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

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"

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).

"The Investment Case for Solar" Presentation

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Solar Research Reports

Solar stocks see support as global solar demand remains very strong

The MAC Global Solar Energy Stock Index so far in 2023 is unchanged on a year-to-date basis. The MAC Solar Index saw extraordinary gains of +67% in 2019 and +245% in 2020, but then settled back by -26% in 2021 and -5% in 2022. The MAC Solar Index is the tracking index for the U.S.-based…

Index Announcements

MAC Solar Index Methodology Change Announcement

Addition of New Business Involvement Screen and Changes to the Governance Score Screen — S&P DJI Netherlands B.V., a wholly owned subsidiary of S&P Dow Jones Indices LLC, (“S&P Dow Jones Indices” or “S&P DJI”), and the benchmark administrator for the MAC Global Solar Index, on April 27, 2023, announced the results of a public…

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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.


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