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Cost Of Solar PV Continues To Plummet

Originally published on RenewEconomy.

One of the most misunderstood aspects of the solar PV phenomenon over the past 5 years is the idea that it has been that it has been driven entirely by surplus capacity from China, and little else. Defenders of fossil fuel generation will tell you that the cost reductions are a mirage, and will solar module prices will likely rebound as the market comes into balance.

They are in for a nasty shock. Between 2007 and 2012 it is estimated that solar manufacturing costs fell by between 70 and 80 per cent – courtesy of the feed in tariffs that began in Germany and spread elsewhere, and the manufacturing boom that followed, particularly in China.

But the cost fall was not simply a matter of capacity, it was also about efficiency – more powerful modules, less silicon, less metals, improved manufacturing processes and so on. And the fall is continuing.

Last week, SunPower, the second biggest US solar PV manufacturer, said it had succeeded in reducing manufacturing costs by 20 per cent over 2013, following a similar fall a year earlier (and the year before that). And it managed to obtain an even bigger (25 per cent fall) in the balance of systems costs, the amount it costs to make and install solar modules in utility-scale solar farms.

The latest cost fall has been significant for SunPower, because it means it can lift its margins from slightly negative to nearly 20 per cent,  and deliver a solid return to shareholders. Further cost cuts means it will either improve its margins, and returns to shareholders, or be able to meet consumer price falls if another surge in capacity emerges.

These are the signs of a sustainable industry. More importantly, they underline the cost reductions that can be achieved by deployment at large scale. Some of these gains are based on local knowledge, which is why it is frustrating that Australia is not moving down the track.

SunPower president and CEO Tom Werner says the cost falls are not over yet. He told analysts last week that its next line of manufacturing plant will likely reduce the cost per watt by a further 35 per cent over its current manufacturing lines.

And there will be further lift in efficiencies – the new manufacturing plant (known as Fab 4) will enable SunPower to drive higher cell efficiencies, and it plans to produce its first 23% X-Series panel by the end of 2015.

sun power solar pvThe 24 per cent reduction in utility-scale deployment is also critical. SunPower had deployed a 1MW module that it dubbed Oasis as the basis for its large-scale plants – which include the 250MW California Valley Solar Ranch and the 579MW Solar Star project it is building for Warren Buffet’s Mid American Holdings.

However, Oasis has now been scaled up to a 1.5MW module block, which can be replicated on any site. It improves installation efficiency because it’s partially pre-fabricated, it’s pre-engineered, and the mounting structures are optimized so less steel used..

There are other cost reductions in the pipeline. SunPower recently purchased a small California-based robotics engineering company called Greenbotics. This will enable it to cut water usage for cleaning by around 90 per cent and lift its energy production at the same time. This will be key in hot (and dusty) markets such as the Middle East, South Africa and Chile.

“We believe that SunPower’s ability to directly attack cost across the entire value chain represents an important source of long-term competitive advantage,” Werner said.

Two other areas which will be crucial in future deployment are in storage and finance. SunPower says the integration of energy storage into its products are a major focus and it is implementing a number of pilot programs. More details will be released later this year.

Finance is also critical, and SunPower has now attracted more than $1 billion in third-party finance to offer home leasing, which forms the major part of the market in the US, and a growing component elsewhere. “We’ve also seen the cost of financing just going down,” Werner said.  “For instance, the BofA ($220 million Bank of America) deal that we just consummated has a lower cost to tax equity than our first deal did. So, that competition is working, it’s driving down the overall costs.”

(It should be noted that the average solar PV installation in the US among SunPower’s customers is 8.3kW. That’s nearly three times the average installation size in Australia).

Meanwhile, SunPower’s C-7 concentrated solar PV technology is also emerging into the commercial arena, and recently gained a contract to provide a 20MW facility for a data-centre, as well as entering a joint venture for the technology in China. Werner says the concentration will improve as the company introduces its higher efficiency cells. “It has the potential to be very cost-effective and it has the virtue of utilising our (manufacturing) output very efficiently. “it’s economically competitive and … it’s faster to scale.”

SunPower, as we have previously noted, is also about to begin construction of a 70MW merchant power project in Chile, which has surging demand and insufficient capacity and, as a result, high wholesale electricity prices. It also has the best solar resources in the world, and SunPower’s will be the biggest solar installation that will compete with other technologies on the open market.

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Written By

is the founding editor of, an Australian-based website that provides news and analysis on cleantech, carbon, and climate issues. Giles is based in Sydney and is watching the (slow, but quickening) transformation of Australia's energy grid with great interest.


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