hour in Sydney, Australia in 2007. Residents and businesses there turned off lights and non-essential power as a symbol to mark the importance of combating climate change.

The event was adopted in B.C. the next year and, as part of that, BC Hydro began tracking the megawatt hours saved.

#google#

In 2008, residents and businesses achieved a two per cent savings in electricity use. But since then, BC Hydro says the savings have plummeted.

The event was adopted in B.C. the next year and, as part of that, BC Hydro began tracking the megawatt hours saved.

In 2008, residents and businesses achieved a two per cent savings in electricity use. But since then, BC Hydro says the savings have plummeted, as record-breaking demand in 2021 and beyond changed consumption patterns.

 

Lights on

For Earth Hour this year, which took place 8:30-9:30 p.m. on March 24, BC Hydro says electricity use in the Lower Mainland increased by 0.5 per cent, even as it activated a winter payment plan to help customers manage bills. On Vancouver Island it increased 0.6 per cent.

In the province's southern Interior and northern Interior, power use remained the same during the event.

On Friday, the utility released a report called: "lights out". Why Earth Hour is dimming in BC. which explores the decline of energy savings related to Earth Hour in the province.

The WWF says the way in which hydro companies track electricity savings during Earth Hour is not an accurate measure of participation, and tracking of emerging loads like crypto mining electricity use remains opaque, and noted that more countries than ever are turning off lights for the event.

For 2018, the WWF shifted the focus of Earth Hour to the loss of wildlife across the globe.

BC Hydro says in its report that the symbolism of Earth Hour is still important to British Columbians, but almost all power generation in B.C. is hydroelectric, though recent drought conditions have required operational adjustments, and only accounts for one per cent of greenhouse gas emissions.

 

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Cost, safety drive line-burying decisions at Tucson Electric Power

TEP Undergrounding Policy prioritizes selective underground power lines to manage wildfire risk, engineering costs, and ratepayer impacts, balancing transmission and distribution reliability with right-of-way, safety, and vegetation management per Arizona regulators.

 

Key Points

A selective TEP approach to bury lines where safety, engineering, and cost justify undergrounding.

✅ Selective undergrounding for feeders near substations

✅ Balances wildfire mitigation, reliability, and ratepayer costs

✅ Follows ACC rules, BLM and USFS vegetation management

 

Though wildfires in California caused by power lines have prompted calls for more underground lines, Tucson Electric Power Co. plans to keep to its policy of burying lines selectively for safety.

Like many other utilities, TEP typically doesn’t install its long-range, high-voltage transmission lines, such as the TransWest Express project, and distribution equipment underground because of higher costs that would be passed on to ratepayers, TEP spokesman Joe Barrios said.

But the company will sometimes bury lower-voltage lines and equipment where it is cost-effective or needed for safety as utilities adapt to climate change across North America, or if customers or developers are willing to pay the higher installation costs

Underground installations generally include additional engineering expenses, right-of-way acquisition for projects like the New England Clean Power Link in other regions, and added labor and materials, Barrios said.

“This practice avoids passing along unnecessary costs to customers through their rates, so that all customers are not asked to subsidize a discretionary expenditure that primarily benefits residents or property owners in one small area of our service territory,” he said, adding that the Arizona Corporation Commission has supported the company’s policy.

Even so, TEP will place equipment underground in some circumstances if engineering or safety concerns, including electrical safety tips that utilities promote during storm season, justify the additional cost of underground installation, Barrios said.

In fact, lower-voltage “feeder” lines emerging from distribution substations are typically installed underground until the lines reach a point where they can be safely brought above ground, he added.

While in California PG&E has shut off power during windy weather to avoid wildfires in forested areas traversed by its power lines after events like the Drum Fire last June, TEP doesn’t face the same kind of wildfire risk, Barrios said.

Most of TEP’s 5,000 miles of transmission and distribution lines aren’t located in heavily forested areas that would raise fire concerns, though large urban systems have seen outages after station fires in Los Angeles, he said.

However, TEP has an active program of monitoring transmission lines and trimming vegetation to maintain a fire-safety buffer zone and address risks from vandalism such as copper theft where applicable, in compliance with federal regulations and in cooperation with the U.S. Bureau of Land Management and the U.S. Forest Service.

 

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Ontario to Provide New and Expanded Energy-Efficiency Programs

Ontario CDM Programs expand energy efficiency, demand response, and DER incentives via IESO's Save on Energy, cutting peak demand, lowering bills, and supporting electrification, retrofits, and LED lighting to meet Ontario's growing electricity needs.

 

Key Points

Ontario CDM Programs are IESO incentives that cut peak demand and energy use via demand response, retrofits and DERs.

✅ Delivered by IESO's Save on Energy to reduce peak demand

✅ Incentives for demand response, retrofits, LEDs, and DER solutions

✅ Help homes, businesses, and greenhouses lower bills and emissions

 

Ontario will be making available four new and expanded energy-efficiency programs, also known as Conservation and Demand Management (CDM) programs, to ensure a reliable, affordable, and clean electricity system, including ultra-low overnight pricing options to power the province, drive electrification and support strong economic growth. As there will be a need for additional electricity capacity in Ontario beginning in 2025, and continuing through the decade, CDM programs are among the fastest and most cost-effective ways of meeting electricity system needs.

 

Conservation and Demand Management

The Ontario government launched the 2021-2024 CDM Framework on January 1, 2021. The framework focuses on cost-effectively meeting the needs of Ontario’s electricity system, including by focusing on the achievement of provincial peak demand reductions and initiatives such as extended off-peak electricity rates, as well as on targeted approaches to address regional and/or local electricity system needs.

CDM programs are delivered by the Independent Electricity System Operator (IESO), which implemented staff lockdown measures during COVID-19, through the Save on Energy brand. These programs address electricity system needs and help consumers reduce their electricity consumption to lower their bills. CDM programs and incentives are available for homeowners, small businesses, large businesses, and contractors, and First Nations communities.

 

New and Expanded Programs

The four new and expanded CDM programs will include:

A new Residential Demand Response Program for homes with existing central air conditioning and smart thermostats to help deliver peak demand reductions. Households who meet the criteria could voluntarily enroll in this program and, alongside protections like disconnection moratoriums for residential customers, be paid an incentive in return for the IESO being able to reduce their cooling load on a select number of summer afternoons to reduce peak demand. There are an estimated 600,000 smart thermostats installed in Ontario.
Targeted support for greenhouses in Southwest Ontario, including incentives to install LED lighting, non-lighting measures or behind-the-meter distributed energy resources (DER), such as combined solar generation and battery storage.
Enhancements to the Save On Energy Retrofit Program for business, municipalities, institutional and industrial consumers to include custom energy-efficiency projects. Examples of potential projects could include chiller and other HVAC upgrades for a local arena, building automation and air handling systems for a hospital, or building envelope upgrades for a local business.
Enhancements to the Local Initiatives Program to reduce barriers to participation and to add flexibility for incentives for DER solutions.
It is the government’s intention that the new and expanded CDM programs will be available to eligible electricity customers beginning in Spring 2023.

The IESO estimates that the new program offers will deliver total provincial peak electricity demand savings of 285 megawatts (MW) and annual energy savings of 1.1 terawatt hours (TWh) by 2025, reflecting pandemic-era electricity usage shifts across Ontario. Savings will persist beyond 2025 with a total reduction in system costs by approximately $650 million over the lifetime of the measures, and will support economic recovery, as seen with electricity relief during COVID-19 measures, decarbonization and energy cost management for homes and businesses.

These enhancements will have a particular impact in Southwest Ontario, with regional peak demand savings of 225 MW, helping to alleviate electricity system constraints in the region and foster economic development, supported by stable electricity pricing for industrial and commercial companies in Ontario.

The overall savings from this CDM programming will result in an estimated three million tonnes of greenhouse gas emissions reductions over the lifetime of the energy-efficiency measures to help achieve Ontario’s climate targets and protect the environment for the future.

The IESO will be updating the CDM Framework Program Plan, which provides a detailed breakdown of program budgets and energy savings and peak demand targets expected to be achieved.

 

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Ukraine Prepares for Winter Amid Energy Challenges

Ukraine Winter Energy Resilience focuses on energy security, grid repairs, renewable power, EU support, heating reliability, electricity imports, and conservation measures to stabilize infrastructure and protect households amid conflict and severe cold.

 

Key Points

A strategy to secure heat and power via repairs, renewables, imports, and conservation during wartime winter.

✅ Grid repairs and hardening of power plants and transmission lines

✅ Diversified supply: renewables, electricity imports, fuel reserves

✅ Public conservation to cut peak demand and safeguard essential services

 

As winter approaches, Ukraine is bracing for a challenging season, especially in the energy sector amid global energy instability and price pressures, which has been heavily impacted by the ongoing conflict with Russia. With the weather forecast predicting colder temperatures, the Ukrainian government is ramping up efforts to secure energy supplies and bolster infrastructure, aiming to ensure that citizens have access to heating and electricity during the harsh months ahead.

The Energy Landscape in Ukraine

The conflict has severely disrupted Ukraine’s energy infrastructure, leading to widespread damage and inefficiencies. Key facilities, including power plants and transmission lines, have been targeted amid energy ceasefire violations reported by both sides, resulting in significant energy shortages. As a response, the government has implemented a series of measures aimed at stabilizing the energy sector, ensuring that the nation can withstand the winter months.

One of the primary strategies has been the repair and reinforcement of energy infrastructure. Officials have prioritized critical facilities that are essential for electricity generation and distribution. Emergency repairs and upgrades are being carried out to restore functionality and improve resilience against potential attacks.

In addition to repairing existing infrastructure, Ukraine is actively seeking to diversify its energy sources. This includes increasing reliance on renewable energy, such as wind and solar, which can be less susceptible to disruption. The shift toward renewables not only enhances energy security and supports moving away from fossil fuels in line with Ukraine's long-term environmental goals.

International Support and Collaboration

Ukraine's challenges have not gone unnoticed on the international stage. Countries and organizations around the world have pledged energy security support to help Ukraine fortify its energy sector. This assistance includes financial aid, technical expertise, and the provision of materials needed for infrastructure repairs.

The European Union, in particular, has been a key ally, providing both immediate and long-term support to Ukraine's energy efforts. The EU's commitment to helping Ukraine transition to a more sustainable energy model, including steps toward ENTSO-E synchronization to bolster grid stability, is reflected in various initiatives aimed at increasing energy efficiency and integrating renewable sources.

Furthermore, international organizations have mobilized resources to assist in the restoration of damaged infrastructure. This collaboration not only enhances Ukraine's energy capabilities but also strengthens ties with global partners, fostering a sense of solidarity amidst the ongoing conflict.

Preparing for Winter Challenges

As temperatures drop, the demand for heating will surge, putting additional pressure on an already strained energy system. To address this, the Ukrainian government is urging citizens to prepare for potential shortages. Officials are promoting energy conservation measures, encouraging households to reduce consumption and use energy more efficiently.

Public awareness campaigns are being launched to educate citizens about the importance of energy saving and the steps they can take to minimize their energy use and prevent outages during peak demand. These initiatives aim to foster a collective sense of responsibility as the nation braces for the winter ahead.

In addition to conservation efforts, the government is exploring alternative energy supplies. This includes negotiating with neighboring countries for electricity imports and enhancing domestic production where feasible. By securing a diverse range of energy sources, Ukraine aims to mitigate the risk of shortages and ensure that essential services remain operational.

The Role of Resilience and Innovation

Despite the challenges, the resilience of the Ukrainian people and their commitment to overcoming adversity shine through. Communities are coming together to support one another, sharing resources and information to help navigate the difficulties of winter.

Innovative solutions are also emerging as part of the response to the energy crisis. Local initiatives aimed at promoting energy efficiency and the use of alternative energy sources are gaining traction. From community-led solar projects to energy-efficient building practices, Ukrainians are finding ways to adapt and thrive even in the face of uncertainty.

Looking Ahead

As Ukraine prepares for the winter months, the focus remains on ensuring energy security and maintaining the functionality of critical infrastructure. While challenges loom, the collective efforts of the government, international partners, and citizens demonstrate a strong commitment to resilience and adaptation.

In conclusion, the upcoming winter presents significant challenges for Ukraine's energy sector, yet the nation's determination to secure its energy future remains unwavering. With ongoing repairs, international support, and community innovation, Ukraine is working diligently to navigate the complexities of this winter, aiming to emerge stronger and more resilient in the face of adversity. The resilience shown today will be crucial as the country continues to confront the ongoing impacts of conflict and seeks to build a sustainable future.

 

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Ontario pitches support for electric bills

Ontario CEAP Program provides one-time electricity bill relief for residential consumers via local utilities, supports low-income households, aligns with COVID-19 recovery rates, and complements time-of-use pricing options and the winter disconnection ban.

 

Key Points

A one-time electricity bill credit for eligible Ontario households affected by COVID-19, available via local utilities.

✅ Apply through your local distribution company or utility

✅ One-time credit for overdue electricity bills from COVID-19

✅ Complements TOU options, OER, and winter disconnection ban

 

Applications for the CEAP program for Ontario residential consumers has opened. Residential customers across the province can now apply for funding through their local distribution company/utility.

On June 1st, our government announced a suite of initiatives to support Ontario’s electricity consumers amid changes for electricity consumers during the pandemic, including a $9 million investment to support low-income Ontarians through the COVID-19 Energy Assistance Program (CEAP). CEAP will provide a one-time payment to Ontarians who are struggling to pay down overdue electricity bills incurred during the COVID-19 outbreak.

These initiatives include:

  • $9 million for the COVID-19 Energy Assistance Program (CEAP) to support consumers struggling to pay their energy bills during the pandemic. CEAP will provide one-time payments to consumers to help pay down any electricity bill debt incurred over the COVID19 period. Applications will be available through local utilities in the upcoming months;
  • $8 million for the COVID-19 Energy Assistance Program for Small Business (CEAP-SB) to provide support to businesses struggling with bill payments as a result of the outbreak; and
  • An extension of the Ontario Energy Board’s winter disconnection ban until July 31, 2020 to ensure no one is disconnected from their natural gas or electricity service during these uncertain times.


More information about applications for the CEAP for Small Business will be coming later this summer, as electricity rates are about to change across Ontario for many customers.

In addition, the government recently announced that it will continue the suspension of time-of-use (TOU) electricity rates and, starting on June 1, 2020, customers will be billed based on a new fixed COVID-19 hydro rate of 12.8 cents per kilowatt hour. The COVID-19 Recovery Rate, which some warned in analysis could lead to higher hydro bills will be in place until October 31, 2020.

Later in the pandemic, Ontario set electricity rates at the off-peak price until February 7 to provide additional relief.

“Starting November 1, 2020, our government has announced Ontario electricity consumers will have the option to choose between time-of-use and tiered electricity pricing plan, following the Ontario Energy Board’s new rate plan prices and support thresholds announcement. We are proud to soon offer Ontarians the ability to choose an electricity plan that best suits for their lifestyle,” said Jim McDonell, MPP for Stormont–Dundas–South Glengarry.

The government will continue to subsidize electricity bills by 31.8 per cent through the Ontario Electricity Rebate.

The government is providing approximately $5.6 billion in 2020-21 as part of its existing electricity cost relief programs and conservation initiatives such as the Peak Perks program to help ensure more affordable electricity bills for eligible residential, farm and small business consumers.

 

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Turning thermal energy into electricity

Near-Field Thermophotovoltaics captures radiated energy across a nanoscale gap, using thin-film photovoltaic cells and indium gallium arsenide to boost power density and efficiency, enabling compact Army portable power from emitters via radiative heat transfer.

 

Key Points

A nanoscale TPV method capturing near-field photons for higher power density at lower emitter temperatures.

✅ Nanoscale gap boosts radiative transfer and usable photon flux

✅ Thin-film InGaAs cells recycle sub-band-gap photons via reflector

✅ Achieved ~5 kW/m2 power density with higher efficiency

 

With the addition of sensors and enhanced communication tools, providing lightweight, portable power has become even more challenging, with concepts such as power from falling snow illustrating how diverse new energy-harvesting approaches are. Army-funded research demonstrated a new approach to turning thermal energy into electricity that could provide compact and efficient power for Soldiers on future battlefields.

Hot objects radiate light in the form of photons into their surroundings. The emitted photons can be captured by a photovoltaic cell and converted to useful electric energy. This approach to energy conversion is called far-field thermophotovoltaics, or FF-TPVs, and has been under development for many years; however, it suffers from low power density and therefore requires high operating temperatures of the emitter.

The research, conducted at the University of Michigan and published in Nature Communications, demonstrates a new approach, where the separation between the emitter and the photovoltaic cell is reduced to the nanoscale, enabling much greater power output than what is possible with FF-TPVs for the same emitter temperature.

This approach, which enables capture of energy that is otherwise trapped in the near-field of the emitter is called near-field thermophotovoltaics or NF-TPV and uses custom-built photovoltaic cells and emitter designs ideal for near-field operating conditions, alongside emerging smart solar inverters that help manage conversion and delivery.

This technique exhibited a power density almost an order of magnitude higher than that for the best-reported near-field-TPV systems, while also operating at six-times higher efficiency, paving the way for future near-field-TPV applications, including remote microgrid deployments in extreme environments, according to Dr. Edgar Meyhofer, professor of mechanical engineering, University of Michigan.

"The Army uses large amounts of power during deployments and battlefield operations and must be carried by the Soldier or a weight constrained system," said Dr. Mike Waits, U.S. Army Combat Capabilities Development Command's Army Research Laboratory. "If successful, in the future near-field-TPVs could serve as more compact and higher efficiency power sources for Soldiers as these devices can function at lower operating temperatures than conventional TPVs."

The efficiency of a TPV device is characterized by how much of the total energy transfer between the emitter and the photovoltaic cell is used to excite the electron-hole pairs in the photovoltaic cell, where insights from near-light-speed conduction research help contextualize performance limits in semiconductors. While increasing the temperature of the emitter increases the number of photons above the band-gap of the cell, the number of sub band-gap photons that can heat up the photovoltaic cell need to be minimized.

"This was achieved by fabricating thin-film TPV cells with ultra-flat surfaces, and with a metal back reflector," said Dr. Stephen Forrest, professor of electrical and computer engineering, University of Michigan. "The photons above the band-gap of the cell are efficiently absorbed in the micron-thick semiconductor, while those below the band-gap are reflected back to the silicon emitter and recycled."

The team grew thin-film indium gallium arsenide photovoltaic cells on thick semiconductor substrates, and then peeled off the very thin semiconductor active region of the cell and transferred it to a silicon substrate, informing potential interfaces with home battery systems for distributed use.

All these innovations in device design and experimental approach resulted in a novel near-field TPV system that could complement distributed resources in virtual power plants for resilient operations.

"The team has achieved a record ~5 kW/m2 power output, which is an order of magnitude larger than systems previously reported in the literature," said Dr. Pramod Reddy, professor of mechanical engineering, University of Michigan.

Researchers also performed state-of-the-art theoretical calculations to estimate the performance of the photovoltaic cell at each temperature and gap size, informing hybrid designs with backup fuel cell solutions that extend battery life, and showed good agreement between the experiments and computational predictions.

"This current demonstration meets theoretical predictions of radiative heat transfer at the nanoscale, and directly shows the potential for developing future near-field TPV devices for Army applications in power and energy, communication and sensors," said Dr. Pani Varanasi, program manager, DEVCOM ARL that funded this work.

 

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