by Emma Foehringer Merchant
March 21, 2018

Battery and solar module costs have both dropped precipitously in recent years, leading to a strong reduction in overall system prices. But they can only fall so far. 

As the International Renewable Energy Agency noted in 2016, “as equipment costs fall, the importance of addressing balance-of-system costs, improving the performance of the technologies, reducing O&M costs and driving down the cost of capital all start to take on greater importance.”

IRENA’s assessment of solar PV balance-of-system (BOS) costs in 2015 found that costs...