The fund tracks the MAC Global Solar Energy Index and gives priority to "pure-play" solar companies that earn a significant share of their revenue from solar operations. Beyond the US, it holds major solar companies in Europe, Asia, and around the world, weighted by market capitalization.

It suits investors who expect to benefit from the renewable energy transition and carbon neutrality policies, and who want to focus on the long-term growth potential of the solar sector despite high volatility.

Launched by Invesco in 2008, it is a passively managed (index-tracking) ETF.

The fund covers the entire solar industry ecosystem, from the manufacture of solar power equipment to installation and operation. It weights companies with a higher share of solar business more heavily to maintain sector purity, and it aims to include a balanced mix of major players in the global market.

• A flagship ETF specialized in the solar sector
• Broad exposure across the entire global solar value chain

Assets under management (AUM) stand at $877.8M, and the expense ratio is 0.70% per year.

Compared with other technology and infrastructure theme ETFs shown in the table, such as GRID, BOTZ, and ROBT, TAN focuses purely on solar as an energy source, so it tends to react sensitively to changes in the sector's business conditions.

The fund shows volatility in line with governments' clean energy subsidy policies and the push for stronger energy security. Recently, it has moved in close sensitivity to the interest rate environment and to solar panel price trends.

Amid the major paradigm shift of the energy transition, long-term capital inflows are expected, but because of the sector's characteristically high volatility, short-term inflows and outflows are also quite active.

It is an efficient vehicle for fully capturing the growth of the solar industry, but high volatility and dependence on policy are risk factors.

In the table, GRID focuses on smart grid infrastructure and BOTZ on robotics, while TAN specializes in solar. If you want to include other renewable energy sources such as wind in addition to solar, ICLN or PBW are good alternatives, and if you want to focus only on wind, adding FAN to your portfolio is also worth considering.

This is a key checklist to review before deciding to invest in TAN. You should closely consider both the solar industry's business cycle and the global macroeconomic environment.

The solar sector sees very rapid technological innovation and fierce global competition, so there is a constant risk of principal loss from the decline of individual companies or abrupt restructuring of the industry.

It is a standard way to invest in the era's shift toward renewable energy. It is recommended as a strategic portfolio asset for aggressive investors who can tolerate high volatility.