Episode 134 – Dr. Alexander “Sandy” MacDonald
The U.S. SuperGrid: Powering America’s Clean Energy Future Featuring Dr. Alexander “Sandy” MacDonald on The Covert Code Podcast with Anna Covert
We spend a lot of time talking about the future of technology. Artificial intelligence, electric vehicles, automation, and the next generation of connected devices are changing how we live and work. But there is something underneath all of these innovations that doesn’t always get the attention it deserves: electricity.
Our electrical infrastructure was developed for a very different economy. As demand changes and renewable generation expands, the question is no longer simply how much electricity we can produce. It is also how we move that electricity from where it is generated to where people and businesses need it.
My guest this week on The Covert Code Podcast is Dr. Alexander “Sandy” MacDonald, an award-winning atmospheric scientist, former director of NOAA’s Earth System Research Laboratory, and CEO of American SuperGrid, LLC.
Sandy has spent decades studying weather, climate, and the complex systems that influence our planet. Today, he is applying that experience to an ambitious vision for America’s electrical infrastructure: an underground, nationwide High Voltage Direct Current SuperGrid.
Our conversation explores how the proposed system could work, why Sandy believes a national electricity market matters, and what it could mean for renewable energy, businesses, and the resilience of our communities.
From Weather Forecasting to America’s Energy Future
Sandy’s interest in science began during his childhood on the high plains of Montana, where he developed a fascination with thunderstorms and weather. He went on to earn his PhD from the University of Utah and began a career in meteorology that included more than four decades of federal service.
His work at NOAA involved weather forecasting, radar and satellite systems, advanced computer modeling, and eventually the broader study of climate.
That combination of meteorology, computing, and climate science became central to his later energy research. Weather determines when and where wind and solar electricity can be produced. Understanding weather patterns across an entire continent is therefore essential when designing an electricity system that relies heavily on renewable generation.
Science On a Sphere: Helping People See the Planet Differently
Before discussing the SuperGrid, Sandy shares the story behind one of his inventions: NOAA’s Science On a Sphere.
The idea began with a simple experiment using a beach ball and video projectors. Sandy wanted to find a way for people to see weather and climate as truly global systems rather than disconnected images on flat maps.
That early experiment eventually developed into an educational visualization system displaying planetary data on a large animated globe. Today, Science On a Sphere is used in museums, science centers, and educational institutions to help visitors understand atmospheric storms, ocean temperatures, climate, and other Earth systems.
It’s a fascinating example of how visualization can make complicated scientific information easier to understand. And it connects directly to Sandy’s approach to energy: to solve a large-scale problem, we first need to understand how the entire system works.
What Is the U.S. SuperGrid?
Imagine an Interstate Highway System, but instead of moving vehicles and goods across the country, it moves electricity.
That is how Sandy describes the basic concept behind the U.S. SuperGrid.
His proposal involves building a nationwide network of underground High Voltage Direct Current, or HVDC, transmission lines. The system would form a mesh across the continental United States, allowing electricity to move between distant regions through multiple interconnected routes.
Importantly, this would not require eliminating the existing alternating current grid. Sandy describes a hybrid system in which the HVDC SuperGrid handles large-scale, long-distance electricity transmission while existing AC infrastructure continues to deliver electricity to regional utilities, businesses, and homes.
The concept is based in part on research Sandy and his colleagues published in Nature Climate Change in 2016, examining how a national transmission network could support much greater use of wind and solar electricity.
Learn more about the proposal through the North American Supergrid initiative.
Why Geography Matters for Renewable Energy
One of the most interesting parts of our conversation is Sandy’s explanation of the relationship between geography and electricity demand.
America’s population and major commercial centers are concentrated in certain regions, but some of the country’s greatest wind and solar resources are located elsewhere.
The Great Plains, for example, offer significant renewable energy potential. Yet producing electricity in a region with abundant wind or sunshine doesn’t automatically mean it can be delivered economically to distant cities.
That is where transmission becomes critical.
Sandy explains that a nationwide network could connect geographically diverse renewable resources. When wind generation is strong in one part of the country and solar generation is strong in another, electricity could move across the network to help meet demand elsewhere.
His research uses detailed weather information to examine how those differences can complement one another across a much larger geographic area.
Creating a National Electricity Market
Beyond the engineering, Sandy sees a substantial economic opportunity in a national electricity market.
He compares electricity to other products that can be manufactured in one state and sold throughout the country using transportation infrastructure.
Electricity, however, is constrained by the capacity and structure of the transmission network.
A national HVDC system could potentially allow a wind developer in the Great Plains, a solar producer in the Southwest, or another electricity generator to reach customers across a much wider market.
That could change how energy projects are developed and how different regions participate in the electricity economy.
It also raises interesting questions about the future of utilities, independent energy producers, and distributed generation.
What Happens to Existing Utilities?
One of my questions for Sandy was what a national SuperGrid would mean for existing utility companies.
His answer is that the current system would still have an important role.
He compares the relationship to interstate highways and local roads. The interstate system makes long-distance transportation possible, but local streets remain essential for reaching individual destinations.
In the same way, a national HVDC network could provide long-distance transmission while existing regional and local infrastructure continues to serve individual communities.
Utilities would still need to maintain and upgrade their networks, and new converter stations would connect the two systems.
Why Build the SuperGrid Underground?
Putting a major transmission network underground is a central part of Sandy’s proposal.
He discusses the possibility of using existing interstate highway rights-of-way to create underground transmission corridors. This could reduce the need for additional overhead towers along some routes and potentially help address certain land-use concerns.
But Sandy’s interest in underground infrastructure goes beyond aesthetics.
As a meteorologist, he has spent his career studying the kinds of weather events that can damage exposed infrastructure. Hurricanes, ice storms, tornadoes, and other severe weather can interrupt electricity service, sometimes for extended periods.
Underground transmission would not eliminate every risk, but Sandy argues that a more interconnected, protected network could improve the resilience of the broader system.
Grid Resilience Is About More Than Keeping the Lights On
Electricity is fundamental to nearly every part of modern life.
When power is interrupted, the consequences can extend well beyond lighting and air conditioning. Water systems, transportation, communications, healthcare, and food distribution all depend on reliable electricity.
During our conversation, Sandy discusses major historical outages, including the 2021 Texas winter storm, as examples of the consequences of infrastructure failures.
His proposal is not simply to build additional transmission capacity. He wants to examine how the entire electrical system could be made more resilient through interconnected routes, protected infrastructure, backup equipment, and upgrades to existing networks.
Artificial Intelligence Adds Another Dimension
We also discuss artificial intelligence and its relationship to electricity infrastructure.
AI offers significant opportunities for science, forecasting, productivity, and technological development. At the same time, it creates new demands on the infrastructure supporting data centers and advanced computing.
Sandy raises another concern: as society becomes increasingly dependent on digital systems, protecting critical infrastructure against cyber threats and other disruptions becomes more important.
For him, the future energy system needs to be designed with both capacity and security in mind.
Preparing for Extreme Weather and Solar Storms
One of the most thought-provoking parts of our conversation concerns risks that many people rarely consider.
In addition to hurricanes and severe winter weather, Sandy discusses geomagnetic storms caused by solar activity.
He references the Carrington Event of 1859 and explains why large solar disturbances deserve consideration when planning critical electrical infrastructure.
Importantly, he acknowledges that putting transmission lines underground would not, by itself, protect the entire system from every electromagnetic disturbance.
Resilience requires a more comprehensive approach, including appropriately protected equipment, backup transformers, and upgrades across both new and existing infrastructure.
Can the U.S. Make the Transition?
Developing a nationwide SuperGrid would involve far more than engineering.
Land access, permitting, financing, utility coordination, regulatory decisions, and the practical challenges of building infrastructure across multiple states would all need to be addressed.
Sandy believes the technical foundations already exist. His broader argument is that large-scale transmission infrastructure deserves serious consideration alongside new electricity generation.
He also discusses the potential role of other technologies, including energy storage, nuclear energy, and geothermal power, within a changing electricity system.
The Opportunity to Build for Future Generations
One of the themes I appreciated most about our conversation was Sandy’s perspective on long-term thinking.
Previous generations built the transportation and energy systems that made modern economic development possible. The infrastructure decisions being considered today will likewise influence the opportunities available to future generations.
Whether a nationwide SuperGrid is built exactly as Sandy envisions or through a different combination of transmission technologies, the questions he raises are important.
How do we move electricity more effectively? How do we connect renewable resources with demand? How do we strengthen infrastructure against severe weather and other disruptions? And how do we prepare for a future in which electricity supports an even greater share of economic activity?
These are questions that extend far beyond the energy industry.
Watch my full conversation with Dr. Alexander “Sandy” MacDonald on The Covert Code Podcast.
Additional Resources
The U.S. SuperGrid: Powering America’s Clean Energy Future
The Covert Code Podcast | Episode 134
Host: Anna Covert
Guest: Dr. Alexander “Sandy” MacDonald
Transcript edited lightly for readability. Obvious transcription errors in names and technical terminology have been corrected. Statements and estimates are those of the speakers.
Full Episode Transcript
Anna Covert [00:00:00]:
Aloha. My name is Anna Covert, and I'm coming to you from my battleship here on the beautiful island of Oahu.
This week on The Covert Code, the topic is the U.S. SuperGrid: Powering America's Clean Energy Future.
My very special guest is Dr. Alexander “Sandy” MacDonald, an award-winning atmospheric scientist, former director of NOAA's Earth System Research Laboratory, and CEO of American SuperGrid, LLC.
After 40 years of federal service, Sandy turned his attention to helping address one of America's most urgent needs: transforming our aging electrical grid into a modern, nationwide energy network.
For the last 15 years, he has championed the concept of a SuperGrid capable of delivering clean power nationwide, increasing energy security, improving reliability and helping the concept of net zero become a real possibility.
Today, we'll be discussing not only how America's future depends on how we create power, but also how we deliver it effectively and efficiently from the places where it's being generated to the people and communities who need it most.
Thank you so much for being here today, Sandy.
Dr. Alexander “Sandy” MacDonald [00:01:13]:
Okay. Well, thank you for having me on.
Anna Covert [00:01:16]:
So, to begin, you're a fascinating man. Will you give us a little CliffsNotes version of your story before we dive into the SuperGrid?
Dr. Alexander “Sandy” MacDonald [00:01:26]:
Okay, well, I was one of those kids who was on the high Montana plains, loving weather and watching thunderstorms. I got really excited about weather when I was a child.
I got into my dream job, which was being in the field of meteorology. I got my PhD from the University of Utah and joined the National Weather Service. I spent probably about seven years working for the National Weather Service.
Then I got into the research part of NOAA. Again, my interest was always making weather forecasts better. We worked to build some of the best radar and satellite information systems.
I got interested in modeling, forecasting and the computers needed to do it.
Later in my career, I became head of all of the laboratories and cooperative institutes as the deputy for laboratories. That got me into climate.
The big thing I got out of getting into climate was that we're in trouble. We don't have much time. We can't just transform the United States. We have to transform the whole world.
So I did a seven-year study to ask: How could we build a system that would solve the climate crisis?
I think we found out how that is, and that's what I'm going to talk about.
NOAA's Science On a Sphere
Anna Covert [00:03:05]:
Wow. Tell me a little bit about one of your projects. I know you took one of your science projects on tour, and students were learning about it. Can you share a little bit about your Earth project?
Dr. Alexander “Sandy” MacDonald [00:03:17]:
Okay. Somewhere along the line, I got interested in how we show the world what's happening with both weather and climate.
Weather is global, and climate is global.
There was a time when I was working for Vice President Gore, and we talked a little bit about how people could understand climate. We both agreed that you've got to be able to show it really nicely.
One day, I set up a beach ball in my garage. This was in the early '90s. I put up some video projectors, and it looked pretty nice. You could see the weather moving on the beach ball and so on.
I was head of a laboratory where we needed to display climate and weather forecasts.
Working with my lab and with good support from NOAA, we built NOAA's Science On a Sphere, which is a six-foot sphere.
It's in approximately 300 museums worldwide. It's teaching people about weather and climate, and it's been seen by over 1.1 billion people since my invention.
I invented it, and I never got anything for it other than the idea that people are learning about weather and climate over the whole globe.
Anna Covert [00:04:39]:
Wow, that is amazing. And you used it with—and that's also one of the key ways we're predicting what could happen. Is that the case?
Dr. Alexander “Sandy” MacDonald [00:04:48]:
Yeah. I think weather and climate are truly global.
You have air over you that was in China only about three days before, in Hawaii, and another day and it's over the mainland.
What we have to realize is that we have to think of weather and climate, the solutions, the understanding and the forecasts as a truly global part of our science.
A Global Energy Revolution
Anna Covert [00:05:22]:
So really, you're talking about a global energy revolution.
Tell us, what do you think this energy revolution is going to be, and why? How are we going to make it happen?
Dr. Alexander “Sandy” MacDonald [00:05:33]:
Okay, so we have a big problem.
The amount of carbon dioxide going into the air is now about 40 billion tons, and we can't keep doing that.
The thing I say about it is that the Industrial Revolution built the world we have, and it's a great world. We've made great advances. That was the right thing. We used coal and ultimately oil and natural gas.
However, now we have a great opportunity to have a much better system. It's already available. Almost nobody understands it.
That's why I put effort, starting in 2005, into asking whether we could build a net-zero, decarbonized society and have it cost less, be more reliable and be better—and not just work in rich countries.
A lot of people say, well, let's build all these nuclear plants. But if we were going to build enough nuclear plants for Africa by 2050, that's 12,000 nuclear plants.
I'm kind of in favor of nuclear, and I think there are some exciting things happening, like small modular reactors.
But we're really out of time, and we do have something that works.
Right now, we're about 80% fossil fuels in the U.S., and close to that globally. We need to flip that so that we're 80% wind and solar by 2050.
If nuclear can come along faster, I'm all for it. If some of these new fusion ideas work, I'm all for it.
The big thing is that we can't keep putting 40 billion tons of carbon dioxide into the air for much longer.
Anna Covert [00:07:31]:
Do you think we even have until 2050?
Dr. Alexander “Sandy” MacDonald [00:07:35]:
I think we do.
I did a lot of research over the last 20 years on how you could flip the global economy, and it's really hard.
Somebody said it's like trying to turn an aircraft carrier around on a dime. You can't turn it fast enough.
The estimate I came up with is that the very fastest we could flip the global economy—not just the U.S., not just China, but all the countries, including countries that are just coming into technological advancement in Africa and South America—is about 40 years.
We need to be able to flip all of them, stop using fossil fuels and build this new economy mainly based on wind and solar.
Going from 80% fossil fuels to 80% wind and solar by the 2060s is what I feel will work.
Forty years to turn this big energy economy around.
My background is really more in climate science. What I love is that if we could do that, starting now—and we have to start soon—if we can do that by the 2060s, we're really going to save our planet for thousands of years into the future.
The converse is what's scary. If we can't do it, our children and a thousand generations are going to live on a really hot and hostile planet unless we act now.
Anna Covert [00:09:17]:
Yeah, I think it's really that we get to do it. It's our opportunity and our privilege.
Here in Hawaii, we call it kuleana. It's our responsibility and our honor to be able to do this.
Instead of saying that we have to do it, if we can all start to say that we get to be the ones to do this and how special that is, I think that changes the conversation.
