MAC Global Solar Energy Stock Index

Invest in the dynamic global solar energy industry

The "MAC Global Solar Energy Stock Index" (ticker symbol: SUNIDX) is the tracking Index for the "Invesco Solar ETF," which is an exchange-traded fund (ETF) that is traded on the New York Stock Exchange ARCA with the ticker symbol of TAN (NYSE ARCA: TAN).* For more information on the Invesco Solar ETF (TAN), visit Invesco.com.

Investors cannot invest directly in an index but investors can buy and sell the exchange-traded fund (ETF) that tracks that index. For more information on how ETFs work, see Investopedia's "ETF Explanation." An ETF holds a basket of stocks in a single fund. An ETF can be bought and sold in an investor's brokerage account just like an individual stock (consult with your investment advisor).

The MAC Solar Index is calculated and administered by S&P Dow Jones Indices.*

Note:  For European-based investors, click here for information on the European-based “Invesco Solar Energy UCITS ETF"

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Why Invest in Solar?

  • King of Electricity" – The International Energy Agency (IEA) called solar the new "King of Electricity" in its flagship World Energy Outlook Report. Solar spending will be a massive $4.2 trillion through 2050, with solar representing 35% of all new global electricity generation installs, according to Bloomberg New Energy Finance (BNEF).
  • Cheapest electricity solution – Solar is now the cheapest source of new utility-scale electricity capacity in the U.S., according to the investment bank Lazard, beating coal, natural gas, and nuclear due to the 85% plunge in solar costs since 2010.
  • Safety, Security, and Independence - “Whenever there’s a huge spill of solar energy, it’s just called a nice day.” Solar means no nuclear leaks; no nuclear waste; no fossil fuel pollution in the air, water or ground; no being held hostage by hostile oil countries; no oil wars. Just a clean, cheap, and limitless source of electricity located within our borders.
  • Tailwind from government policy support – Solar has a strong tailwind from government policy support across the globe, adding to solar's attractive economics, even though solar no longer needs any subsidies or mandates to compete.
  • Zero-carbon energy solution – Solar is a key solution for the world's zero-carbon energy needs with free fuel (sunlight) and zero CO2/pollution emissions, and flexibility to provide electricity directly to utilities and businesses/homeowners.
  • Robust 24/7 solution with solar-plus-storage – Delivering 24/7 electricity, solar-plus-battery-storage systems are already cost-effective and will become even more so as battery costs plunge by another 52% through 2030 (BNEF).

Infographic: "Solar Is Winning"

Slide 1 of 4

Solar PV is one of the world’s highest-growth industries with 32% average annual growth since 2010

Source: International Energy Agency (IEA), World Energy Outlook 2023.

Slide 2 of 4

Solar already costs less to install than nuclear, coal, or natural gas, making it both an ideal environmental and economic solution

Source: Lazard LCOE, version 16.0, April 2023

Slide 3 of 4

Solar is winning the lion’s share of new U.S. electricity installs, beating wind 2-to-1 and natural gas 3-to-1

Source: "Solar Market Insight Report 2022 Year in Review," Solar Energy Industry Assn, 3/9/2023

Slide 4 of 4

Solar will become the world’s largest source of electricity generation by 2034, beating all other sources, says International Energy Agency (IEA)

Source: International Energy Agency (IEA), World Energy Outlook 2023 (Stated Policies Scenario)

Solar Research Reports

Solar stocks rally to 15-month high as US solar industry absorbs new policy landscape and China moves forward on curbing excess production

The MAC Global Solar Energy Index is up +30% year-to-date and has soared by +68% from April’s 5-year low. The MAC Solar Index experienced extraordinary gains of +67% in 2019 and +245% in 2020, but then fell back by -26% in 2021, -5% in 2022, -26% in 2023, and -37% in 2024. The MAC Solar…
READ ALL REPORTS

Index Announcements

MAC Solar Index December 2025 Quarterly Review Changes

As a result of the regular quarterly Index review process that takes effect after the close of business on Friday, December 19, 2025, there will be no adds or drops of stocks from the Index.
READ ALL ANNOUNCEMENTS

MAC Global Solar Energy Index Total Return (SUNIDX)


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Advantages of investing in a solar stock fund versus individual solar stocks

Own the global solar sector in one trade

Qualified solar stocks on developed global exchanges are included in the MAC Solar Index.

Longest track record in the industry

The MAC Solar Index was the first solar index for the exchange-traded fund industry with an inception date of March 31, 2008.

Dynamic portfolio

Quarterly index reviews ensure that new and emerging solar companies are added to the index when they meet the index criteria.

Diversification

Reduce exposure to event/financial risk at individual solar companies with index diversification across geography, solar technologies, and solar value chain.