LIPA riles critics by hiring an outside consultant

Space solar power promises wireless energy from orbital solar satellites via microwave or laser power beaming, using photovoltaics and rectennas. NRL and AFRL advances hint at 24-7 renewable power delivery to Earth and airborne drones.

Key Points

Space solar power beams orbital solar energy to Earth via microwaves or lasers, enabling continuous wireless electricity.

✅ Harvests sunlight in orbit and transmits via microwaves or lasers

✅ Provides 24-7 renewable power, independent of weather or night

✅ Enables wireless power for remote sites, grids, and drones

Earlier this year, a small group of spectators gathered in David Taylor Model Basin, the Navy’s cavernous indoor wave pool in Maryland, to watch something they couldn’t see. At each end of the facility there was a 13-foot pole with a small cube perched on top. A powerful infrared laser beam shot out of one of the cubes, striking an array of photovoltaic cells inside the opposite cube. To the naked eye, however, it looked like a whole lot of nothing. The only evidence that anything was happening came from a small coffee maker nearby, which was churning out “laser lattes” using only the power generated by the system as ambitions for cheap abundant electricity gain momentum worldwide.

The laser setup managed to transmit 400 watts of power—enough for several small household appliances—through hundreds of meters of air without moving any mass. The Naval Research Lab, which ran the project, hopes to use the system to send power to drones during flight. But NRL electronics engineer Paul Jaffe has his sights set on an even more ambitious problem: beaming solar power to Earth from space. For decades the idea had been reserved for The Future, but a series of technological breakthroughs and a massive new government research program suggest that faraway day may have finally arrived as interest in space-based solar broadens across industry and government.

Since the idea for space solar power first cropped up in Isaac Asimov’s science fiction in the early 1940s, scientists and engineers have floated dozens of proposals to bring the concept to life, including inflatable solar arrays and robotic self-assembly. But the basic idea is always the same: A giant satellite in orbit harvests energy from the sun and converts it to microwaves or lasers for transmission to Earth, where it is converted into electricity. The sun never sets in space, so a space solar power system could supply renewable power to anywhere on the planet, day or night, as recent tests show we can generate electricity from the night sky as well, rain or shine.

Like fusion energy, space-based solar power seemed doomed to become a technology that was always 30 years away. Technical problems kept cropping up, cost estimates remained stratospheric, and as solar cells became cheaper and more efficient, and storage improved with cheap batteries, the case for space-based solar seemed to be shrinking.

That didn’t stop government research agencies from trying. In 1975, after partnering with the Department of Energy on a series of space solar power feasibility studies, NASA beamed 30 kilowatts of power over a mile using a giant microwave dish. Beamed energy is a crucial aspect of space solar power, but this test remains the most powerful demonstration of the technology to date. “The fact that it’s been almost 45 years since NASA’s demonstration, and it remains the high-water mark, speaks for itself,” Jaffe says. “Space solar wasn’t a national imperative, and so a lot of this technology didn’t meaningfully progress.”

John Mankins, a former physicist at NASA and director of Solar Space Technologies, witnessed how government bureaucracy killed space solar power development firsthand. In the late 1990s, Mankins authored a report for NASA that concluded it was again time to take space solar power seriously and led a project to do design studies on a satellite system. Despite some promising results, the agency ended up abandoning it.

In 2005, Mankins left NASA to work as a consultant, but he couldn’t shake the idea of space solar power. He did some modest space solar power experiments himself and even got a grant from NASA’s Innovative Advanced Concepts program in 2011. The result was SPS-ALPHA, which Mankins called “the first practical solar power satellite.” The idea, says Mankins, was “to build a large solar-powered satellite out of thousands of small pieces.” His modular design brought the cost of hardware down significantly, at least in principle.

Jaffe, who was just starting to work on hardware for space solar power at the Naval Research Lab, got excited about Mankins’ concept. At the time he was developing a “sandwich module” consisting of a small solar panel on one side and a microwave transmitter on the other. His electronic sandwich demonstrated all the elements of an actual space solar power system and, perhaps most important, it was modular. It could work beautifully with something like Mankins' concept, he figured. All they were missing was the financial support to bring the idea from the laboratory into space.

Jaffe invited Mankins to join a small team of researchers entering a Defense Department competition, in which they were planning to pitch a space solar power concept based on SPS-ALPHA. In 2016, the team presented the idea to top Defense officials and ended up winning four out of the seven award categories. Both Jaffe and Mankins described it as a crucial moment for reviving the US government’s interest in space solar power.

They might be right. In October, the Air Force Research Lab announced a $100 million program to develop hardware for a solar power satellite. It’s an important first step toward the first demonstration of space solar power in orbit, and Mankins says it could help solve what he sees as space solar power’s biggest problem: public perception. The technology has always seemed like a pie-in-the-sky idea, and the cost of setting up a solar array on Earth is plummeting, as proposals like a tenfold U.S. solar expansion signal rapid growth; but space solar power has unique benefits, chief among them the availability of solar energy around the clock regardless of the weather or time of day.

It can also provide renewable energy to remote locations, such as forward operating bases for the military, which has deployed its first floating solar array to bolster resilience. And at a time when wildfires have forced the utility PG&E to kill power for thousands of California residents on multiple occasions, having a way to provide renewable energy through the clouds and smoke doesn’t seem like such a bad idea. (Ironically enough, PG&E entered a first-of-its-kind agreement to buy space solar power from a company called Solaren back in 2009; the system was supposed to start operating in 2016 but never came to fruition.)

“If space solar power does work, it is hard to overstate what the geopolitical implications would be,” Jaffe says. “With GPS, we sort of take it for granted that no matter where we are on this planet, we can get precise navigation information. If the same thing could be done for energy, especially as peer-to-peer energy sharing matures, it would be revolutionary.”

Indeed, there seems to be an emerging race to become the first to harness this technology. Earlier this year China announced its intention to become the first country to build a solar power station in space, and for more than a decade Japan has considered the development of a space solar power station to be a national priority. Now that the US military has joined in with a $100 million hardware development program, it may only be a matter of time before there’s a solar farm in the solar system.

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Utility Battery Storage Rankings measure grid-connected capacity, not ownership, highlighting MW, MWh, and watts per customer across PJM, MISO, and California IOUs, featuring Duke Energy, IPL, ancillary services, and frequency regulation benefits.

Key Points

Rankings that track energy storage connected to utility grids, comparing MW, MWh, and W/customer rather than ownership.

✅ Ranks by MW, MWh, and watts per customer, not asset ownership

✅ Highlights PJM, MISO cases and California IOUs' deployments

✅ Examples: Duke Energy, IPL, IID; ancillary services, frequency response

The rankings do not tally how much energy storage a utility built or owns, but how much was connected to their system. So while IPL built and owns the storage facility in its territory, Duke does not own the 16 MW of storage that connected to its system in 2016. Similarly, while California’s utilities are permitted to own some energy storage assets, they do not necessarily own all the storage facilities connected to their systems.

Measured by energy (MWh), IPL ranked fourth with 20 MWh, and Duke Energy Ohio ranked eighth with 6.1 MWh.

Ranked by energy storage watts per customer, IPL and Duke actually beat the California utilities, ranking fifth and sixth with 42 W/customer and 23 W/customer, respectively.

Duke ready for next step

Given Duke’s plans, including projects in Florida that are moving ahead, the utility is likely to stay high in the rankings and be more of a driving force in development. “Battery technology has matured, and we are ready to take the next step,” Duke spokesman Randy Wheeless told Utility Dive. “We can go to regulators and say this makes economic sense.”

Duke began exploring energy storage in 2012, and until now most of its energy storage efforts were focused on commercial projects in competitive markets where it was possible to earn revenues. Those included its 36 MW Notrees battery storage project developed in partnership with the Department of Energy in 2012 that provides frequency regulation for the Electric Reliability Council of Texas market and two 2 MW storage projects at its retired W.C. Beckjord plant in New Richmond, Ohio, that sells ancillary services into the PJM Interconnection market.

On the regulated side, most of Duke’s storage projects have had “an R&D slant to them,” Wheeless said, but “we are moving beyond the R&D concept in our regulated territory and are looking at storage more as a regulated asset.”

“We have done the demos, and they have proved out,” Wheeless said. Storage may not be ready for prime time everywhere, he said, but in certain locations, especially where it can it can be used to do more than one thing, it can make sense.

Wheeless said Duke would be making “a number of energy storage announcements in the next few months in our regulated states.” He could not provide details on those projects.

More flexible resources
Location can be a determining factor when building a storage facility. For IPL, serving the wholesale market was a driving factor in the rationale to build its 20 MW, 20 MWh storage facility in Indianapolis.

IPL built the project to address a need for more flexible resources in light of “recent changes in our resource mix,” including decreasing coal-fired generation and increasing renewables and natural gas-fired generation, as other regions plan to rely on battery storage to meet rising demand, Joan Soller, IPL’s director of resource planning, told Utility Dive in an email. The storage facility is used to provide primary frequency response necessary for grid stability.

The Harding Street storage facility in May. It was the first energy storage project in the Midcontinent ISO. But the regulatory path in MISO is not as clear as it is in PJM, whereas initiatives such as Ontario storage framework are clarifying participation. In November, IPL with the Federal Energy Regulatory Commission, asking the regulator to find that MISO’s rules for energy storage are deficient and should be revised.

Soller said IPL has “no imminent plans to install energy storage in the future but will continue to monitor battery costs and capabilities as potential resources in future Integrated Resource Plans.”

California legislative and regulatory push

In California, energy storage did not have to wait for regulations to catch up with technology. With legislative and regulatory mandates, including CEC long-duration storage funding announced recently, as a push, California’s IOUs took high places in SEPA’s rankings.

Southern California Edison and San Diego Gas & Electric were first and fourth (63.2 MW and 17.2 MW), respectively, in terms of capacity. SoCal Ed and SDG&E were first and second (104 MWh and 28.4 MWh), respectively, and Pacific Gas and Electric was fifth (17 MWh) in terms of energy.

But a public power utility, the Imperial Irrigation District (IID), ended up high in the rankings – second in capacity (30 MW) and third  in energy (20 MWh) – even though as a public power entity it is not subject to the state’s energy storage mandates.

But while IID was not under state mandate, it had a compelling regulatory reason to build the storage project. It was part of a settlement reached with FERC over a September 2011 outage, IID spokeswoman Marion Champion said.

IID agreed to a $12 million fine as part of the settlement, of which $9 million was applied to physical improvements of IID’s system.

IID ended up building a 30 MW, 20 MWh lithium-ion battery storage system at its El Centro generating station. The system went into service in October 2016 and in May, IID used the system’s 44 MW combined-cycle natural gas turbine at the generating station.

Passing savings to customers
The cost of the storage system was about $31 million, and based on its experience with the El Centro project, Champion said IID plans to add to the existing batteries. “We are continuing to see real savings and are passing those savings on to our customers,” she said.

Champion said the battery system gives IID the ability to provide ancillary services without having to run its larger generation units, such as El Centro Unit 4, at its minimum output. With gas prices at $3.59 per million British thermal units, it costs about $26,880 a day to run Unit 4, she said.

IID’s territory is in southeastern California, an area with a lot of renewable resources. IID is also not part of the California ISO and acts as its own balancing authority. The battery system gives the utility greater operational flexibility, in addition to the ability to use more of the surrounding renewable resources, Champion said.

In May, IID’s board gave the utility’s staff approval to enter into contract negotiations for a 7 MW, 4 MWh expansion of its El Centro storage facility. The negotiations are ongoing, but approval could come in the next couple months, Champion said.

The heart of the issue, though, is “the ability of the battery system to lower costs for our ratepayers,” Champion said. “Our planning section will continue to utilize the battery, and we are looking forward to its expansion,” she said.” I expect it will play an even more important role as we continue to increase our percentage of renewables.”

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TotalEnergies VSB Acquisition accelerates renewable energy growth, expanding wind and solar portfolios across Germany and Europe, advancing decarbonization, net-zero targets, and the energy transition through a US$1.65 billion strategic clean power investment.

Key Points

A US$1.65B deal: TotalEnergies acquires VSB to scale wind and solar in Europe and advance net-zero goals.

✅ US$1.65B purchase expands wind and solar pipeline

✅ Strengthens presence in Germany and wider Europe

✅ Advances net-zero, energy transition objectives

In a major move to expand its renewable energy portfolio, French energy giant TotalEnergies has announced its decision to acquire German renewable energy developer VSB for US$1.65 billion. This acquisition represents a significant step in TotalEnergies' strategy to accelerate its transition from fossil fuels to greener energy sources, aligning with the global push towards sustainability and carbon reduction, as reflected in Europe's green surge across key markets.

Strengthening TotalEnergies’ Renewable Energy Portfolio

TotalEnergies has long been one of the largest players in the global energy market, historically known for its oil and gas operations. However, in recent years, the company has made a concerted effort to diversify its portfolio and shift its focus toward renewable energy. The purchase of VSB, a leading developer of wind and solar energy projects, occurs amid rising European wind investment trends and is a clear reflection of TotalEnergies' commitment to this green energy transition.

VSB, based in Dresden, Germany, specializes in the development, construction, and operation of renewable energy projects, particularly wind and solar power. The company has a significant presence in Europe, with a growing portfolio of projects in countries like Germany, where clean energy accounts for 50% of electricity today, Poland, and the Czech Republic. The acquisition will allow TotalEnergies to bolster its renewable energy capacity, particularly in the wind and solar sectors, which are key components of its long-term sustainability goals.

By acquiring VSB, TotalEnergies is not only increasing its renewable energy output but also gaining access to a highly experienced team with a proven track record in energy project development. This move is expected to expedite TotalEnergies’ renewable energy ambitions, enabling the company to build on VSB’s strong market presence and established partnerships across Europe.

VSB’s Strategic Role in the Energy Transition

VSB’s expertise in the renewable energy sector makes it a valuable addition to TotalEnergies' green energy strategy. The company has been at the forefront of the energy transition in Europe, particularly in wind energy development, as offshore wind is set to become a $1 trillion business over the coming decades. Over the years, VSB has completed numerous large-scale wind projects, including both onshore and offshore installations.

The acquisition also positions TotalEnergies to better compete in the rapidly growing European renewable energy market, including the UK, where offshore wind is powering up alongside strong demand due to increased governmental focus on achieving net-zero emissions by 2050. Germany, in particular, has set ambitious renewable energy targets as part of its Energiewende initiative, which aims to reduce the country’s carbon emissions and increase the share of renewables in its energy mix. By acquiring VSB, TotalEnergies is not only enhancing its capabilities in Germany but also gaining a foothold in other European markets where VSB has operations.

With Europe increasingly shifting toward wind and solar power as part of its decarbonization efforts, including emerging solutions like offshore green hydrogen that complement wind buildouts, VSB’s track record of developing large-scale, sustainable energy projects provides TotalEnergies with a strong competitive edge. The acquisition will further TotalEnergies' position as a leader in the renewable energy space, especially in wind and solar power generation.

Financial and Market Implications

The US$1.65 billion deal marks TotalEnergies' largest renewable energy acquisition in recent years and underscores the growing importance of green energy investments within the company’s broader business strategy. TotalEnergies plans to use this acquisition to scale up its renewable energy assets and move closer to its target of achieving net-zero emissions by 2050. The deal also positions TotalEnergies to capitalize on the expected growth of renewable energy across Europe, particularly in countries with aggressive renewable energy targets and incentives.

The transaction is also expected to boost TotalEnergies’ presence in the global renewable energy market. As the world increasingly turns to wind, solar, and other sustainable energy sources, TotalEnergies is positioning itself to be a major player in the global energy transition. The acquisition of VSB complements TotalEnergies' previous investments in renewable energy and further aligns its portfolio with international sustainability trends.

From a financial standpoint, TotalEnergies’ purchase of VSB reflects the growing trend of large energy companies investing heavily in renewable energy. With wind and solar power becoming more economically competitive with fossil fuels, this investment is seen as a prudent long-term strategy, one that is likely to yield strong returns as demand for clean energy continues to rise.

Looking Ahead: TotalEnergies' Green Transition

TotalEnergies' acquisition of VSB is part of the company’s broader strategy to diversify its energy offerings and shift away from its traditional reliance on oil and gas. The company has already made significant strides in renewable energy, with investments in solar, wind, and battery storage projects across the globe, as developments like France's largest battery storage platform underline this momentum. The VSB acquisition will only accelerate these efforts, positioning TotalEnergies as one of the foremost leaders in the clean energy revolution.

By 2030, TotalEnergies plans to allocate more than 25% of its total capital expenditure to renewable energies and electricity. The company has already set ambitious goals to reduce its carbon footprint and shift its business model to align with the global drive toward sustainability. The integration of VSB into TotalEnergies’ portfolio signals a firm commitment to these goals, ensuring the company remains at the forefront of the energy transition.

In conclusion, TotalEnergies’ purchase of VSB for US$1.65 billion marks a significant milestone in the company’s renewable energy journey. By acquiring a company with deep expertise in wind and solar power development, TotalEnergies is taking decisive steps to strengthen its position in the renewable energy market and further its ambitions of achieving net-zero emissions by 2050. This acquisition will not only enhance the company’s growth prospects but also contribute to the ongoing global shift toward clean, sustainable energy sources.

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NRC Advanced Reactor Licensing streamlines a risk-informed, performance-based, technology-inclusive pathway for advanced non-light water reactors, aligning with NEIMA to enable predictable regulatory reviews, inherent safety, clean energy deployment, and industrial heat, hydrogen, and desalination applications.

Key Points

A risk-informed, performance-based NRC pathway streamlining licensing for advanced non-light water reactors.

✅ Aligned with NEIMA: risk-informed, performance-based, tech-inclusive

✅ Predictable licensing for advanced non-light water reactor designs

✅ Enables clean heat, hydrogen, desalination beyond electricity

The US Nuclear Regulatory Commission (NRC) voted 4-0 to approve the implementation of a more streamlined and predictable licensing pathway for advanced non-light water reactors, aligning with nuclear innovation priorities identified by industry advocates, the Nuclear Energy Institute (NEI) announced, and amid regional reliability measures such as New England emergency fuel stock plans that have drawn cost scrutiny.

This approach is consistent with the Nuclear Energy Innovation and Modernisation Act (NEIMA), a nuclear innovation act passed in 2019 by the US Congress calling for the development of a risk-informed, performance-based and technology inclusive licensing process for advanced reactor developers.

NEI Chief Nuclear Officer Doug True said: “A modernised regulatory framework is a key enabler of next-generation nuclear technologies that, amid ACORE’s challenge to DOE subsidy proposals in energy market proceedings, can help us meet our energy needs while protecting the climate. The Commission’s unanimous approval of a risk-informed and performance-based licensing framework paves the way for regulatory reviews to be aligned with the inherent safety characteristics, smaller reactor cores and simplified designs of advanced reactors.”

Over the last several years the industry’s Licensing Modernisation Project, sponsored by US Department of Energy, led by Southern Nuclear, and supported by NEI’s Advanced Reactor Regulatory Task Force, and influenced by a presidential order to bolster uranium and nuclear energy, developed the guidance for this new framework. Amid shifts in the fuel supply chain, including the U.S. ban on Russian uranium, this approach will inform the development of a new rule for licensing advanced reactors, which NEIMA requires.

“A well-defined licensing path will benefit the next generation of nuclear plants, especially as regions consider New England market overhaul efforts, which could meet a wide range of applications beyond generating electricity such as producing heat for industry, desalinating water, and making hydrogen – all without carbon emissions,” True noted.

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Maple Ridge Lithium-Ion Battery Plant will be a $1B E-One Moli clean-tech facility in Canada, manufacturing high-performance cells for tools and devices, with federal and provincial funding, creating 450 jobs and boosting battery supply chains.

Key Points

A $1B E-One Moli facility in B.C. producing lithium-ion cells, backed by federal and provincial funding.

✅ $204.5M federal and up to $80M B.C. support committed

✅ E-One Moli to create 450 skilled jobs in Maple Ridge

✅ High-performance cells for tools, medical devices, and equipment

A lithium-ion battery cell production plant costing more than $1 billion will be built in Maple Ridge, B.C., Prime Minister Justin Trudeau and Premier David Eby jointly announced on Tuesday.

Trudeau and Eby say the new E-One Moli facility will bolster Canada's role as a global leader in clean technology, as recent investments in Quebec's EV battery assembly illustrate today.

It will be the largest factory in Canada to manufacture such high-performance batteries, Trudeau said during the announcement, amid other developments such as a new plant in the Niagara Region supporting EV growth.

The B.C. government will contribute up to $80 million, while the federal government plans to contribute up to $204.5 million to the project. E-One Moli and private sources will supply the rest of the funding. 

Trudeau said B.C. has long been known for its innovation in the clean-technology sector, and securing the clean battery manufacturing project, alongside Northvolt's project near Montreal, will build on that expertise.

"The world is looking to Canada. When we support projects like E-One Moli's new facility in Maple Ridge, we bolster Canada's role as a global clean-tech leader, create good jobs and help keep our air clean," he said.

"This is the future we are building together, every single day. Climate policy is economic policy."

Nelson Chang, chairman of E-One Moli Energy, said the company has always been committed to innovation and creativity as creator of the world's first commercialized lithium-metal battery.

E-One Moli has been operating a plant in Maple Ridge since 1990. Its parent company, Taiwan Cement Corp., is based in Taiwan.

"We believe that human freedom is a chance for us to do good for others and appreciate life's fleeing nature, to leave a positive impact on the world," Chang said.

"We believe that [carbon dioxide] reduction is absolutely the key to success for all future businesses," he said.

The new plant will produce high-performance lithium-cell batteries found in numerous products, including vacuums, medical devices, and power and gardening tools, aligning with B.C.'s grid development and job plans already underway, and is expected to create 450 jobs, making E-One Moli the largest private-sector employer in Maple Ridge.

Eby said every industry needs to find ways to reduce their carbon footprint to ensure they have a prosperous future and every province should do the same, with resource plays like Alberta's lithium supporting the EV supply chain today.

It's the responsible thing to do given the record wildfires, extreme heat, and atmospheric rivers that caused catastrophic flooding in B.C., he said, with large-scale battery storage in southwestern Ontario helping grid reliability.

"We know that this is what we have to do. The people who suggest that we have to accept that as the future and stop taking action are simply wrong."

Trudeau, Eby and Chang toured the existing plant in Maple Ridge, east of Vancouver, before making the announcement.

The prime minister wove his way around several machines and apologized to technicians about the commotion his visit was creating.

The Canadian Taxpayers Federation criticized the federal and B.C. governments for the announcement, saying in a statement the multimillion-dollar handout to the battery firm will cost taxpayers hundreds of thousands of dollars for each job.

Federation director Franco Terrazzano said the Trudeau government has recently given "buckets of cash" to corporations such as Volkswagen, Stellantis, the Ford Motor Company and Northvolt.

"Instead of raising taxes on ordinary Canadians and handing out corporate welfare, governments should be cutting red tape and taxes to grow the economy," said Terrazzano. 

Construction is expected to start next June, as EV assembly deals put Canada in the race, and the company plans for the facility to be fully operational in 2028.

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Bitcoin Energy Consumption drives debate on blockchain mining, proof-of-work, carbon footprint, and emissions, with CCAF estimates in terawatt hours highlighting electricity demand, fossil fuel reliance, and sustainability concerns for data centers and cryptocurrency networks.

Key Points

Electricity used by Bitcoin proof-of-work mining, often fossil-fueled, estimated by CCAF in terawatt hours.

✅ CCAF: 40-445 TWh, central estimate ~130 TWh

✅ ~66% of mining electricity sourced from fossil fuels

✅ Proof-of-work increases hash rate, energy, and emissions

The University of Cambridge Centre for Alternative Finance (CCAF) studies the burgeoning business of cryptocurrencies.

It calculates that Bitcoin's total energy consumption is somewhere between 40 and 445 annualised terawatt hours (TWh), with a central estimate of about 130 terawatt hours.

The UK's electricity consumption is a little over 300 TWh a year, while Argentina uses around the same amount of power as the CCAF's best guess for Bitcoin, as countries like New Zealand's electricity future are debated to balance demand.

And the electricity the Bitcoin miners use overwhelmingly comes from polluting sources, with the U.S. grid not 100% renewable underscoring broader energy mix challenges worldwide.

The CCAF team surveys the people who manage the Bitcoin network around the world on their energy use and found that about two-thirds of it is from fossil fuels, and some regions are weighing curbs like Russia's proposed mining ban amid electricity deficits.

Huge computing power - and therefore energy use - is built into the way the blockchain technology that underpins the cryptocurrency has been designed.

It relies on a vast decentralised network of computers.

These are the so-called Bitcoin "miners" who enable new Bitcoins to be created, but also independently verify and record every transaction made in the currency.

In fact, the Bitcoins are the reward miners get for maintaining this record accurately.

It works like a lottery that runs every 10 minutes, explains Gina Pieters, an economics professor at the University of Chicago and a research fellow with the CCAF team.

Data processing centres around the world, including hotspots such as Iceland's mining strain, race to compile and submit this record of transactions in a way that is acceptable to the system.

They also have to guess a random number.

The first to submit the record and the correct number wins the prize - this becomes the next block in the blockchain.

Estimates for bitcoin's electricity consumption
At the moment, they are rewarded with six-and-a-quarter Bitcoins, valued at about $50,000 each.

As soon as one lottery is over, a new number is generated, and the whole process starts again.

The higher the price, says Prof Pieters, the more miners want to get into the game, and utilities like BC Hydro suspending new crypto connections highlight grid pressures.

"They want to get that revenue," she tells me, "and that's what's going to encourage them to introduce more and more powerful machines in order to guess this random number, and therefore you will see an increase in energy consumption," she says.

And there is another factor that drives Bitcoin's increasing energy consumption.

The software ensures it always takes 10 minutes for the puzzle to be solved, so if the number of miners is increasing, the puzzle gets harder and the more computing power needs to be thrown at it.

Bitcoin is therefore actually designed to encourage increased computing effort.

The idea is that the more computers that compete to maintain the blockchain, the safer it becomes, because anyone who might want to try and undermine the currency must control and operate at least as much computing power as the rest of the miners put together.

What this means is that, as Bitcoin gets more valuable, the computing effort expended on creating and maintaining it - and therefore the energy consumed - inevitably increases.

We can track how much effort miners are making to create the currency.

They are currently reckoned to be making 160 quintillion calculations every second - that's 160,000,000,000,000,000,000, in case you were wondering.

And this vast computational effort is the cryptocurrency's Achilles heel, says Alex de Vries, the founder of the Digiconomist website and an expert on Bitcoin.

All the millions of trillions of calculations it takes to keep the system running aren't really doing any useful work.

"They're computations that serve no other purpose," says de Vries, "they're just immediately discarded again. Right now we're using a whole lot of energy to produce those calculations, but also the majority of that is sourced from fossil energy, and clean energy's 'dirty secret' complicates substitution."

The vast effort it requires also makes Bitcoin inherently difficult to scale, he argues.

"If Bitcoin were to be adopted as a global reserve currency," he speculates, "the Bitcoin price will probably be in the millions, and those miners will have more money than the entire [US] Federal budget to spend on electricity."

"We'd have to double our global energy production," he says with a laugh, even as some argue cheap abundant electricity is getting closer to reality today. "For Bitcoin."

He says it also limits the number of transactions the system can process to about five per second.

This doesn't make for a useful currency, he argues.

Rising price of bitcoin graphic
And that view is echoed by many eminent figures in finance and economics.

The two essential features of a successful currency are that it is an effective form of exchange and a stable store of value, says Ken Rogoff, a professor of economics at Harvard University in Cambridge, Massachusetts, and a former chief economist at the International Monetary Fund (IMF).

He says Bitcoin is neither.

"The fact is, it's not really used much in the legal economy now. Yes, one rich person sells it to another, but that's not a final use. And without that it really doesn't have a long-term future."

What he is saying is that Bitcoin exists almost exclusively as a vehicle for speculation.

So, I want to know: is the bubble about to burst?

"That's my guess," says Prof Rogoff and pauses.

"But I really couldn't tell you when."

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