Utility-scale batteries and pumped storage return about 80% of the electricity they store

Canada 2023 Clean Energy Outlook highlights decarbonization, renewables, a net-zero grid by 2035, hydrogen, energy storage, EV mandates, carbon pricing, and critical minerals, aligning with IRA incentives and provincial policies to accelerate the transition.

Key Points

A concise overview of Canada's 2023 path to net-zero: renewables, clean grids, storage, EVs, and hydrogen.

✅ Net-zero electricity regulations target 2035

✅ Alberta leads PPAs and renewables via deregulated markets

✅ Tax credits boost storage, hydrogen, EVs, and critical minerals

The year 2022 may go down as the most successful one yet for climate action. It was marked by monumental shifts in energy policy from governments, two COP meetings and heightened awareness of the private sector's duty to act.

In the U.S., the Inflation Reduction Act (IRA) was the largest federal legislation to tackle climate change, injecting $369 billion of tax credits and incentives for clean energy, Biden's EV agenda and carbon capture, energy storage, energy efficiency and research.

The European Union accelerated its green policies to transition away from fossil fuels and overhauled its carbon market. China and India made strides on clean energy and strengthened climate policies. The International Energy Agency made its largest revision yet as renewables continued to proliferate.

The U.S. ratified the Kigali Amendment, one of the strongest global climate policies to date.

Canada was no different. The 2022 Fall Economic Statement was announced to respond to the IRA, offering an investment tax credit for renewables, clean technology and green hydrogen alongside the Canada Growth Fund. The federal government also proposed a 2035 deadline for clean electrical grids and a federal zero-emissions vehicle (ZEV) sales mandate for light-duty vehicles.

With the momentum set, more action is promised in 2023: Canadian governments are expected to unveil firmer details for the decarbonization of electricity grids to meet 2035 deadlines; Alberta is poised to be an unlikely leader in clean energy.

Greater attention will be put on energy storage and critical minerals. Even an expected economic downturn is unlikely to stop the ball that is rolling.

Shane Doig, the head of energy and natural resources at KPMG in Canada, said events in 2022 demonstrated the complexity of the energy transformation and opened “a more balanced conversation around how Canada can transition to a lower carbon footprint, whilst balancing the need for affordable, readily available electricity.”

Expect further developments on clean electricity
2023 shapes up as a crucial year for Canada’s clean electricity grid.

The federal government announced it will pursue a net-zero electricity grid by 2035 under the Clean Electricity Regulations (CER) framework.

It requires mass renewable and clean energy adoption, phasing out fossil fuel electricity generation, rapid electrification and upgrading transmission and storage while accommodating growth in electricity demand.

The first regulations for consultation are expected early in 2023. The plans will lay out pollution regulations and costs for generating assets to accelerate clean energy adoption, according to Evan Pivnick, the clean energy program manager of Clean Energy Canada.

The Independent Energy System Operator of Ontario (IESO) recently published a three-part report suggesting a net-zero conversion for Ontario could cost $400 billion over 25 years, even as the province weighs an electricity market reshuffle to keep up with increasing electricity demand.

Power Utility released research by The Atmospheric Fund that suggests Ontario could reach a net-zero grid by 2035 across various scenarios, despite ongoing debates about Ontario's hydro plan and rate design.

Dale Beguin, executive vice president at the Canadian Climate Institute, said in 2023 he hopes to see more provincial regulators and governments send “strong signals to the utilities” that a pathway to net-zero is realistic.

He recounted increasing talk from investors in facilities such as automotive plants and steel mills who want clean electricity guarantees before making investments. “Clean energy is a comparative advantage,” he said, which puts the imperative on organizations like the IESO to lay out plans for bigger, cleaner and flexible grids.

Beguin and Pivnick said they are watching British Columbia closely because of a government mandate letter setting a climate-aligned energy framework and a new mandate for the British Columbia Utilities Commission. Pivnick said there may be lessons to be drawn for other jurisdictions.

Alberta’s unlikely rise as a clean energy leader
Though Alberta sits at the heart of Canada’s oil and gas industry and at the core of political resistance to climate policy, it has emerged as a front runner in renewables adoption.

Billion of dollars for wind and solar projects have flowed into Alberta, as the province charts a path to clean electricity with large-scale projects.

Pivnick said an “underappreciated story” is how Alberta leaned into renewables through its “unique market.” Alberta leads in renewables and power purchase agreements because of its deregulated electricity market.

Unlike most provinces, Alberta enables companies to go directly to solar and wind developers to strike deals, a model reinforced under Kenney's electricity policies in recent years, rather than through utilities. It incentivizes private investment, lowers costs and helps meet increasing demand, which Nagwan Al-Guneid, the director of the Business Renewables Centre - Canada at the Pembina Institute, said is “is the No. 1 reason we see this boom in renewables in Alberta.”

Beguin noted Alberta’s innovative ‘reverse auctions,’ where the province sets a competitive bidding process to provide electricity. It ended up making electricity “way cheaper” due to the economic competitiveness of renewables, while Alberta profited and added clean energy to its grid.

In 2019, the Business Renewables Centre-Canada established a target of 2 GW of renewable energy deals by 2025. The target was exceeded in 2022, which led to a revised goal for 10 GW of renewables by 2030.

Al-Guneid wants to see other jurisdictions help more companies buy renewables. She does not universally prescribe deregulation, however, as other mechanisms such as sleeving exist.

Alberta will update its industrial carbon pricing in 2023, requiring large emitters to pay $65 per tonne of carbon dioxide. The fee climbs $15 per tonne each year until it reaches $175 per tonne in 2030. Al-Guneid said as the tax increases, demand for renewable energy certificates will also increase in Alberta.

Pivnick noted Alberta will have an election in 2023, which could have ramifications for energy policy.

Batteries and EV leadership
Manufacturing clean energy equipment, batteries and storage requires enormous quantities of minerals. With the 2022 Fall Economic Statement and the Critical Minerals Strategy, Canada is taking important steps to lead on this front.

Pivnick pointed to battery supply chain investments in Ontario and Quebec as part of Canada’s shift from “a fuel-based (economy) to a materials-based economy” to provide materials necessary for wind turbines and solar panels. The Strategy showed an understanding Canada has a major role to meet its allies’ needs for critical minerals, whether it’s the resources or supply chains.

There is also an opportunity for Canada to forge ahead on energy storage. The Fall Economic Statement proposes a 30 per cent tax credit for investments into energy storage. Pivnick suggested Canada invest further into research and development to explore innovations like green hydrogen and pump storage.

Doig believes Canada is “well poised” for batteries, both in terms of the technology and sustainable mining of minerals like cobalt, lithium and copper. He is bullish for Canada’s electrification based on its clean energy use and increased spending on renewables and energy storage.

He said the federal ZEV mandate will drive increased demand for the power, utilities, and oil and gas industries to respond.

The majority of gas stations, which are owned by the nation’s energy industry, will need to be converted into EV charging stations.

Offsetting a recession 
One challenge will be a poor economic forecast in the near term. A short "technical recession" is expected in 2023.

Inflation remains stubbornly high, which has forced the Bank of Canada to hike interest rates. The conditions will not leave any industry unscathed, but Doig said Canada's decarbonization is unlikely to be halted.

“Whilst a recession would slow things down, the concern around energy security definitely helps offset that concern,” he said.

Amid rising trade frictions and tariff threats, energy security is top of mind for governments and private organizations, accelerating the shift to renewables.

Doig said there is a general feeling a recession would be short-lived, meaning it would be unlikely to impact long-term projects in hydrogen, liquified natural gas, carbon capture and wind and solar.

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Inflation Reduction Act Energy Credits help households electrify with tax credits and rebates for heat pumps, EVs, rooftop solar, battery storage, and efficiency upgrades, cutting utility bills, reducing carbon emissions, and accelerating home electrification nationwide.

Key Points

Federal incentives offering tax credits and rebates for heat pumps, EVs, solar, and efficiency to cut emissions.

✅ 30% rooftop solar and storage credit; $2,000 annual cap for heat pumps

✅ Up to $7,500 EV tax credit; price, income, and assembly rules apply

✅ Low-income rebates and discounts available via states starting mid-2023

Earlier this year, Congress passed the biggest climate bill in history — cloaked under the name the “Inflation Reduction Act,” a historic climate deal by any measure.

Starting in the new year, the bill will offer households thousands of dollars to transition over from fossil-fuel burning heaters, stoves and cars to cleaner versions as renewable electricity accelerates. On Jan. 1, middle-income households will be able to access over a half-dozen tax credits for electric stoves, cars, rooftop solar and more. And starting sometime in mid-2023, lower-income households will be able to get upfront discounts on some of those same appliances — without having to wait to file their taxes to get the cash back. This handy online tool shows what you might be eligible for, depending on your Zip code and income.

But which credits should Americans focus on — and which are best for the climate? Here’s a guide to the top climate-friendly benefits of the Inflation Reduction Act, and how to access them.

Heat pumps — the best choice for decarbonizing at home

Tax credit available on Jan. 1: 30 percent of the cost, up to $2,000

Income limit: None

Ah, heat pumps — one of the most popular technologies of the transition to clean energy and to net-zero electricity systems. “Heat pump” is a bit of a misnomer for these machines, which are more like super-efficient combo air conditioning and heating systems. These appliances run on electricity and move heat, instead of creating it, and so can be three to five times more efficient than traditional gas or electrical resistance heaters.

“For a lot of people, a heat pump is going to be their biggest personal impact,” said Sage Briscoe, the federal senior policy manager at Rewiring America, a clean-energy think tank. (Heat pumps have become so iconic that Rewiring America even has a heat pump mascot.)

Heat pumps can have enormous cost and carbon savings. According to one analysis using data from the National Renewable Energy Laboratory, switching to a heat pump can save homeowners anywhere from $100 to $1,200 per year on heating bills and prevent anywhere from 1 to 8 metric tons of carbon dioxide emissions per year. For comparison, going vegan for an entire year saves about 1 metric ton of CO2 emissions.

But many consumers encounter obstacles when switching over to heat pumps. In some areas, it can be difficult to find a contractor trained and willing to install them; some homeowners report that contractors share misinformation about heat pumps, including that they don’t work in cold climates. (Modern heat pumps do work in cold climates, and can heat a home even when outdoor temperatures are down to minus-31 degrees Fahrenheit.) Briscoe recommends that homeowners look for skilled contractors who know about heat pumps and do advance research to figure out which models might work best for their home.

Electric vehicles — top choice for cutting car emissions

Tax credit available on Jan. 1: Up to $7,500 depending on the make and model of the car

Income limit: <$150,000 for single filers; <$300,000 for joint filers

If you are like the millions of Americans who don’t live in a community with ample public transit, the best way to decarbonize your transport, as New Zealand's electricity transition shows, is switching to an electric car. But electric cars can be prohibitively expensive for many Americans.

Starting Jan. 1, a new EV tax credit will offer consumers up to $7,500 off the purchase of an electric vehicle. For the first few months, Americans will get somewhere between $3,751 and $7,500 off their purchase of an EV, depending on the size of the battery in the car.

There are limitations, per the new law. The vehicles will also have to be assembled in North America, where Canada's electricity progress is notable, and cars that cost more than $55,000 aren’t eligible, nor are vans or trucks that cost more than $80,000. This week, the Internal Revenue Service provided a list of vehicles that are expected to meet the criteria starting Jan. 1.

Beginning about March, however, that $7,500 credit will be split into two parts: Consumers can get a $3,750 credit if the vehicle has a battery containing at least 40 percent critical minerals from the United States (or a country that the United States has a free-trade agreement with) and another $3,750 credit if at least 50 percent of the battery’s components were assembled and manufactured in North America. Those rules haven’t been finalized yet, so the tax credit starting on Jan. 1 is a stopgap measure until the White House has ironed out the final version.

Joe Britton, the executive director of the EV industry group Zeta, said that means there will likely be a wider group of vehicles eligible for the full tax credit in January and February than there will be later in 2023. Because of this, he recommended that potential EV owners act fast in 2023.

“I would be buying a car in the first quarter,” he said.

Rooftop solar — the best choice for generating clean energy

Tax credit available now: 30 percent of the cost of installation, no cap

Income limit: None

For those who want to generate their own clean energy, there is always rooftop solar panels. This tax credit has actually been available since the Inflation Reduction Act was signed into law in August 2022. It offers a tax credit equal to 30 percent of the cost of installing rooftop solar, with no cap. According to Rewiring America, the average 6 kilowatt solar installation costs about $19,000, making the average solar tax credit about $5,700. (The Inflation Reduction Act also includes a 30 percent tax credit for homeowners that need to upgrade their electricity panel for rooftop solar, and a 30 percent tax credit for installing battery storage to support the shift toward carbon-free electricity solutions.)

Solar panels can save homeowners tens of thousands of dollars in utility bills as extreme heat boosts electricity bills and, when combined with battery storage, can also provide a power backup in the case of a blackout or other disaster. For someone trying to move their entire home away from fossil fuels, solar panels become even more enticing: Switch everything over to electricity, and then make the electricity super cheap with the help from the sun.

For people who don’t own their own homes, there are other options as well. Renters can subscribe to a community solar project to lower their electricity bills and get indirect benefits from the tax credits.

Tips, tricks and words of caution
There are many other credits also coming out in 2023: for EV chargers (up to $1,000), a boon for expanding carbon-free electricity across the grid, heat pump water heaters (up to $2,000), and even cash for sealing up the doors and windows of your home (up to $1,200).

The most important thing to know, Briscoe said, is whether you qualify for the upfront discounts for low- and moderate-income Americans — which won’t be available until later in 2023 — or the tax credits, which will be available Jan. 1. (Try this tool.) If going the tax credit route, it’s better to spread the upgrades out across multiple years, since there is an annual limit on how many of the credits you can claim in a given year. And, she warned, it is not always going to be easy: It can be hard to find the right installers and the right information for how to make use of all the available government resources.

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Sicily Green Hydrogen accelerates decarbonization via renewable energy, wind farm electrolysis, hydrogen storage, and distribution from Enel Green Power and Sapio at the NextHy industrial lab in Carlentini and Sortino Sicily hub.

Key Points

Sicily Green Hydrogen is an Enel-Sapio plan to produce hydrogen via wind electrolysis for industrial decarbonization.

✅ 4 MW electrolyzer powered by Carlentini wind farm

✅ Estimated 200+ tons annual green H2 production capacity

✅ Market distribution managed by Sapio across Sicily

This green hydrogen will be produced at the Sicilian industrial plant, an innovative hub that puts technology at the service of the energy transition, echoing hydrogen innovation funds that support similar goals worldwide

Activating a supply of green hydrogen produced using renewable energy from the Carlentini wind farm in eastern Sicily is the focus of the agreement signed by Enel Green Power and Sapio. The agreement provides for the sale to Sapio of the green hydrogen that will be produced, stored in clean energy storage facilities and made available from 2023 at the Carlentini and Sortino production sites, home to Enel Green Powers futuristic NextHy innitiative. Sapio will be responsible for developing the market and handling the distribution of renewable hydrogen to the end customer.

In contexts where electrification is not easily achievable, green hydrogen is the key solution for decarbonization as it is emission-free and offers a potential future for power companies alongside promising development prospects, commented Salvatore Bernabei, CEO of Enel Green Power. For this reason we are excited about the agreement with Sapio. It is an agreement that looks to the future by combining technological innovation and sustainable production.

Sapio is strongly committed to contributing to the EUs achievement of the UN SDGs, commented Alberto Dossi, President of the Sapio Group, and with this project we are taking a firm step towards sustainable development in our country. The agreement with EGP also gives us the opportunity to integrate green hydrogen into our business model, as jurisdictions propose hydrogen-friendly electricity rates to grow the hydrogen economy, which is based on our strong technological expertise in hydrogen and its distribution over 100 years in business. In this way we will also be able to give further support to the industrial activities we are already carrying out in Sicily.

The estimated 200+ tons of production capacity of the Sicilian hub is the subject of the annual supply foreseen in the agreement. Once fully operational, the green hydrogen will be produced mainly by a 4 MW electrolyzer, which is powered exclusively by the renewable energy of the existing wind farm, and to a lesser extent by the state-of-the-art electrolysis systems tested in the platform. Launched by Enel Green Power in September 2021, NextHys Hydrogen Industrial Lab is a unique example of an industrial laboratory in which production activity is constantly accompanied by technological research. In addition to the sectors reserved for full-scale production, there are also areas dedicated to testing new electrolyzers, components such as valves and compressors, and innovative storage solutions based on liquid and solid means of storage: in line with Enels open-ended approach, this activity will be open to the collaboration of more than 25 entities including partners, stakeholders and innovative startups. The entire complex is currently undergoing an environmental impact assessment at the Sicily Regions Department of Land and Environment.

It is an ambitious project with a sustainable energy source at its heart that will be developed at every link in the chain: thanks to the agreement with Sapio, in fact, at NextHy green hydrogen will now not only be produced, stored and moved on an industrial scale, but also purchased and used by companies that have understood that green hydrogen is the solution for decarbonizing their production processes. In this context, this experimental approach that is open to external contributions will allow the Enel Green Power laboratory team to test the project on an industrial scale, so as to create the best conditions for a commercial environment that can make the most of all present and future technologies for the generation, storage and transport of green hydrogen, including green hydrogen microgrids that demonstrate scalable integration. It is an initiative consistent with Enels Open Innovability spirit: meeting the challenges of the energy transition by focusing on innovation, ideas and their transformation into reality.

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France EV Bonus Eligibility Rules prioritize lifecycle carbon footprint, manufacturing emissions, battery sourcing, and transport impacts, reshaping electric car incentives and excluding many China-made EVs while aiming for WTO-compliant, low-emission industrial policy.

Key Points

France's EV bonus rules score lifecycle emissions to favor low-carbon models and limit incentives for China-made EVs.

✅ Scores energy, assembly, transport, and battery criteria

✅ Likely excludes China-made EVs with coal-heavy production

✅ Aims to align incentives with WTO-compliant climate goals

France has published new eligibility rules for electric car incentives to exclude EVs made in China, even though carmakers in Europe do not have more affordable rival models on the French market.

WHY IS FRANCE REVISING ITS EV BONUS ELIGIBILITY RULES?
The French government currently offers buyers a cash incentive of between 5,000 and 7,000 euros in cash for eligible models to get more electric cars on the road, at a total cost of 1 billion euros ($1.07 billion) per year.

However, in the absence of cheap European-made EVs, a third of all incentives are going to consumers buying EVs made in China, a French finance ministry source said. The trend has helped spur a Chinese EV push into Europe and a growing competitive gap with domestic producers.

The scheme will be revamped from Dec. 15 to take into account the carbon emitted in a model's manufacturing process.

President Emmanuel Macron and government ministers have made little secret that they want to make sure French state cash is not benefiting Chinese carmakers.

WHAT DO THE NEW RULES DO?
Under the new rules, car models will be scored against government-set thresholds for the amount of energy used to make their materials, in their assembly and transport to market, as well as what type of battery the vehicle has.

Because Chinese industry generally relies heavily on coal-generated electricity, the criteria are likely to put the bonus out of Chinese carmakers' reach.

The government, which is to publish in December the names of models meeting the new standards, says that the criteria are compliant with WTO rules because exemptions are allowed for health and environmental reasons, and similar Canada EV sales regulations are advancing as well.

WILL IT DO ANYTHING?
With Chinese cars estimated to cost 20% less than European-made competitors, the bonus could make a difference for vehicles with a price tag of less than 25,000 euros, amid an accelerating global transition to EVs that is reshaping price expectations.

But French car buyers will have to wait because Stellantis' (STLAM.MI) Slovakia-made e-C3 city car and Renault's (RENA.PA) France-made R5 are not due to hit the market until 2024.

Nonetheless, many EVs made in China will remain competitive even without the cash incentive, reflecting projections that within a decade many drivers could be in EVs.

With a starting price of 30,000 euros, SAIC group's (600104.SS) MG4 will be less expensive than Renault's equivalent Megane compact car, which starts at 38,000 euros - or 33,000 euros with a 5,000-euro incentive.

Since its 46,000-euro starting price is just below the 47,000-euro price threshold for the bonus, Tesla's (TSLA.O) Y model - one of the best selling electric vehicles in France - could in theory also be impacted by the new rules for vehicles made in China.

S&P Global Mobility analyst Lorraine Morard said that even if most Chinese cars are ineligible for the bonus they would probably get 7-8% of France's electric car market next year, even as the EU's EV share continues to rise, instead of 10% otherwise.

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EV Carpocalypse signals potential mismatch between electric vehicle production and demand, as charging infrastructure, utility coordination, and plug-in hybrid strategies lag forecasts, while state mandates and market-share plays drive cautious, data-informed scaling.

Key Points

EV Carpocalypse describes overbuilt EV supply versus demand amid charging rollout, mandates, and risk-managed scaling.

✅ Forecasts vs actual EV demand may diverge in near term

✅ Charging infrastructure and utilities lag vehicle output

✅ Mandates and PHEVs cushion adoption while data guides scaling

According to Forbes contributor David Kiley, and Wards Automotive columnist John McElroy, there may be an impending “carpocalypse” of electric vehicles on the way. Sounds very damning and it’s certainly not the upbeat tone I’ve taken on nearly every piece of EV demand content I’ve authored but the author, Kiley does bring up some interesting points worth considering. EV Adoption is happening, and it’s certainly doing so at ever faster rates as the market nears an EV inflection point today. The infrastructure (charging stations, utility cooperation) is being built out more slowly than vehicle manufacturers are producing cars but, as the GM president on EV hurdles has noted, the issue seems to be just that, maybe even the short and medium term plans for EV manufacturing are too aggressive.

#google#

With new EV and plug-in hybrid vehicle sales representing a mere .6% of new car cales in the US, a sign that EV sales remain behind gas cars even as new models proliferate, car makers are are going to be spending more than $100 billion to come out with more than a hundred models of battery electric vheicles which also includes PHEVs and the fear is these vehicles aren’t going to sell in the numbers that automakers and industry analysts may have expected. But forecasts are just that, forecasts, even as U.S. EV sales surge into 2024 suggest momentum. So there’s a valid argument to be made that they’ll either overshoot the true mark or come in way below the actual amount. With nine U.S. states mandating that 15% of new cars sold be EVs by 2025, you could say that at least automakers have supporters in state government helping to push the new technology into the hands of more drivers.

Still, it’s anyone’s guess as to what true adoption will be, and a brief Q1 2024 market share dip underscores lingering volatility. The use of big data and just in time manufacturing will ensure that manufacturers will miss the mark on EVs by less than they have in the past, and will able to cope with breaking even on these vehicles for the sake of gobbling up precious early stage market share. After all, many vendors have up to this point been very willing to break even or make a loss on their lease-only EVs or on EV or hybrid financing in order to gain that share and build out their brand awareness and technical prowess. With some stops and starts, demand will meet supply or supply may need to meet demand but either way, the EV adoption wave is coming to a driveway near you. 

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U.S. Renewable Energy Record 28% signals a cleaner power grid as wind, solar, and hydroelectric output soar; EIA data shows cost-competitive clean energy reshaping the electricity mix and reducing carbon emissions across regions.

Key Points

EIA-reported April share of electricity from wind, solar, and hydro, reflecting cost-driven growth in U.S. clean power.

✅ Wind, solar additions dominated recent U.S. capacity buildouts

✅ Lower levelized costs make renewables most competitive

✅ Seasonal factors and outages lowered fossil and nuclear output

The amount of electricity generated by renewable resources hit a record 28% in April, a breakthrough number that shows how important renewable energy has become in U.S. energy markets as it surpassed coal in 2022 overall.

"It's a 'Wow' moment," said Peter Kelly-Detwiler, an energy analyst and author of "The Energy Switch," a recent book about the transition to a carbon-free energy economy.

The percentage of U.S. electricity produced by renewable energy from wind, solar and hydroelectric dams has been steadily rising, from 8.6% in April 2001 to this April's 28%. Those numbers were released this week by the U.S. Energy Information Administration, which tracks energy data for the nation.

What explains the surge?
There are several reasons. At the top is that wind and solar installations dominated U.S. energy buildouts.

"Basically, the only things we've added to the grid in the past decade are wind, solar and natural gas," said Harrison Fell, an economist and engineer at Columbia University, where he co-leads the Power Sector and Renewables Research Initiative.

That's happening for two reasons. The first is cost. Renewables are simply the most economically competitive power currently available, Kelly-Detwiler said.

In 2021, the cost of producing a megawatt-hour of electricity from a new wind turbine was $26 to $50. The same amount of electricity from the cheapest type of natural gas plant ranged from $45 to $74, according to Lazard, a financial advisory firm that publishes annual estimates of the cost of producing electricity. 

Federal and state mandates and incentives to increase the amount of clean energy used also help, Fell said, as renewables reached 25.5% of U.S. electricity recently. 

"When you do the math on what's the most profitable thing to add, it's often going to be wind and solar at this stage," he said.

Was weather a factor?
Yes. April tends to be a particularly windy month, and this spring was windier than most, Fell said.

There's also less power coming into the grid from fossil fuels and nuclear in the spring. That's because electricity demand is generally lower because of the mild weather and fossil fuel and nuclear power plants use the time for maintenance and refueling, which reduces their production, he said.

Another surprise was that in April, wind and solar power together produced more electricity than nuclear plants nationwide. 

Historically, nuclear power plants, which are carbon-neutral, have reliably produced about 20% of America's electricity. In April that number dropped to 18% while wind and solar combined stood at 19.6%.

The nuclear decrease is partly a result of the shutdown of two plants in the past year, Indian Point in New York state and Palisades in Michigan, as well as scheduled closures for maintenance.

Will the trend continue?
When all U.S. carbon-neutral energy sources are added together – nuclear, wind, hydroelectric and solar – almost 46% of U.S. electricity in April came from sources that don't contribute greenhouse gases to the environment, federal data shows.  

"It's a milestone," Kelly-Detwiler said. "But in a few years, we'll look back and say, 'This was a nice steppingstone to the next 'Wow!' moment."

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