State and local bond finance represents a powerful but underutilized tool for future clean energy investment. For 100 years, the nation’s state and local infrastructure finance agencies have issued trillions of dollars’ worth of public finance bonds to fund the construction of the nation’s roads, bridges, hospitals, and other infrastructure—and literally built America. Now, as clean energy subsidies from Washington dwindle, these agencies are increasingly willing to finance clean energy projects, if only the clean energy community will embrace them.

So far, these authorities are only experimenting. However, the bond finance community has accumulated significant experience in getting to scale and knows how to raise large amounts for important purposes by selling bonds to Wall Street. The challenge is therefore to create new models for clean energy bond finance in states and regions, and so to establish a new clean energy asset class that can easily be traded in capital markets.