Electrification
How Much Land is Needed to Power the U.S. with Solar?
How Much Land is Needed to Power the U.S. with Solar?
The Biden administration has set a goal of reaching 100% clean electricity throughout the U.S. by 2035, and solar power is a key for this American energy transition.
In the last decade alone, solar has experienced an average annual growth rate of 42% in the U.S. thanks to federal tax credits, declining costs, and increasing demand. It is projected that more than one in seven American homes will have a solar power system by 2030.
To put this trend into perspective, this graphic uses data from the United States Department of Energy to see how much land would be needed to power the entire country with solar panels.
Solar Panels Across the Ocean State
The U.S. has 102.9 gigawatts of total solar installed capacity which is equivalent to 965 square miles, roughly the size of the country’s smallest state, Rhode Island. This current solar capacity generates enough electricity to power 18.6 million American homes, which is nearly 13% of the nation’s households.
According to a report from the National Renewable Energy Laboratory, roughly 22,000 square miles of solar panel-filled land (about the size of Lake Michigan) would be required to power the entire country, including all 141 million households and businesses, based on 13-14% efficiency for solar modules.
Many solar panels, however, reach 20% efficiency, which could reduce the necessary area to just about 10,000 square miles, equivalent to the size of Lake Erie.
Solar Installations Spreading Across the States
Today, solar represents only 3% of the total U.S. electrical generation.
While California has traditionally dominated the market, other states like Florida and Texas are expanding rapidly, boosted by the residential market.
Large companies with clean energy goals such as Walmart, Apple, Target and Amazon have also helped push solar adoption to near-record levels in 2021.
Despite having a high installation cost, the technology tends to bring savings in the long term. An average-sized residential system has dropped from a price of $40,000 in 2010 to roughly $20,000 in 2020. Along with this, solar panels can save between $10,000-$30,000 over a 30-year lifetime.
Between land and rooftops, the United States has more than enough space to build all the solar panels necessary to power the country. Until then, the future of clean electricity will also depend on hydro, nuclear, geothermal, and wind energy.
Electrification
How Clean is the Nickel and Lithium in a Battery?
This graphic from Wood Mackenzie shows how nickel and lithium mining can significantly impact the environment, depending on the processes used.

How Clean is the Nickel and Lithium in a Battery?
The production of lithium (Li) and nickel (Ni), two key raw materials for batteries, can produce vastly different emissions profiles.
This graphic from Wood Mackenzie shows how nickel and lithium mining can significantly impact the environment, depending on the processes used for extraction.
Nickel Emissions Per Extraction Process
Nickel is a crucial metal in modern infrastructure and technology, with major uses in stainless steel and alloys. Nickel’s electrical conductivity also makes it ideal for facilitating current flow within battery cells.
Today, there are two major methods of nickel mining:
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From laterite deposits, which are predominantly found in tropical regions. This involves open-pit mining, where large amounts of soil and overburden need to be removed to access the nickel-rich ore.
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From sulphide ores, which involves underground or open-pit mining of ore deposits containing nickel sulphide minerals.
Although nickel laterites make up 70% of the world’s nickel reserves, magmatic sulphide deposits produced 60% of the world’s nickel over the last 60 years.
Compared to laterite extraction, sulphide mining typically emits fewer tonnes of CO2 per tonne of nickel equivalent as it involves less soil disturbance and has a smaller physical footprint:
Ore Type | Process | Product | Tonnes of CO2 per tonne of Ni equivalent |
---|---|---|---|
Sulphides | Electric / Flash Smelting | Refined Ni / Matte | 6 |
Laterite | High Pressure Acid Leach (HPAL) | Refined Ni / Mixed Sulpide Precipitate / Mixed Hydroxide Precipitate | 13.7 |
Laterite | Blast Furnace / RKEF | Nickel Pig Iron / Matte | 45.1 |
Nickel extraction from laterites can impose significant environmental impacts, such as deforestation, habitat destruction, and soil erosion.
Additionally, laterite ores often contain high levels of moisture, requiring energy-intensive drying processes to prepare them for further extraction. After extraction, the smelting of laterites requires a significant amount of energy, which is largely sourced from fossil fuels.
Although sulphide mining is cleaner, it poses other environmental challenges. The extraction and processing of sulphide ores can release sulphur compounds and heavy metals into the environment, potentially leading to acid mine drainage and contamination of water sources if not managed properly.
In addition, nickel sulphides are typically more expensive to mine due to their hard rock nature.
Lithium Emissions Per Extraction Process
Lithium is the major ingredient in rechargeable batteries found in phones, hybrid cars, electric bikes, and grid-scale storage systems.
Today, there are two major methods of lithium extraction:
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From brine, pumping lithium-rich brine from underground aquifers into evaporation ponds, where solar energy evaporates the water and concentrates the lithium content. The concentrated brine is then further processed to extract lithium carbonate or hydroxide.
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Hard rock mining, or extracting lithium from mineral ores (primarily spodumene) found in pegmatite deposits. Australia, the world’s leading producer of lithium (46.9%), extracts lithium directly from hard rock.
Brine extraction is typically employed in countries with salt flats, such as Chile, Argentina, and China. It is generally considered a lower-cost method, but it can have environmental impacts such as water usage, potential contamination of local water sources, and alteration of ecosystems.
The process, however, emits fewer tonnes of CO2 per tonne of lithium-carbonate-equivalent (LCE) than mining:
Source | Ore Type | Process | Tonnes of CO2 per tonne of LCE |
---|---|---|---|
Mineral | Spodumene | Mine | 9 |
Mineral | Petalite, lepidolite and others | Mine | 8 |
Brine | N/A | Extraction/Evaporation | 3 |
Mining involves drilling, blasting, and crushing the ore, followed by flotation to separate lithium-bearing minerals from other minerals. This type of extraction can have environmental impacts such as land disturbance, energy consumption, and the generation of waste rock and tailings.
Sustainable Production of Lithium and Nickel
Environmentally responsible practices in the extraction and processing of nickel and lithium are essential to ensure the sustainability of the battery supply chain.
This includes implementing stringent environmental regulations, promoting energy efficiency, reducing water consumption, and exploring cleaner technologies. Continued research and development efforts focused on improving extraction methods and minimizing environmental impacts are crucial.
Sign up to Wood Mackenzie’s Inside Track to learn more about the impact of an accelerated energy transition on mining and metals.
Electrification
Life Cycle Emissions: EVs vs. Combustion Engine Vehicles
We look at carbon emissions of electric, hybrid, and combustion engine vehicles through an analysis of their life cycle emissions.

Life Cycle Emissions: EVs vs. Combustion Engine Vehicles
According to the International Energy Agency, the transportation sector is more reliant on fossil fuels than any other sector in the economy. In 2021, it accounted for 37% of all CO2 emissions from end‐use sectors.
To gain insights into how different vehicle types contribute to these emissions, the above graphic visualizes the life cycle emissions of battery electric, hybrid, and internal combustion engine (ICE) vehicles using Polestar and Rivian’s Pathway Report.
Production to Disposal: Emissions at Each Stage
Life cycle emissions are the total amount of greenhouse gases emitted throughout a product’s existence, including its production, use, and disposal.
To compare these emissions effectively, a standardized unit called metric tons of CO2 equivalent (tCO2e) is used, which accounts for different types of greenhouse gases and their global warming potential.
Here is an overview of the 2021 life cycle emissions of medium-sized electric, hybrid and ICE vehicles in each stage of their life cycles, using tCO2e. These numbers consider a use phase of 16 years and a distance of 240,000 km.
Battery electric vehicle | Hybrid electric vehicle | Internal combustion engine vehicle | ||
---|---|---|---|---|
Production emissions (tCO2e) | Battery manufacturing | 5 | 1 | 0 |
Vehicle manufacturing | 9 | 9 | 10 | |
Use phase emissions (tCO2e) | Fuel/electricity production | 26 | 12 | 13 |
Tailpipe emissions | 0 | 24 | 32 | |
Maintenance | 1 | 2 | 2 | |
Post consumer emissions (tCO2e) | End-of-life | -2 | -1 | -1 |
TOTAL | 39 tCO2e | 47 tCO2e | 55 tCO2e |
While it may not be surprising that battery electric vehicles (BEVs) have the lowest life cycle emissions of the three vehicle segments, we can also take some other insights from the data that may not be as obvious at first.
- The production emissions for BEVs are approximately 40% higher than those of hybrid and ICE vehicles. According to a McKinsey & Company study, this high emission intensity can be attributed to the extraction and refining of raw materials like lithium, cobalt, and nickel that are needed for batteries, as well as the energy-intensive manufacturing process of BEVs.
- Electricity production is by far the most emission-intensive stage in a BEVs life cycle. Decarbonizing the electricity sector by implementing renewable and nuclear energy sources can significantly reduce these vehicles’ use phase emissions.
- By recycling materials and components in their end-of-life stages, all vehicle segments can offset a portion of their earlier life cycle emissions.
Accelerating the Transition to Electric Mobility
As we move toward a carbon-neutral economy, battery electric vehicles can play an important role in reducing global CO2 emissions.
Despite their lack of tailpipe emissions, however, it’s good to note that many stages of a BEV’s life cycle are still quite emission-intensive, specifically when it comes to manufacturing and electricity production.
Advancing the sustainability of battery production and fostering the adoption of clean energy sources can, therefore, aid in lowering the emissions of BEVs even further, leading to increased environmental stewardship in the transportation sector.
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