B.C. Hydro predicts 'bottleneck' as electric-vehicle demand ramps-up


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B.C. EV Bottleneck signals a post-pandemic demand surge for electric vehicles amid semiconductor and lithium-ion battery shortages, driving waitlists, record sales, rebates, charging infrastructure needs, and savings on fuel and maintenance across British Columbia.

 

Key Points

B.C. EV bottleneck is rising demand outpacing supply from chip and battery shortages, creating waitlists.

✅ 85% delayed EV purchase; demand rebounds with reopening.

✅ Supply chain limits: chips and lithium-ion batteries.

✅ Plan ahead: join waitlists, consider used EVs, claim rebates.

 

B.C. Hydro is warning of a post-pandemic “EV bottleneck” as it predicts pent-up demand and EV shortages will lead to record-breaking sales for electric vehicles in 2021.

A new survey by B.C. Hydro found 85 per cent of British Columbians put off buying an electric vehicle during the pandemic, but as the province reopens, the number of people on the road commuting to-and-from work and school is expected to rise 15 per cent compared with before the pandemic.

It found about two-thirds of British Columbians are considering buying an EV over the next five years, with 60 per cent saying they would go with an EV if they can get one sooner.

“The EV market is at a potential tipping point, as demand is on the rise and will likely continue to grow long-term, with one study projecting doubling power output to meet full road electrification,” said a report about the findings released Wednesday.

The demand for EVs is prompted by rising gas prices, environmental concerns and to save money on maintenance costs like oil changes and engine repairs, said the report. At the same time, a shortage of semiconductor chips and lithium ion batteries needed for auto production is squeezing supply.

For people wanting to make the switch to electric, B.C. Hydro recommended they plan ahead and get on several waiting lists and explore networks offering faster charging options. Used EVs are also a cheaper option.

B.C. Hydro said an electric vehicle can save 80 per cent in gas expenses over a year and about $100 a month in maintenance costs compared with a gas-powered vehicle. There are also provincial and federal rebates of up to $8,000 for EV purchases in B.C., and additional charger rebates can help with installation costs.

B.C. has the highest electric vehicle uptake in North America, with zero-emission vehicles making up almost 10 per cent of all car sales in the province in 2020 as the province expands EV charging to support growth — more than double the four per cent in 2018.

According to a report by University of B.C. business Prof. Werner Antweiler on the state of EV adoption in B.C., electric vehicles are still concentrated in urban areas like Metro Vancouver and the Capital Regional District on Vancouver Island where public charging stations are more readily available.

He said electric vehicle purchases are still hampered by limited choice and a lack of charging stations, especially for people who park on the street or in condo parkades, which would require permission from strata councils to install a charging station, though rebates for home and workplace charging can ease installation.

The online survey was conducted by market researcher Majid Khoury of 800 British Columbians from May 17-19. It has a margin of error of plus-or-minus 3.5 per cent, 19 times out of 20.

 

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Prairie Provinces to lead Canada in renewable energy growth

Canada Renewable Power sees Prairie Provinces surge as Canada Energy Regulator projects rising wind, solar, and hydro capacity in Alberta, Saskatchewan, and Manitoba, replacing coal, expanding the grid, and lowering emissions through 2023.

 

Key Points

A CER outlook on Canada's grid: Prairie wind, solar, and hydro growth replacing coal and cutting emissions by 2023.

✅ Prairie wind, solar capacity surge by 2023

✅ Alberta, Saskatchewan shift from coal to renewables, gas

✅ Manitoba strengthens hydro leadership, low-carbon grid

 

Canada's Prairie Provinces will lead the country's growth in renewable energy capacity over the next three years, says a new report by the Canada Energy Regulator (CER).

The online report, titled Canada's Renewable Power, says decreased reliance on coal and substantial increases in wind and solar capacity will increase the amount of renewable energy added to the grid in Alberta and Saskatchewan. Meanwhile, Manitoba will strengthen its position as a prominent hydro producer in Canada. The pace of overall renewable energy growth is expected to slow at the national level between 2021 and 2023, in part due to lagging solar demand in some markets, but with strong growth in provinces with a large reliance on fossil fuel generation.

The report explores electricity generation in Canada and provides a short-term outlook for renewable electricity capacity in each province and territory to 2023. It also features a series of interactive visuals that allow for comparison between regions and highlights the diversity of electricity sources across Canada.

Electricity generation from renewable sources is expected to continue increasing as demand for electricity grows and the country continues its transition to a lower-carbon economy. Canada will see gradual declines in overall carbon emissions from electricity generation largely due to Saskatchewan, Alberta, Nova Scotia and New Brunswick replacing coal with renewables and natural gas. The pace of growth beyond 2023 in renewable power will depend on technological developments; consumer preferences; and government policies and programs.

Canada is a world leader in renewable power, generating almost two-thirds of its electricity from renewables with hydro as the dominant source, and the country ranks in the top 10 for hydropower jobs worldwide. Canada also has one of the world's lowest carbon intensities for electricity.

The CER produces neutral and fact-based energy analysis to inform the energy conversation in Canada. This report is part of a portfolio of publications on energy supply, demand and infrastructure that the CER publishes regularly as part of its ongoing market monitoring.

Report highlights

  • Wind capacity in Saskatchewan is projected to triple and nearly double in Alberta between 2020 and 2023 as wind power becomes more competitive in the market. Significant solar capacity growth is also projected, with Alberta adding 1,200 MW by 2023, as Canada approaches a 5 GW solar milestone by that time.
  • In Alberta, the share of renewables in the capacity mix is expected to increase from 16% in 2017 to 26% by 2023, with a renewable energy surge supporting thousands of jobs. Similarly, Saskatchewan's renewable share of capacity is expected to increase from 25% in 2018 to 33% in 2023.
  • Renewable capacity growth slows most notably in Ontario, where policy changes have scaled back growth projections. Between 2010 and 2017, renewable capacity grew 6.8% per year. Between 2018 and 2023, growth in Ontario slows to 0.4% per year as capacity grows by 466 MW over this period.
  • New large-scale hydro, wind, and solar projects will push the share of renewables in Canada's electricity mix from 67% of installed capacity in 2017 to 71% in 2023.
  • Hydro is the dominant source of electricity in Canada accounting for 55% of total installed capacity and 59% of generation, though Alberta's limited hydro stands as a notable exception, with B.C., Manitoba, Quebec, Newfoundland and Labrador, and Yukon deriving more than 90% of their power from hydro.
  • The jurisdictions with the highest percentage of non-hydro renewable electricity generation are PEI (100%), Nova Scotia (15.8%), and Ontario (10.5%).
  • In 2010, 62.8% of Canada's total electricity generation (364 681 GW‧h) was from renewable sources. By 2018, 66.2% (425 722 GW‧h) was from renewable sources and projected to be 71.0% by 2023.

 

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NREL’s Electric Vehicle Infrastructure Projection Tool Helps Utilities, Agencies, and Researchers Predict Hour-by-Hour Impact of Charging on the Grid

EVI-Pro Lite EV Load Forecasting helps utilities model EV charging infrastructure, grid load shapes, and resilient energy systems, factoring home, workplace, and public charging behavior to inform planning, capacity upgrades, and flexible demand strategies.

 

Key Points

A NREL tool projecting EV charging demand and load shapes to help utilities plan the grid and right-size infrastructure.

✅ Visualizes weekday/weekend EV load by charger type.

✅ Tests home, workplace, and public charging access scenarios.

✅ Supports utility planning, demand flexibility, and capacity upgrades.

 

As electric vehicles (EVs) continue to grow in popularity, utilities and community planners are increasingly focused on building resilient energy systems that can support the added electric load from EV charging, including a possible EV-driven demand increase across the grid.

But forecasting the best ways to adapt to increased EV charging can be a difficult task as EV adoption will challenge state power grids in diverse ways. Planners need to consider when consumers charge, how fast they charge, and where they charge, among other factors.

To support that effort, researchers at the National Renewable Energy Laboratory (NREL) have expanded the Electric Vehicle Infrastructure Projection (EVI-Pro) Lite tool with more analytic capabilities. EVI-Pro Lite is a simplified version of EVI-Pro, the more complex, original version of the tool developed by NREL and the California Energy Commission to inform detailed infrastructure requirements to support a growing EV fleet in California, where EVs bolster grid stability through coordinated planning.

EVI-Pro Lite’s estimated weekday electric load by charger type for El Paso, Texas, assuming a fleet of 10,000 plug-in electric vehicles, an average of 35 daily miles traveled, and 50% access to home charging, among other variables, as well as potential roles for vehicle-to-grid power in future scenarios. The order of the legend items matches the order of the series stacked in the chart.

Previously, the tool was limited to letting users estimate how many chargers and what kind of chargers a city, region, or state may need to support an influx of EVs. In the added online application, those same users can take it a step further to predict how that added EV charging will impact electricity demand, or load shapes, in their area at any given time and inform grid coordination for EV flexibility strategies.

“EV charging is going to look different across the country, depending on the prevalence of EVs, access to home charging, and the kind of chargers most used,” said Eric Wood, an NREL researcher who led model development. “Our expansion gives stakeholders—especially small- to medium-size electric utilities and co-ops—an easy way to analyze key factors for developing a flexible energy strategy that can respond to what’s happening on the ground.”

Tools to forecast EV loads have existed for some time, but Wood said that EVI-Pro Lite appeals to a wider audience, including planners tracking EVs' impact on utilities in many markets. The tool is a user-friendly, free online application that displays a clear graphic of daily projected electric loads from EV charging for regions across the country.

After selecting a U.S. metropolitan area and entering the number of EVs in the light-duty fleet, users can change a range of variables to see how they affect electricity demand on a typical weekday or weekend. Reducing access to home charging by half, for example, results in higher electric loads earlier in the day, although energy storage and mobile charging can help moderate peaks in some cases. That is because under such a scenario, EV owners might rely more on public or workplace charging instead of plugging in at home later in the evening or at night.

“Our goal with the lite version of EVI-Pro is to make estimating loads across thousands of scenarios fast and intuitive,” Wood said. “And if utilities or stakeholders want to take that analysis even deeper, our team at NREL can fill that gap through partnership agreements, too. The full version of EVI-Pro can be tailored to develop detailed studies for individual planners, agencies, or utilities.”

 

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Spain Breaks Gas Link with Wind and Solar

Spain has broken its reliance on fossil gas as soaring wind and solar energy drive Europe’s lowest wholesale electricity prices, reducing emissions, stabilizing the grid, and advancing renewable power, energy independence, and clean transition goals across the EU.

 

How Has Spain Broken the Gas Link with Wind and Solar??

Spain has broken the link between gas and power prices by rapidly expanding wind and solar generation, which now supplies nearly half its electricity, cutting fossil fuel influence by 75% since 2019 and reducing power costs 32% below the EU average.

✅ Wind and solar cut fossil influence by 75% since 2019

✅ Power prices 32% below EU average in 2025

✅ Renewables meet nearly half of national electricity demand

 

Spain has emerged as one of Europe’s most affordable electricity markets, largely due to its rapid expansion of wind and solar power. By decoupling its wholesale electricity prices from volatile fossil gas and coal, Spain has achieved a 32 percent lower average wholesale price than the EU average in the first half of 2025. This remarkable shift marks a dramatic turnaround from 2019, when Spain had some of the highest power prices in Europe.

According to new data, the influence of fossil fuels on Spain’s electricity prices has fallen by 75 percent since 2019, mirroring how renewables have surpassed fossil fuels in Europe over the same period, dropping from 75 percent of hours tied to gas costs to just 19 percent in early 2025. “Spain has broken the ruinous link between power prices and volatile fossil fuels, something its European neighbours are desperate to do,” said Dr. Chris Rosslowe, Senior Energy Analyst at Ember.

The change is driven by a surge in renewable generation. Between 2019 and mid-2025, Spain added more than 40 gigawatts of new solar and wind capacity—second only to Germany, whose power market is twice the size. Wind and solar now meet nearly half (46 percent) of Spain’s electricity demand, compared with 27 percent six years ago. As a result, fossil generation has fallen to 20 percent of total demand, well below the levels seen in other major economies such as Germany (41 percent) and Italy (43 percent).

This renewable growth has also cut Spain’s dependence on imported fuels. In the past five years, new solar and wind plants have avoided 26 billion cubic metres of gas imports, saving €13.5 billion—five times the amount the country invested in transmission infrastructure over the same period. The Central Bank of Spain estimated that wholesale electricity prices would have been 40 percent higher in 2024 if renewables had not displaced fossil generation, and neighboring France has seen negative prices during periods of renewable surplus.

August 2025 marked a historic milestone: Spain recorded a full month without coal-fired generation for the first time. A decade earlier, coal accounted for a quarter of the nation’s electricity supply. Gas use has also declined steadily, from 26% of demand in 2019 to 19% this year.

However, the system still faces challenges. Following the April 28th Iberian blackout, Spain has relied more heavily on gas-fired plants to stabilize the grid. These services—such as voltage control and balancing—have proven to be expensive, with costs doubling since the blackout and accounting for 57 percent of the average electricity price in May 2025, up from 14 percent the previous year. Curtailment of renewables has also tripled, reaching 7.2 percent of generation between May and July.

Despite being Europe’s fourth-largest electricity market, Spain ranks only 13th in battery storage capacity, underscoring the need for further investment in clean flexibility solutions, such as grid-scale batteries to provide flexibility and stronger interconnections. Post-blackout reforms aim to address this weakness and ensure the gains from renewable integration are not lost.

“Spain risks sliding back into costly gas reliance amid post-blackout fears,” warned Rosslowe. “Boosting grids and batteries will help Spain break free from fossil dependency for good.”

With record-low electricity prices and one of the fastest decoupling rates in Europe, Spain’s experience demonstrates how large-scale wind and solar adoption can reshape energy economics—and offers a roadmap for other nations seeking to escape the volatility of fossil fuels.

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0 to 180 km in 10 minutes: B.C. Hydro rolls out faster electric vehicle charging

B.C. Hydro fast EV charging stations roll out 180 kW DC fast chargers, power sharing, and rural network expansion in Surrey, Manning Park, Mackenzie, and Tumbler Ridge to ease range anxiety across northern B.C.

 

Key Points

180 kW DC chargers with power sharing, expanding B.C.'s rural EV network to cut range anxiety and speed up recharging.

✅ 180 kW DC fast charging: ~180 km added in about 10 minutes

✅ Power sharing enables two vehicles to use one unit simultaneously

✅ Expands rural charging coverage to cut range anxiety for northern B.C.

 

B.C. Hydro has unveiled plans to install new charging stations it says can add as much as 180 kilometres worth of range to the average electric vehicle in 10 minutes.

The utility says the new 180-kilowatt units will be added to its network, expanding stations in southern B.C. as soon as this fall, with even more scheduled to arrive in 2024.

The first communities to get the new faster-charge stations are Surrey, Manning Park and, north of Prince George, Mackenzie and Tumbler Ridge, while the Lillooet fast-charging site is already operational.

B.C. Hydro president Chris O'Riley says both current and prospective electric vehicle owners have said they want improved coverage in more rural parts of the province in order to address range anxiety, as the utility has warned of a potential EV charging bottleneck if demand outpaces infrastructure.

"We are listening to feedback from our customers," he said.

The new stations will also be the first from B.C. Hydro to offer power sharing, which lets two different vehicles use the same unit to charge at the same time.

The adoption of electric vehicles in B.C. is much higher in southern urban areas than rural, northern ones, according to statistics from the provincial government made available in 2022, as the province leads the country in going electric according to recent reports.

The figures showed about one in every 45 people owns a zero-emission vehicle in the southwest regions of the province, but that number drops to one in 232 in the Kootenays, where the region makes electric cars a priority through local initiatives, and one in 414 in northern B.C.

The number of public charging stations closely corresponds to the number of zero-emission vehicles in various regions.

The Vancouver area has more than 500 fast-charging ports, according to ChargeHub, a website that tracks charging stations in North America. 

In contrast, the route from Prince George to Fort Nelson via Dawson Creek along Highway 97, part of the B.C. Electric Highway network connecting the region — a distance of more than 800 kilometres — has just three locations where a vehicle can be charged to 80 per cent power in an hour or less, creating challenges for people hoping to travel the route.

The disparity is also clear in a just-published analysis from the non-profit Community Energy Association, which acts as an advisory group to government associations. 

It found that while there is roughly one charging port every three square kilometres in Metro Vancouver, the number drops to one every 250 square kilometres in the Regional District of East Kootenay and one every 3,500 square kilometres in the Peace River Regional District, in the province's northeast.

"The more infrastructure we can get across the region ... the more the adoption of electric vehicles will increase," said the association's director of transportation initiatives, Danielle Weiss.

"We are excited to hear that B.C. Hydro is also viewing rural areas as a key focus for their new, enhanced charging technology."

B.C. Hydro says it currently has 153 charging units at 84 locations across the province with plans to add an additional 3,000 ports over the next 10 years, with provincial EV charger rebates supporting home and workplace installations as well.

 

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Biden's interior dept. acts quickly on Vineyard Wind

Vineyard Wind I advances as BOEM issues a final environmental impact statement for the 800 MW offshore wind farm south of Martha's Vineyard, delivering clean energy, jobs, and carbon reductions to Massachusetts toward net-zero.

 

Key Points

An 800 MW offshore wind project near Martha's Vineyard supplying clean power to Massachusetts.

✅ 800 MW capacity; power for 400,000+ homes and businesses

✅ BOEM final EIS; record of decision pending within 30+ days

✅ 1.68M metric tons CO2 avoided annually; jobs and lower rates

 

Federal environmental officials have completed their review of the Vineyard Wind I offshore wind farm, moving the project that is expected to deliver clean renewable energy to Massachusetts by the end of 2023 closer to becoming a reality.

The U.S. Department of the Interior said Monday morning that its Bureau of Ocean Energy Management completed the analysis it resumed about a month ago, published the project's final environmental impact statement, and said it will officially publish notice of the impact statement in the Federal Register later this week.

"More than three years of federal review and public comment is nearing its conclusion and 2021 is poised to be a momentous year for our project and the broader offshore wind industry," Vineyard Wind CEO Lars Pedersen said. "Offshore wind is a historic opportunity to build a new industry that will lead to the creation of thousands of jobs, reduce electricity rates for consumers and contribute significantly to limiting the impacts of climate change. We look forward to reaching the final step in the federal permitting process and being able to launch an industry that has such tremendous potential for economic development in communities up and down the Eastern seaboard."

The 800-megawatt wind farm planned for 15 miles south of Martha's Vineyard was the first offshore wind project selected by Massachusetts utility companies with input from the Baker administration to fulfill part of a 2016 clean energy law. It is projected to generate cleaner electricity for more than 400,000 homes and businesses in Massachusetts, produce at least 3,600 jobs, reduce costs for Massachusetts ratepayers by an estimated $1.4 billion, and eliminate 1.68 million metric tons of carbon dioxide emissions annually.

Offshore wind power, informed by the U.S. offshore wind outlook, is expected to become an increasingly significant part of Massachusetts' energy mix. The governor and Legislature agree on a goal of net-zero carbon emissions by 2050, but getting there is projected to require having about 25 gigawatts of offshore wind power. That means Massachusetts will need to hit a pace in the 2030s where it has about 1 GW of new offshore wind power on the grid coming online each year.

"I think that's why today's announcement is so historic, because it does represent that culmination of work to understand how to permit and build a cost-effective and environmentally-responsible wind farm that can deliver clean energy to Massachusetts ratepayers, but also just how to do this from start to finish," said Energy and Environmental Affairs Secretary Kathleen Theoharides. "As we move towards our goal of probably [25 GW] of offshore wind by 2050 to hit our net-zero target, this does give us confidence that we have a much clearer path in terms of permitting."

She added, "There's a huge pipeline, so getting this project out really should open the door to the many additional projects up and down the East Coast, such as Long Island proposals, that will come after it."

According to the American Wind Energy Association, there are expected to be 14 offshore projects totaling 9,112 MW of capacity in operation by 2026.

Susannah Hatch, the clean energy coalition director for the Environmental League of Massachusetts and a leader of the broad-based New England for Offshore Wind Regional group, called offshore wind farms like Vineyard Wind "the linchpin of our decarbonization efforts in New England." She said the Biden administration's quick action on Vineyard Wind is a positive sign for the burgeoning sector.

"Moving swiftly on responsibly developed offshore wind is critical to our efforts to mitigate climate change, and offshore wind also provides an enormous opportunity to grow the economy, create thousands of jobs, and drive equitable economic benefits through increased minority economic participation in New England," Hatch said.

With the final environmental impact statement published, Vineyard Wind still must secure a record of decision from BOEM, which processes wind lease requests, an air permit from the Environmental Protection Agency and sign-offs from the U.S. Army Corps of Engineers and the National Marine Fisheries Service to officially clear the way for the project that is on track to be the nation's first utility-scale offshore wind farm. BOEM must wait at least 30 days from the publication of the final environmental impact statement to issue a record of decision.

Project officials have said they expect the final impact statement and then a record of decision "sometime in the first half of 2021." That would allow the project to hit its financial close milestone in the second half of this year, begin on-shore work quickly thereafter, start offshore construction in 2022, begin installing turbines in 2023 and begin exporting power to the grid, marking Vineyard Wind first power, by late 2023, Pedersen said in January.

"Offshore energy development provides an opportunity for us to work with Tribal nations, communities, and other ocean users to ensure all decisions are transparent and utilize the best available science," BOEM Director Amanda Lefton said.

The commercial fishing industry has been among the most vocal opponents of aspects of the Vineyard Wind project and the Responsible Offshore Development Alliance (RODA) has repeatedly urged the new administration to ensure the voices of the industry are heard throughout the licensing and permitting process.

In comments submitted earlier this month in response to a BOEM review of an offshore wind project that is expected to deliver power to New York, including the recent New York offshore wind approval, RODA said the present is "a time of significant confusion and change in the U.S. approach to offshore wind energy (OSW) planning" and detailed mitigation measures it wants to see incorporated into all projects.

"To be clear, none of these requests are new -- nor hardly radical. They have simply been ignored again, and again, and again in a political push/pull between multinational energy companies and the U.S. government, leaving world-famous seafood, and the communities founded around its harvest, off the table," the group said in a press release last week. Some of RODA's suggestions were analyzed as part of BOEM's Vineyard Wind review.

Vineyard Wind has certainly taken a circuitous path to get to this point. The timeline for the project was upended in August 2019 when the Trump administration decided to conduct a much broader assessment of potential offshore wind projects up and down the East Coast, which delayed the project by almost a year.

When the Trump administration delayed its action on a final environmental impact statement last year, Vineyard Wind on Dec. 1 announced that it was pulling its project out of the federal review pipeline in order to complete an internal study on whether the decision to use a certain type of turbine would warrant changes to construction and operations plan. The Trump administration declared the federal review of the project "terminated."

Within two weeks of President Joe Biden being inaugurated, Vineyard Wind said its review determined no changes were necessary and the company resubmitted its plans for review. BOEM agreed to pick up where the Trump administration had left off despite the agency previously declaring its review terminated.

"It would appear that fishing communities are the only ones screaming into a void while public resources are sold to the highest bidder, as BOEM has reversed its decision to terminate a project after receiving a single letter from Vineyard Wind," RODA said.

The final environmental impact statement that BOEM published Monday showed that the federal regulators believe the Vineyard Wind I development as proposed will have "moderate" impacts on commercial fisheries and for-hire recreational fishing outfits, and that the project combined with other factors not related to wind energy development will have "major" impacts on commercial and recreational fishing ventures.

Vineyard Wind pointed Monday to the fishery mitigation agreements it has entered into with Massachusetts and Rhode Island, a fishery science collaboration with the University of Massachusetts Dartmouth's School of Marine Science and Technology, and an agreement with leading environmental organizations around the protection of the endangered right whale.

Responding to concerns about safe navigation among RODA and others in the fishing sector, Vineyard Wind and the four other developers holding leases for offshore wind sites off New England agreed to orient their turbines in fixed east-to-west rows and north-to-south columns spaced one nautical mile apart. Last year, the U.S. Coast Guard concluded that the grid layout was the best way to maintain maritime safety and ease of navigation in the offshore wind development areas south of Martha's Vineyard and Nantucket.

Since a 2016 clean energy law kicked off the state's foray into the offshore wind world, Massachusetts utilities have contracted for a total of about 1,600 MW between two projects, Vineyard Wind I and Mayflower Wind.

A joint venture of Shell and Ocean Winds North America, Mayflower Wind was picked unanimously in 2019 by utility executives to build and operate a wind farm approximately 26 nautical miles south of Martha's Vineyard and 20 nautical miles south of Nantucket, with South Coast construction activity expected as the project progresses. The 804-megawatt project is expected to be operational by December 2025.

Massachusetts and its utilities are expected to go out to bid for up to another 1,600 MW of offshore wind generation capacity later this year using authorization granted by the Legislature in 2018.

The climate policy bill that Gov. Charlie Baker returned to the Legislature with amendments more than a month ago would require that the executive branch direct Massachusetts utilities to buy an additional 2,400 MW of offshore wind power.

 

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Solar and wind power curtailments are rising in California

CAISO Renewable Curtailments reflect grid balancing under transmission congestion and oversupply, reducing solar and wind output while leveraging WEIM trading, battery storage, and transmission expansion to integrate renewables and stabilize demand-supply.

 

Key Points

CAISO renewable curtailments are reductions in wind and solar output to balance grid amid congestion or oversupply.

✅ Driven mainly by transmission congestion, less by oversupply.

✅ Peaks in spring when demand is low and solar output is high.

✅ Mitigated by WEIM trades, new lines, and battery storage growth.

 

The California Independent System Operator (CAISO), the grid operator for most of the state, is increasingly curtailing solar- and wind-powered electricity generation, as reported in rising curtailments, as it balances supply and demand during the rapid growth of wind and solar power in California.

Grid operators must balance supply and demand to maintain a stable electric system as advances in solar and wind continue to scale. The output of wind and solar generators are reduced either through price signals or rarely, through an order to reduce output, during periods of:

Congestion, when power lines don’t have enough capacity to deliver available energy
Oversupply, when generation exceeds customer electricity demand

In CAISO, curtailment is largely a result of congestion. Congestion-related curtailments have increased significantly since 2019 because California's solar boom has been outpacing upgrades in transmission capacity.

In 2022, CAISO curtailed 2.4 million megawatthours (MWh) of utility-scale wind and solar output, a 63% increase from the amount of electricity curtailed in 2021. As of September, CAISO has curtailed more than 2.3 million MWh of wind and solar output so far this year, even as the US project pipeline is dominated by wind, solar, and batteries.

Solar accounts for almost all of the energy curtailed in CAISO—95% in 2022 and 94% in the first seven months of 2023. CAISO tends to curtail the most solar in the spring when electricity demand is relatively low (because moderate spring temperatures mean less demand for space heating or air conditioning) and solar output is relatively high, although wildfire smoke impacts can reduce available generation during fire season as well.

CAISO has increasingly curtailed renewable generation as renewable capacity has grown in California, and the state has even experienced a near-100% renewables moment on the grid in recent years. In 2014, a combined 9.0 gigawatts (GW) of wind and solar capacity had been built in California. As of July 2023, that number had grown to 17.6 GW. Developers plan to add another 3.0 GW by the end of 2024.

CAISO is exploring and implementing various solutions to its increasing curtailment of renewables, including:

The Western Energy Imbalance Market (WEIM) is a real-time market that allows participants outside of CAISO to buy and sell energy to balance demand and supply. In 2022, more than 10% of total possible curtailments were avoided by trading within the WEIM. A day ahead market is expected to be operational in Spring 2025.

CAISO is expanding transmission capacity to reduce congestion. CAISO’s 2022–23 Transmission Planning Process includes 45 transmission projects to accommodate load growth and a larger share of generation from renewable energy sources.

CAISO is promoting the development of flexible resources that can quickly respond to sudden increases and decreases in demand such as battery storage technologies that are rapidly becoming more affordable. California has 4.9 GW of battery storage, and developers plan to add another 7.6 GW by the end of 2024, according to our survey of recent and planned capacity changes. Renewable generators can charge these batteries with electricity that would otherwise have been curtailed.

 

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