The biggest buyer of solar farms in America is a company you've probably never heard of. Meet Capital Dynamics, an asset manager that handles $15 billion. The firm's been snapping up clean-power plants for years, but it wasn't until this month - when the company agreed to spend almost $1 billion on a solar business - that it really landed on mainstream investors' radar. Now the firm is being called the harbinger of things to come, heralding the next generation of solar and wind farm owners: funds backed by institutional investors like pensions. Its agreement this month to buy 8Point3 Energy Partners LP is among the biggest in a recent string of clean-energy deals done by infrastructure funds. They're appeasing their investors, who are hungry for the dependable, long-term returns of renewable-energy. After clinching $3 billion of clean-power deals last year ... Capital Dynamics is positioned to buy even more. A key part of the firm's strategy hinges on capital from its institutional investors. Such investors like that they can match their long-dated liabilities with the returns of solar and wind farms that can stretch over decades. Another edge that Capital Dynamics has over other asset managers: It has spent years building an in-house team with an expertise in solar and wind farm operations, one that leverages its relationships with tax-equity investors and banks.