Too Much Solar Could Be Good for Inverter Companies

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2009 is likely to be a watershed year for the solar photovoltaic (PV) industry, and one which many PV manufacturers will not survive.  Even before the credit crunch and plummeting housing market made capital intensive PV much harder to finance, the easing of supply constraints in the market for solar grade silicon meant that PV supply was liable to increase rapidly, putting pressure on marginal producers.  I expect that the loss of PV demand due to tighter credit markets will more than compensate for the added demand due to the extension of the solar Investment Tax Credit (ITC) and the exemption of the ITC from the Alternative Minimum Tax in the United States.  One other change was that utilities can now benefit from the ITC, and this may be an added boost to the market.

With PV demand increasing at a slower rate, and PV supply continuing to grow rapidly, and possibly even accelerating, PV cell prices will have to fall significantly to clear the market.  Low cost producers such as First Solar (NASD: FSLR) will continue to make money on every panel, although their profit margins will shrink, but the real pain is likely to be felt by higher-cost, commodity producers, and those with thinner profit margins. 

With volumes increasing rapidly, but much thinner profit margins for even those producers able to remain profitable in a much more competitive climate, I have sold all my holdings in PV manufacturers (Sharp (SCHAY.PK), Evergreen Solar (ESLR), and Solar exchange traded fund TAN.  

Balance of System

The news is not all bad for the solar industry, however.  If volumes rise and prices fall as dramatically as I expect, suppliers of other parts of solar systems and services, such as installation will also see volumes rise.  Those suppliers with pricing power will still be able to maintain or even expand margins even as their volume expands, with a dramatic effect on potential profits.

Which suppliers will have the most pricing power?  Competition theory suggests that pricing power will go to those market participants 

  1. In industries which have barriers to new entrants
  2. Suppliers and Customers have little bargaining power
  3. Have little internal competition
  4. Sell products for which there are few substitutes.

Possible candidates in other parts of the solar supply chain are solar installers, assemblers of solar modules, and suppliers of solar inverters.

Solar installers suffer from fairly easy entry into the industry, and are likely to have fairly weak bargaining power with cash-strapped customers, who can easily choose to not buy solar at all.   Solar module assembly is also fairly low tech, and does not seem to present real barriers to entry.  

One wildcard here may be vertically integrated solar companies.  Sam Weaver, VP of Cool Solar, a solar installer in Boulder, CO, likes SunPower Corporation‘s (NASD:SPWRA) vertically integrated approach, which the company hopes will allow them to squeeze all components of a solar system equally. 

However, vertically integrated solar companies may be able to gain competitive advantage over companies operating in one or two of these sectors.


The inverter industry is in a much better competitive position.  First, there are few active participants, making the inverter market relatively uncompetitive, in comparison to cells, modules, and installation.  In the residential grid-tied market, the major players are privately held Fronius and SMA. [Correction: SMA is public in Germany. Ticket S92.DE]   Sam Weaver says there are also a couple companies looking to enter the market, meaning that it might become more competitive, although probably not so competitive as the PV market. Until it was recently acquired by Schneider Electric,  Xantrex Technologies allowed public investors (including myself) an entry into this market, although they also compete in commercial and utility scale markets.

The utility scale inverter market is more promising for investors, partly because there are more publicly traded companies.  When I last wrote about inverter stocks a year and a half ago, my thought was to avoid the bubbly nature of the solar sector, but still benefit from its growth.  At the time, I listed Xantrex, SatCon Technologies (NASD:SATC), and  Sustainable Energy Technologies (STG.V, STGYF.PK) as possible ways to play the industry.  

Xantrex was bought out at approximately double the price it had been trading in March 2007, wile SatCon is up about 50%.  Sustainable Energy Technologies is down around 40%.  Considering that most alternative energy indices have lost about 50% over the same period, even Sustainable Energy Technologies has been doing fairly well.

Since that time, Advanced Energy Industries (NASD:AEIS) introduced their Solaron high efficiency utility scale inverter line.  AEI has a solid balance sheet and cash flow, while both SatCon and Sustainable Energy may need to raise money in the next year, which leaves them vulnerable if financial markets continue to be very tight.  I have sold part of my holdings in both companies.   The downside of AEI is that they are exposed to many other industries, which I have not yet researched properly, and probably do not have the same growth prospects as the inverter industry.

One final inverter play was highlighted by guest author Saj Karsen, who found value in Equus’s (NYSE:EQS) stake in a private inverter company.

For investors interested in playing the Solar market, inverters still seem a relatively good bet, in comparison with direct investment in PV companies.

DISCLOSURE: Tom Konrad has owns shares in  SATC and STGYF.

DISCLAIMER: The information and trades provided here are for informational purposes only and are not a solicitation to buy or sell any of these securities. Investing involves substantial risk and you should evaluate your own risk levels before you make any investment. Past results are not an indication of future performance. Please take the time to read the full disclaimer here.


  1. I fully agree. But SMA Solar, the prime inverter play went public this summer and is listed on the Frankfurt Stock Exchange. Ticker S92.DE

  2. In your September 8th 2008 post, you told us “…Evergreen seems relatively well placed for the coming solar storm.”
    Now, two months later in response to concerns of a perfect storm brewing over the solar industry in 2009, you have sold all your holding in Evergreen Solar.

  3. JS-
    That’s true. I was clearly wrong about Evergreen being well placed- I had no idea that their connection to Lehman would turn out to be a bad thing.
    Second of all, I have sold all my positions in Solar manufacturers (I also sold Sharp… I still hold Applied Materials, an equipment supplier, but wish I had sold that at the same time) but not just in response to the “Solar Storm” I was anticipating in early September… in response to the combination of the Soalr Storm and the financial crisis.
    In other words (1) I was wrong about ESLR being relatively well placed because of the Lehman connection, and (2) I did not anticipate the speed or severity of the financial crisis.
    I certainly wish I had not made the above mistakes. The best I can do now is admit to them and learn from them.


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