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Only two decades ago, some scientists were skeptical we could integrate more than about 20% renewable energy generation on the U.S. power grid. But we hit that milestone in 2020 — so, these days, experts’ sights are set on finding pathways toward a fully renewable national power system. And according to new research published in Joule, the nation could get a long way toward 100% cost-effectively; it is only the final few percent of renewable generation that cause a nonlinear spike in costs to build and operate the power system.

In “Quantifying the Challenge of Reaching a 100% Renewable Energy Power System for the United States,” analysts from the U.S. Department of Energy’s (DOE’s) National Renewable Energy Laboratory (NREL) and DOE’s Office of Energy Efficiency and Renewable Energy (EERE) evaluate possible pathways and quantify the system costs of transitioning to a 100% renewable power grid for the contiguous United States. The research was funded by EERE’s Strategic Analysis Team.

“Our goal was to robustly quantify the cost of a transition to a high-renewable power system in a way that provides electric-sector decision-makers with the information they need to assess the cost and value of pursuing such systems,” said Wesley Cole, NREL senior energy analyst and lead author of the paper.

Expanding on previous work to simulate the evolution of the U.S. power system at unprecedented scale, the authors quantify how various assumptions about how the power system might evolve can impact future system costs. They show how costs can increase nonlinearly for the last few percent toward 100%, which could drive interest in non-electric-sector investments that accomplish similar decarbonization objectives with a lower total tab.

“Our results highlight that getting all the way to 100% renewables is really challenging in terms of costs, but because the challenge is nonlinear, getting close to 100% is much easier,” Cole said. “We also show how innovations such as lower technology costs, or alternate definitions for 100% clean energy such as including nuclear or carbon capture, can lower the cost of reaching the target.”

Advanced Methods Expand Our Understanding of High-Renewable Grids

This work builds on another Joule article released last month exploring the key unresolved technical and economic challenges in achieving a 100% renewable U.S. electricity system. While some aspects of 100% renewable power grids are well established, there is much we do not know. And because 100% renewable grids do not exist at the scale of the entire United States, we rely on models to evaluate and understand possible future systems.

“With increasing reliance on energy storage technologies and variable wind and solar generation, modeling 100% renewable power systems is incredibly complex,” said Paul Denholm, NREL principal energy analyst and coauthor of the paper. “How storage was used yesterday impacts how it can be used today, and while the resolution of our renewable resource data has improved tremendously in recent years, we can’t precisely predict cloudy weather or calm winds.”

Integrated energy pathways modernizes our grid to support a broad selection of generation types, encourages consumer participation, and expands our options for transportation electrification.

Many prior studies have modeled high-renewable electricity systems for a variety of geographies, but not many examine the entire U.S. grid. And even fewer studies attempt to calculate the cost of transitioning to a 100% renewable U.S. grid — instead, they typically present snapshots of systems in a future year without considering the evolution needed to get there. This work expands on these prior studies with several important advances.

First, the team used detailed production cost modeling with unit commitment and economic dispatch to verify the results of the capacity expansion modeling performed with NREL’s publicly available Regional Energy Deployment System (ReEDS) model. The production cost model is Energy Exemplar’s PLEXOS, a commercial model widely used in the utility industry.

“Over the past couple of years we put a tremendous amount of effort into our modeling tools to give us confidence in their ability to capture the challenges inherent in 100% renewable energy power systems,” Cole said. “In addition, we also tried to consider a broad range of future conditions and definitions of the 100% requirement. The combination of these efforts enables us to quantify the cost of a transition to a 100% clean energy system far better than we could in the past.”

The analysis represents the power system with higher spatial and technology resolution than previous studies in order to better capture differences in technology types, renewable energy resource profiles, siting and land-use constraints, and transmission challenges. The analysis also uniquely captures the ability to retrofit existing fossil plants to serve needs under 100% renewable scenarios and assesses whether inertial response can be maintained in these futures.

What Drives System Costs? Transition Speed, Capital Costs, and How We Define 100%

The team simulated a total of 154 different scenarios for achieving up to 100% renewable electricity to determine how the resulting system cost changes under a wide range of future conditions, timeframes, and definitions for 100% — including with systems that allow nonrenewable low-carbon technologies to participate.

“Here we use total cumulative system cost as the primary metric for assessing the challenge of increased renewable deployment for the contiguous U.S. power system,” said Trieu Mai, NREL senior energy analyst and coauthor of the paper. “This system cost is the sum of the cost of building and operating the bulk power system assets out to the year 2050, after accounting for the time value of money.”

To establish a reference case for comparison, the team modeled the system cost at increasing renewable energy deployment for base conditions, which use midrange projections for factors such as capital costs, fuel prices, and electricity demand growth. Under these conditions, the least-cost buildout grows renewable energy from 20% of generation today to 57% in 2050, with average levelized costs of $30 per megawatt-hour (MWh). Imposing a requirement to achieve 100% renewable generation by 2050 under these same conditions raises these costs by 29%, or less than $10 per MWh. System costs increase nonlinearly for the last few percent approaching 100%

Associated with the high renewable energy targets are substantial reductions in direct carbon dioxide (CO2) emissions. From the 57% least-cost scenario, the team translated the changes in system cost and CO2 emissions between scenarios into an average and incremental levelized CO2 abatement cost. The average value is the abatement cost relative to the 57% scenario, while the incremental value is the abatement cost between adjacent scenarios, e.g., between 80% and 90% renewables. In other words, the average value considers all the changes, while the incremental value considers only the change over the most recent increment.

Total bulk power system cost at a 5% discount rate (left) for the seven base scenarios and levelized average and incremental CO2 abatement cost (right) for those scenarios. The 2050 renewable (RE) generation level for each scenario is listed on the x-axis. The system costs in the left figure are subdivided into the four cost categories listed in the figure legend (O&M = operations and maintenance). The purple diamond on the y-axis in the left plot indicates the system cost for maintaining the current generation mix, which can be used to compare costs and indicates a system cost comparable to the 90% case.

Total bulk power system cost at a 5% discount rate (left) for the seven base scenarios and levelized average and incremental CO2 abatement cost (right) for those scenarios. The 2050 renewable (RE) generation level for each scenario is listed on the x-axis. The system costs in the left figure are subdivided into the four cost categories listed in the figure legend (O&M = operations and maintenance). The purple diamond on the y-axis in the left plot indicates the system cost for maintaining the current generation mix, which can be used to compare costs and indicates a system cost comparable to the 90% case. NREL

Notably, incremental abatement costs from 99% to 100% reach $930/ton, driven primarily by the need for firm renewable capacity — resources that can provide energy during periods of lower wind and solar generation, extremely high demand, and unplanned events like transmission line outages. In many scenarios, this firm capacity was supplied by renewable-energy-fueled combustion turbines, which could run on biodiesel, synthetic methane, hydrogen, or some other renewable energy resource to support reliable power system operation. The DOE Energy Earthshots Initiative recently announced by Secretary of Energy Jennifer M. Granholm includes the Hydrogen Shot, which seeks to reduce the cost of clean hydrogen by 80% to $1 per kilogram in one decade — an ambitious effort that could help reduce the cost of providing renewable firm capacity.

“When achieving a 100% renewable system, the costs are significantly lower if there is a cost-effective source of firm capacity that can qualify for the 100% definition,” Denholm said. “The last few percent cannot cost-effectively be satisfied using only wind, solar, and diurnal storage or load flexibility — so other resources that can bridge this gap become particularly important.”

Capital costs are the largest contributor to system costs at 100% renewable energy. Future changes in the capital costs of renewable technologies and storage can thus greatly impact the total system cost of 100% renewable grids. The speed of transition is also an important consideration for both cost and emission impacts. The scenarios with more rapid transitions to 100% renewable power were more costly but had greater cumulative emissions reductions.

“Looking at the low incremental system costs in scenarios that increase renewable generation levels somewhat beyond the reference solutions to 80%–90%, we see considerable low-cost abatement opportunities within the power sector,” Mai said. “The trade-off between power-sector emissions reductions and the associated costs of reducing those emissions should be considered in the context of non-power-sector opportunities to reduce emissions, which might have lower abatement costs — especially at the higher renewable generation levels.”

“The way the requirement is defined is an important aspect of understanding the costs of the requirement and associated emissions reduction,” Cole said. “For instance, if the 100% requirement is defined as a fraction of electricity sales, as it is with current state renewable polices, the cost and emissions of meeting that requirement are similar to those of the scenarios that have requirements of less than 100%.”

Additional Research Can Help the Power Sector Understand the Path Forward

While this work relies on state-of-the-art modeling capabilities, additional research is needed to help fill gaps in our understanding of the technical solutions that could be implemented to achieve higher levels of renewable generation, and their impact on system cost. Future work could focus on key considerations such as the scaling up supply chains, social or environmental factors that could impact real-world deployment, the future role of distributed energy resources, or how increased levels of demand flexibility could reduce costs, to name a few.

“While there is much left to explore, given the energy community’s frequent focus on using the electricity sector as the foundation for economy-wide decarbonization, we believe this work extends our collective understanding of what it might take to get to 100%,” Cole said.

Learn more about NREL’s energy analysis and grid modernization research.

Article courtesy of the NREL, the U.S. Department of Energy


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Tesla Semi suffers more delays and ‘dramatic’ price increase

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Tesla Semi suffers more delays and 'dramatic' price increase

According to a Tesla Semi customer, the electric truck program is suffering more delays and a price increase that is described as “dramatic.”

Tesla Semi has seen many delays, more than any other vehicle program at Tesla.

It was initially unveiled in 2017, and CEO Elon Musk claimed that it would go into production in 2019.

In late 2022, Tesla held an event where it unveiled the “production version” of the Tesla Semi and delivered the first few units to a “customer-partner”: PepsiCo.

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Tesla Semi PepsiCo truck u/Tutrifor
Tesla Semi Image credit: u/Tutrifor

More than 3 years later, the vehicle never went into volume production. Instead, Tesla only ran a very low volume pilot production at a factory in Nevada and only delivered a few dozen trucks to customers as part of test programs.

But Tesla promised that things would finally happen for the Tesla Semi this year.

Tesla has been building a new high-volume production factory specifically for the Tesla Semi program in a new building next to Gigafactory Nevada.

The goal was to start production in 2025, start customer deliveries, and ramp up to 50,000 trucks yearly.

Now, Ryder, a large transportation company and early customer-partner in Tesla’s semi truck program, is talking about further delays. The company also refers to a significant price increase.

California’s Mobile Source Air Pollution Reduction Review Committee (MSRC) awarded Ryder funding for a project to deploy Tesla Semi trucks and Megachargers at two of its facilities in the state.

Ryder had previously asked for extensions amid the delays in the Tesla Semi program.

In a new letter sent to MSRC last week and obtained by Electrek, Ryder asked the agency for another 28-month delay. The letter references delays in “Tesla product design, vehicle production” and it mentions “dramatic changes to the Tesla product economics”:

This extension is needed due to delays in Tesla product design, vehicle production and dramatic changes to the Tesla product economics. These delays have caused us to reevaluate the current Ryder fleet in the area.

The logistics company now says it plans to “deploy 18 Tesla Semi vehicles by June 2026.”

The reference to “dramatic changes to the Tesla product economics” points to a significant price increase for the Tesla Semi, which further communication with MSRC confirms.

In the agenda of a meeting to discuss the extension and changes to the project yesterday, MSRC confirms that the project went from 42 to 18 Tesla Semi trucks while the project commitment is not changing:

Ryder has indicated that their electric tractor manufacturer partner, Tesla, has experienced continued delays in product design and production. There have also been dramatic changes to the product economics. Ryder requests to reduce the number of vehicles from 42 to 18, stating that this would maintain their $7.5 million private match commitment.

In addition to the electric trucks, the project originally involved installing two integrated power centers and four Tesla Megachargers, split between two locations. Ryder is also looking to now install 3 Megachargers per location for a total of 6 instead of 4.

Tesla Semi Megacharger hero

The project changes also mention that “Ryder states that Tesla now requires 600kW chargers rather than the 750kW units originally engineered.”

Tesla Semi Price

When originally unveiling the Tesla Semi in 2017, the automaker mentioned prices of $150,000 for a 300-mile range truck and $180,000 for the 500-mile version. Tesla also took orders for a “Founder’s Series Semi” at $200,000.

However, Tesla didn’t update the prices when launching the “production version” of the truck in late 2023. Price increases have been speculated, but the company has never confirmed them.

New diesel-powered Class 8 semi trucks in the US today often range between $150,000 and $220,000.

The combination of a reasonable purchase price and low operation costs, thanks to cheaper electric rates than diesel, made the Tesla Semi a potentially revolutionary product to reduce the overall costs of operation in trucking while reducing emissions.

However, Ryder now points to a “dramatic” price increase for the Tesla Semi.

What is the cost of a Tesla Semi electric truck now?

Electrek’s Take

As I have often stated, Tesla Semi is the vehicle program I am most excited about at Tesla right now.

If Tesla can produce class 8 trucks capable of moving cargo of similar weight as diesel trucks over 500 miles on a single charge in high volume at a reasonable price point, they have a revolutionary product on their hands.

But the reasonable price part is now being questioned.

After reading the communications between Ryder and MSRC, while not clear, it looks like the program could be interpreted as MSRC covering the costs of installing the charging stations while Ryder committed $7.5 million to buying the trucks.

The math makes sense for the original funding request since $7.5 million divided by 42 trucks results in around $180,000 per truck — what Tesla first quoted for the 500-mile Tesla Semi truck.

Now, with just 18 trucks, it would point to a price of $415,000 per Tesla Semi truck. It’s possible that some of Ryder’s commitment could also go to an increase in Megacharger prices – either per charger or due to the two additional chargers. MSRC said that they don’t give more money when prices go up after an extension.

I wouldn’t be surprised if the 500-mile Tesla Semi ends up costing $350,000 to $400,000.

If that’s the case, Tesla Semi is impressive, but it won’t be the revolutionary product that will change the trucking industry.

It will need to be closer to $250,000-$300,000 to have a significant impact, which is not impossible with higher-volume production but would be difficult.

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BP chair Helge Lund to step down after oil major pledges strategic reset

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BP chair Helge Lund to step down after oil major pledges strategic reset

British oil and gasoline company BP (British Petroleum) signage is being pictured in Warsaw, Poland, on July 29, 2024.

Nurphoto | Nurphoto | Getty Images

British oil major BP on Friday said its chair Helge Lund will soon step down, kickstarting a succession process shortly after the company launched a fundamental strategic reset.

“Having fundamentally reset our strategy, bp’s focus now is on delivering the strategy at pace, improving performance and growing shareholder value,” Lund said in a statement.

“Now is the right time to start the process to find my successor and enable an orderly and seamless handover,” he added.

Lund is expected to step down in 2026. BP said the succession process will be led by Amanda Blanc in her capacity as senior independent director.

Shares of BP traded 2.2% lower on Friday morning. The London-listed firm has lagged its industry rivals in recent years.

BP announced in February that it plans to ramp up annual oil and gas investment to $10 billion through 2027 and slash spending on renewables as part of its new strategic direction.

Analysts have broadly welcomed BP’s renewed focus on hydrocarbons, although the beleaguered energy giant remains under significant pressure from activist investors.

U.S. hedge fund Elliott Management has built a stake of around 5% to become one of BP’s largest shareholders, according to Reuters.

Activist investor Follow This, meanwhile, recently pushed for investors to vote against Lund’s reappointment as chair at BP’s April 17 shareholder meeting in protest over the firm’s recent strategy U-turn.

Lund had previously backed BP’s 2020 strategy, when Bernard Looney was CEO, to boost investment in renewables and cut production of oil and gas by 40% by 2030.

BP CEO Murray Auchincloss, who took the helm on a permanent basis in January last year, is under significant pressure to reassure investors that the company is on the right track to improve its financial performance.

‘A more clearly defined break’

“Elliott continues to press BP for a sharper, more clearly defined break with the strategy to pivot more quickly toward renewables, that was outlined by Bernard Looney when he was CEO,” Russ Mould, AJ Bell’s investment director, told CNBC via email on Friday.

“Mr Lund was chair then and so he is firmly associated with that plan, which current boss Murray Auchincloss is refining,” he added.

Mould said activist campaigns tend to have “fairly classic thrusts,” such as a change in management or governance, higher shareholder distributions, an overhaul of corporate structure and operational improvements.

“In BP’s case, we now have a shift in capital allocation and a change in management, so it will be interesting to see if this appeases Elliott, though it would be no surprise if it feels more can and should be done,” Mould said.

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Quick Charge | hydrogen hype falls flat amid very public failures

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Quick Charge | hydrogen hype falls flat amid very public failures

On today’s hyped up hydrogen episode of Quick Charge, we look at some of the fuel’s recent failures and billion dollar bungles as the fuel cell crowd continues to lose the credibility race against a rapidly evolving battery electric market.

We’re taking a look at some of the recent hydrogen failures of 2025 – including nine-figure product cancellations in the US and Korea, a series of simultaneous bus failures in Poland, and European executives, experts, and economists calling for EU governments to ditch hydrogen and focus on the deployment of a more widespread electric trucking infrastructure.

Prefer listening to your podcasts? Audio-only versions of Quick Charge are now available on Apple PodcastsSpotifyTuneIn, and our RSS feed for Overcast and other podcast players.

New episodes of Quick Charge are recorded, usually, Monday through Thursday (and sometimes Sunday). We’ll be posting bonus audio content from time to time as well, so be sure to follow and subscribe so you don’t miss a minute of Electrek’s high-voltage daily news.

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Drop us a line at tips@electrek.co. You can also rate us on Apple Podcasts and Spotify, or recommend us in Overcast to help more people discover the show.

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