Leak forces Palo Verde to shut one reactor

By The Arizona Republic


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The Palo Verde Nuclear Generating Station shut down one of its three reactors because of a cooling-water leak, officials said.

The leak in Unit 2 is not radioactive and not a threat to the public, said a spokeswoman for the plant, which is 50 miles west of downtown Phoenix.

That brings the plant, a crucial source of electricity for the valley, down to one operating reactor.

Unit 3 is undergoing a scheduled refueling and steam-generator repair that is expected to keep it off-line for 75 days.

Unit 2's cooling-water leak should be repaired quickly and the reactor could be at full power very soon, said Betty Dayyo, an Arizona Public Service Co. spokeswoman. The utility operates the facility for several owners.

Unexpected outages can affect the price Arizonans pay for electricity because they force utilities to buy or generate more-expensive energy to replace the relatively cheap energy generated at Palo Verde.

APS can turn up some of its natural-gas-fired power plants in the region that are not running at capacity to make sure Arizonans have enough electricity, Dayyo said.

"We're looking at the costs between our own units and what the market (price for electricity) is," Dayyo said.

A Salt River Project spokesman said that it likely will cost the utility and its customers more to replace power that utility normally gets from Palo Verde but that it is difficult to determine how much this early in the outage.

"Our resources are plenty to meet customer demand," SRP spokesman Scott Harelson said.

Most of the Valley is served by APS or SRP.

Separately, an independent audit of reactor problems in 2005 and 2006 at Palo Verde's Unit 1 caused by a vibrating cooling pipe found that APS' actions were "reasonable and prudent" in handling that expensive problem.

GDS Associates Inc. of Georgia reviewed the problem and determined that it could not have been anticipated and that repairs were made "in a reasonable amount of time."

It cost APS $79 million to replace the power lost during that episode, and it has been collecting the increase from ratepayers.

If the GDS report showed the utility acted irresponsibly, regulators might have been more likely to ask the utility to refund the money.

GDS has previously determined that some earlier outages at the plant were the utility's fault, and it recommended against allowing APS to collect higher energy costs.

"APS believes that all replacement power costs (from the vibrating-pipe outage) were prudently incurred and that... (the money) will not have to be refunded," APS spokesman Alan Bunnell said.

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Alberta's electricity rebate program extended until December

Alberta Electricity Rebate Extension provides $50 monthly credits, utility bill relief, and an natural gas rebate, supporting homes, farms, and small businesses with energy costs through December 2022, capped at 250 MWh per year.

 

Key Points

A provincial program extending $50 credits and energy relief, with a natural gas rebate for eligible consumers in 2022.

✅ Up to $300 in bill credits; auto-applied to eligible accounts

✅ Applies to whole bill; limit 250 MWh/year consumption

✅ Natural gas rebate triggers above $6.50/GJ Oct-Mar 2023

 

Alberta's electricity rebate program has been extended by three months amid an electricity price spike in Alberta, and will now be in effect until the end of December, the government said.

The program was originally to provide more than 1.9 million homes, farms and small businesses with $50 monthly credits on their electricity bills, complementing a consumer price cap on power bills, for July, August and September. It will now also cover the final three months of 2022.

Those eligible for the rebate could receive up to $300 in credits until the end of December, a relief for Alberta ratepayers facing deferral costs.

The program, designed to provide relief to Albertans hit hard by high utility bills and soaring energy prices, will cost the Alberta government $600 million.

Albertans who have consumed electricity within the past calendar year, up to a maximum of 250 megawatt hours per year, are eligible for the rebates, which will be automatically applied to consumer bills, as seen in Ontario electricity bill support initiatives.

The rebates will apply to the entire bill, similar to a lump-sum credit in Newfoundland and Labrador, not just the energy portion, the government said. The rebates will be automatic and no application will be needed.

Starting October, the government will enact a natural gas rebate program until March 2023 that will kick in when prices exceed $6.50 per gigajoule, and Alberta's consumer price cap on electricity will remain in place.

 

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Seattle Apartment Fire Caused by Overheated Power Strip

Seattle Capitol Hill Apartment Fire highlights an electrical fire from an overheated power strip, a two-alarm response by 70 firefighters, safe evacuation, displaced resident aid, and prevention tips like smoke detectors and load limits.

 

Key Points

Two-alarm early-morning blaze in Seattle traced to an overheated power strip, displacing one resident and injuring none.

✅ Origin: overheated power strip ignited nearby combustibles

✅ Response: 70 firefighters, two-alarm, rapid containment

✅ Safety: avoid overloads; inspect cords; use smoke detectors

 

An early-morning fire in Seattle’s Capitol Hill neighborhood severely damaged a three-story apartment building, displacing one resident. The blaze, which broke out around 4:34 a.m. on a Friday, drew more than 70 firefighters to the scene, as other critical sectors have implemented on-site staffing during outbreaks to maintain operations, and was later traced to an overheated power strip.

The Fire Incident

The Seattle Fire Department responded to the fire, which had started on the second floor of the building in the 1800 block of 12th Avenue. Upon arrival, crews were met with heavy smoke and flames coming from one unit. The fire quickly spread to a unit on the third floor, prompting the Seattle Fire Department to escalate their response to a two-alarm fire due to its size and the potential threat to nearby structures.

Firefighters initially attempted to contain the blaze from the exterior before they moved inside the building to fully extinguish the fire. Thankfully, the fire was contained to the two affected units, preventing the destruction of the remaining seven apartments in the building.

All residents safely evacuated the building on their own. Despite the substantial damage to the two apartments, no injuries were reported. One resident was displaced by the fire and was assisted by the Red Cross in finding temporary accommodation.

Cause of the Fire

Investigators later determined that the fire was accidental, most likely caused by an overheated electrical power strip. The power strip had reportedly ignited nearby combustible materials, sparking the flames that quickly spread throughout the unit. Although the exact details are still under investigation, the fire serves as a stark reminder of the potential risks associated with overloaded or damaged electrical equipment and how electrical safety knowledge gaps can contribute to incidents.

The Risks of Power Strips

Power strips, while essential for providing multiple outlets, can pose a serious fire hazard if used improperly, and specialized arc flash training in Vancouver underscores the importance of understanding electrical hazards across settings.

This fire in Seattle highlights the importance of maintaining electrical devices and following proper usage guidelines. According to experts, it is crucial to regularly inspect power strips for any visible damage, such as frayed cords or scorch marks, and to replace them if necessary. It's also advisable to avoid using power strips with high-power appliances like space heaters, microwaves, or refrigerators.

Impact and Community Response

The fire has raised awareness about the dangers of electrical hazards in residential buildings, especially in older apartment complexes where wiring systems may not be up to modern standards. Local authorities and fire safety experts are urging residents to review safety guidelines and ensure that their living spaces are free from potential fire hazards and to avoid dangerous stunts at dams and towers that can lead to serious injuries.

Seattle's fire department, which responded to this incident, continues to emphasize fire prevention and safety education. This event also highlights the importance of having working smoke detectors and clear escape routes in apartment buildings, and ongoing fire alarm training can improve system reliability. The Seattle Fire Department recommends that all tenants know the locations of fire exits and practice safe evacuation procedures, especially in high-rise or multi-unit buildings.

Additionally, the Red Cross has stepped in to assist the displaced resident. The organization provides temporary shelter, food, and financial aid for those affected by disasters like fires. The fire underscores the importance of having emergency preparedness plans in place and the need for immediate relief for those who lose their homes in such incidents.

The Seattle apartment fire, which displaced one resident and caused significant damage to two units, serves as a reminder of the potential dangers associated with improperly maintained or overloaded electrical devices, especially power strips, and how industry recognition, such as a utility safety award, reinforces best practices. While the cause of this fire was linked to an overheated power strip, it could have easily been prevented with regular inspections and safer practices.

As fire departments continue to respond to similar incidents, it is critical for residents to stay informed about fire safety, particularly regarding electrical equipment and outdoor hazards like safety near downed power lines in storm conditions. Awareness, proper maintenance, and following safety protocols can significantly reduce the risk of electrical fires and help protect residents from harm.

 

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Britain breaks record for coal-free power generation - but what does this mean for your energy bills?

UK Coal-Free Electricity Record highlights rapid growth in renewables as National Grid phases out coal; wind, solar, and offshore projects surge, green tariffs expand, and energy comparison helps consumers switch to cheaper, cleaner deals.

 

Key Points

Britain's longest coal-free run, enabled by renewables, lower demand, and grid shifts for cheaper, greener tariffs.

✅ Record set after two months without coal-fired generation

✅ Renewables outpace fossil fuels; wind and solar dominate

✅ Green tariffs expand; prices at three-year lows

 

On Wednesday 10 June, Britain hit a significant landmark: the UK went for two full months without burning coal to generate power – that's the longest period since the 1880s, following earlier milestones such as a full week without coal power in the recent past.

According to the National Grid, Britain has now run its electricity network without burning coal since midnight on the 9 April. This coal-free period has beaten the country’s previous record of 18 days, six hours and 10 minutes, which was set in June 2019, even though low-carbon generation stalled in 2019 according to analyses.

With such a shift in Britain’s drive for renewables and lower electricity demand following the coronavirus lockdown, as Britain recorded its cleanest electricity during lockdown to date, now may be the perfect time to do an online energy comparison and switch to a cheaper, greener deal.

Only a decade ago, around 40 per cent of Britain’s electricity came from coal generation, but since then the country has gradually shifted towards renewable energy, with the coal share at record lows in the system today. When Britain was forced into lockdown in response to the coronavirus pandemic, electricity demand dropped sharply, and the National Grid took the four remaining coal-fired plants off the network.

Over the past 10 years, Britain has invested heavily in renewable energy. Back in 2010, only 3 per cent of the country's electricity came from wind and solar, and many people remained sceptical. However, now, the UK has the biggest offshore wind industry in the world. Plus, last year, construction of the world’s single largest wind farm was completed off the coast of Yorkshire.

At the same time, Drax – Britain’s biggest power plant – has started to switch from burning coal to burning compressed wooden pellets instead, reflecting the UK's progress as it keeps breaking its coal-free energy record again across the grid. By this time next year, the plant hopes to have phased out coal entirely.

So far this year, renewables have generated more power than all fossil fuels put together, the BBC reports, and the energy dashboard shows the current mix in real time. Renewables have been responsible for 37 per cent of electricity supplied to the network, with wind and solar surpassing nuclear for the first time, while fossil fuels have accounted for 35 per cent. During the same period, nuclear accounted for 18 per cent and imports made up the remaining 10 per cent.

What does this mean for consumers?

As the country’s electricity supply moves more towards renewables, customers have more choice than ever before. Most of the ‘Big Six’ energy companies now have tariffs that offer 100 per cent green electricity. On top of this, specialist green energy suppliers such as Bulb, Octopus and Green Energy UK make it easier than ever to find a green energy tariff.

The good news is that our energy comparison research suggests that green energy doesn’t have to cost you more than a traditional fixed-price energy contract would. In fact, some of the cheapest energy suppliers are actually green companies.

At present, energy bills are at three-year lows, which means that now is the perfect time to switch supplier. As prices remain low and renewables begin to dominate the marketplace, more switchers will be drawn to green energy deals than ever before.

However, if you’re interested in choosing a green energy supplier, make sure that you look at the company's fuel mix. This way, you’ll be able to see whether they are guaranteeing the usage of green energy, or whether they’re just offsetting your usage. All suppliers must report how their energy is generated to Ofgem, so you’ll easily be able to compare providers.

You may find that you pay more for a supplier that generates its own energy from renewables, or pay less if the supplier simply matches your usage by buying green energy. You can decide which option is right for you after comparing the prices.

 

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US NRC issues final safety evaluation for NuScale SMR

NuScale SMR Design Certification marks NRC Phase 6 FSER approval, validating small modular reactor safety and design review, enabling UAMPS deployment at Idaho National Laboratory and advancing DOE partnerships and Canadian vendor assessments.

 

Key Points

It is the NRC FSER approval confirming NuScale SMR safety design, enabling licensed deployment and vendor reviews.

✅ NRC Phase 6 FSER concludes design certification review

✅ Valid 15 years; enables site-independent licensing

✅ 60 MW modules, up to 12 per plant; UAMPS project at Idaho National Laboratory

 

US-based NuScale Power announced on 28 August that the US Nuclear Regulatory Commission (NRC) had completed Phase 6 review—the last and final phase—of the Design Certification Application (DCA) for its small modular reactor (SMR) with the issuance of the Final Safety Evaluation Report (FSER).

The FSER represents completion of the technical review and approval of the NuScale SMR design. With this final phase of NuScale’s DCA now complete, customers can proceed with plans to develop NuScale power plants as Ontario breaks ground on first SMR projects advance, with the understanding that the NRC has approved the safety aspects of the NuScale design.

“This is a significant milestone not only for NuScale, but also for the entire US nuclear sector and the other advanced nuclear technologies that will follow,” said NuScale chairman and CEO John Hopkins.

“The approval of NuScale’s design is an incredible accomplishment and we would like to extend our deepest thanks to the NRC for their comprehensive review, to the US Department of Energy (DOE) for its continued commitment to our successful private-public partnership to bring the country’s first SMR to market, and to the many other individuals who have dedicated countless hours to make this extraordinary moment a reality,” he added. “Additionally, the cost-shared funding provided by Congress over the past several years has accelerated NuScale’s advancement through the NRC Design Certification process.”

NuScale’s design certification application was accepted by the NRC in March 2017. NuScale spent over $500 million, with the backing of Fluor, and over 2 million hours to develop the information needed to prepare its DCA application, an effort that, similar to Rolls-Royce’s MoU with Exelon, underscores private-sector engagement to advance nuclear innovation. The company also submitted 14 separate Topical Reports in addition to the over 12,000 pages for its DCA application and provided more than 2 million pages of supporting information for NRC audits.

NuScale’s SMR is a fully factory-fabricated, 60MW power module based on pressurised water reactor technology. The scalable design means a power plant can house up to 12 individual power modules, and jurisdictions like Ontario have announced plans for four SMRs at Darlington to leverage modularity.

The NuScale design is so far the only small modular reactor to undergo a design certification review by the NRC, while in the UK UK approval for Rolls-Royce SMR is expected by mid-2024, signaling parallel regulatory progress. The design certification process addresses the various safety issues associated with the proposed nuclear power plant design, independent of a specific site and is valid for 15 years from the date of issuance.

NuScale's first customer, Utah Associated Municipal Power Systems (UAMPS), is planning a 12-module SMR plant at a site at the Idaho National Laboratory as efforts like TerraPower's molten-salt mini-reactor advance in parallel. Construction was scheduled to start in 2023, with the first module expected to begin operation in 2026. However, UAMPS has informed NuScale it needs to push back the timeline for operation of the first module from 2026 to 2029, the Washington Examiner reported on 24 August.

The NuScale SMR is also undergoing a vendor design review with the Canadian Nuclear Safety Commission, amid provincial activity such as New Brunswick's SMR debate that highlights domestic interest. NuScale has signed agreements with entities in the USA, Canada, Romania, the Czech Republic, and Jordan.

 

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Project examines potential for Europe's power grid to increase HVDC Technology

HVDC-WISE Project accelerates HVDC technology integration across the European transmission system, delivering a planning toolkit to boost grid reliability, resilience, and interconnectors for renewables and offshore wind amid climate, cyber, and physical threats.

 

Key Points

EU-funded project delivering tools to integrate HVDC into Europe's grid, improving reliability, resilience, and security.

✅ EU Horizon Europe-backed consortium of 14 partners

✅ Toolkit to assess extreme events and grid operability

✅ Supports interconnectors, offshore wind, and renewables

 

A partnership of 14 leading European energy industry companies, research organizations and universities has launched a new project to identify opportunities to increase integration of HVDC technology into the European transmission system, echoing calls to invest in smarter electricity infrastructure from abroad.

The HVDC-WISE project, in which the University of Strathclyde is the UK’s only academic partner, is supported by the European Union’s Horizon Europe programme.

The project’s goal is to develop a toolkit for grid developers to evaluate the grid’s performance under extreme conditions and to plan systems, leveraging a digital grid approach that supports coordination to realise the full range of potential benefits from deep integration of HVDC technology into the European transmission system.

The project is focused on enhancing electric grid reliability and resilience while navigating the energy transition. Building and maintaining network infrastructure to move power across Europe is an urgent and complex task, and reducing losses with superconducting cables can play a role, particularly with the continuing growth of wind and solar generation. At the same time, threats to the integrity of the power system are on the rise from multiple sources, including climate, cyber, and physical hazards.

 

Mutual support

At a time of increasing worries about energy security and as Europe’s electricity systems decarbonise, connections between them to provide mutual support and routes to market for energy from renewables, a dynamic also highlighted in discussions of the western Canadian electricity grid in North America, become ever more important.

In modern power systems, this means making use of High Voltage Direct Current (HVDC) technology.

The earliest forms of technology have been around since the 1960s, but the impact of increasing reliance on HVDC and its ability to enhance a power system’s operability and resilience are not yet fully understood.

Professor Keith Bell, Scottish Power Professor of Future Power Systems at the University of Strathclyde, said:

As an island, HVDC is the only practical way for us to build connections to other countries’ electricity systems. We’re also making use of it within our system, with one existing and more planned Scotland-England subsea link projects connecting one part of Britain to another.

“These links allow us to maximise our use of wind energy. New links to other countries will also help us when it’s not windy and, together with assets like the 2GW substation now in service, to recover from any major disturbances that might occur.

“The system is always vulnerable to weather and things like lightning strikes or short circuits caused by high winds. As dependency on electricity increases, insights from electricity prediction specialists can inform planning as we enhance the resilience of the system.”

Dr Agusti Egea-Alvarez, Senior Lecturer at Strathclyde, said: “HVDC systems are becoming the backbone of the British and European electric power network, either interconnecting countries, or connecting offshore wind farms.

“The tools, procedures and guides that will be developed during HVDC-WISE will define the security, resilience and reliability standards of the electric network for the upcoming decades in Europe.”

Other project participants include Scottish Hydro Electric Transmission, the Supergrid Institute, the Electric Power Research Institute (EPRI) Europe, Tennet TSO, Universidad Pontificia Comillas, TU Delft, Tractebel Impact and the University of Cyprus.

 

Climate change

Eamonn Lannoye, Managing Director of EPRI Europe, said: “The European electricity grid is remarkably reliable by any standard. But as the climate changes and the grid becomes exposed to more extreme conditions, energy interdependence between regions intensifies and threats from external actors emerge. The new grid needs to be robust to those challenges.”

Juan Carlos Gonzalez, a senior researcher with the SuperGrid Institute which leads the project said: “The HVDC-WISE project is intended to provide planners with the tools and know-how to understand how grid development options perform in the context of changing threats and to ensure reliability.”

HVDC-WISE is supported by the European Union’s Horizon Europe programme under agreement 101075424 and by the UK Research and Innovation Horizon Europe Guarantee scheme.

 

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Rio Tinto seeking solutions that transform heat from underground mines into electricity

Rio Tinto waste heat-to-electricity initiative captures underground mining thermal energy at Resolution Copper, Arizona, converting it to renewable power for cooling systems and microgrids, advancing decarbonization, energy efficiency, and the miner's 2050 carbon-neutral goal.

 

Key Points

A program converting underground thermal energy into on-site electricity to cut emissions and support mine cooling.

✅ Captures low-grade heat from rock and geothermal water.

✅ Generates electricity for ventilation, refrigeration, microgrids.

✅ Scalable, safe, and grid- or storage-ready for peak demand.

 

The world’s second-largest miner, Rio Tinto announced that it is accepting proposals for solutions that transform waste heat into electricity for reuse from its underground operations.

In a press release, the company said this initiative is aimed at drastically reducing greenhouse gas emissions, even as energy-intensive projects like bitcoin mining operations expand, so that it can achieve its goal of becoming carbon neutral by 2050.

Initially, the project would be implemented at the Resolution copper mine in Arizona, which Rio owns together with BHP (ASX, LON: BHP). At this site, massive electrically-driven refrigeration and ventilation systems, aligned with broader electrified mining practices, are in charge of cooling the work environment because of the latent heat from the underground rock and groundwater. 

THE INITIATIVE IS AIMED AT REDUCING GREENHOUSE GAS EMISSIONS SO THAT RIO CAN ACHIEVE ITS GOAL OF BECOMING CARBON NEUTRAL BY 2050

“When operating, the Resolution copper mine will be a deep underground block cave mine some 7,000 feet (~2 kilometres) deep, with ambient air temperatures ranging between 168°F to 180°F (76°C to 82°C), conditions that, during heat waves, when bitcoin mining power demand can strain local grids, further heighten cooling needs, and underground water at approximately 194°F (90°C),” the media brief states.

“Rio Tinto is seeking solutions to capture and reuse the heat from underground, contributing towards powering the equipment needed to cool the operations. The solution to capture and convert this thermal energy into electrical energy, such as emerging thin-film thermoelectrics, should be safe, environmentally friendly and cost-effective.”

The miner also said that, besides capturing heat for reuse, the solution should generate electrical energy from low range temperatures below the virgin rock temperature and/or from the high thermal water coming from the underground rock, similar to using transformer waste heat for heating in the power sector. 

At the same time, the solution should be scalable and easily transported through the many miles of underground tunnels that will be built to ventilate, extract and move copper ore to the surface.

Rio requires proposals to offer the possibility of distributing the electrical energy generated back into the electrical grid from the mining operation or stored and used at a later stage when energy is required during peak use periods, especially as jurisdictions aim to use more electricity for heat in colder seasons. 

 

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