Last year I wrote about the cost of residential solar electricity. It included a sensitivity analysis that links financing and installation costs to the levelized cost of distributed solar electricity. We always expected that both of those input costs would be declining over time through the virtuous circle of a growing and competitive solar market. As the market grows, costs will be driven down through economies of scale and competition. Lower costs means a larger addressable market as more and more customers can financially benefit from distributed solar electricity. And on it goes. However, as installation costs have fallen dramatically (by 30-50% in the last 3 years), financing costs have declined relatively modestly. As financing has a very significant impact on the future state of the industry, it’s worth exploring why that side of the cost structure has been so sticky.
There are two main drivers of financing costs in the solar industry: (1) how cheap the capital is that is used to finance the capital outlay to build the system and (2) how intense the margin pressure is on the financing providers:
(1) Cost of Capital
Cost of capital in the solar industry is a complicated beast. The financing mechanism is very complex and requires paying lawyers and accountants a lot of money to set up. (Those fees easily add up to over a $1m per fund.) The fund complexity and lack of long-term data is making the asset class less interesting for many conservative investor groups like pension funds, large companies or many banks. Additionally, as we are moving from a cash grant to a tax equity world, the supply of capital will continue to be restricted. As long supply is limited, costs will not decline as rapidly as install costs have.
(2) Competitiveness
This one is closely linked to the above: as long as it is difficult to put together the financing structures to finance distributed energy assets and as long as large financial institutions are waiting on the side line, it will be difficult for new solar financing companies to enter the market, innovate and drive down economic rents. Over the last couple of years we have seen a few companies like Sungevity, Suncap and a few others try hard to dethrone Solarcity and Sunrun, but they have not managed to hold on to temporary market share gains. Others like SunEdison have exited to market quickly.
So where are we heading from here?
Given the complexities around monetizing the tax credit, I don’t predict financing cost to decline significantly in the next 12-18 month. Over time, increased interest in this fast growing market, more operating history of the asset class and innovative financing approaches (including securitization) should drive down the cost of capital. After all the risk-adjusted return profile of this asset class is very attractive. Especially in this low-interest world we will be in for the foreseeable future. The result will be lower cost of distributed solar electricity to the end consumer and more markets reaching grid parity.
There are two main drivers of financing costs in the solar industry: (1) how cheap the capital is that is used to finance the capital outlay to build the system and (2) how intense the margin pressure is on the financing providers:
(1) Cost of Capital
Cost of capital in the solar industry is a complicated beast. The financing mechanism is very complex and requires paying lawyers and accountants a lot of money to set up. (Those fees easily add up to over a $1m per fund.) The fund complexity and lack of long-term data is making the asset class less interesting for many conservative investor groups like pension funds, large companies or many banks. Additionally, as we are moving from a cash grant to a tax equity world, the supply of capital will continue to be restricted. As long supply is limited, costs will not decline as rapidly as install costs have.
(2) Competitiveness
This one is closely linked to the above: as long as it is difficult to put together the financing structures to finance distributed energy assets and as long as large financial institutions are waiting on the side line, it will be difficult for new solar financing companies to enter the market, innovate and drive down economic rents. Over the last couple of years we have seen a few companies like Sungevity, Suncap and a few others try hard to dethrone Solarcity and Sunrun, but they have not managed to hold on to temporary market share gains. Others like SunEdison have exited to market quickly.
So where are we heading from here?
Given the complexities around monetizing the tax credit, I don’t predict financing cost to decline significantly in the next 12-18 month. Over time, increased interest in this fast growing market, more operating history of the asset class and innovative financing approaches (including securitization) should drive down the cost of capital. After all the risk-adjusted return profile of this asset class is very attractive. Especially in this low-interest world we will be in for the foreseeable future. The result will be lower cost of distributed solar electricity to the end consumer and more markets reaching grid parity.

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