At present, the community solar market in the US is tiny, with only several hundred megawatts of cumulative capacity in place. But that figure could grow to 11GW by 2020, and perhaps even higher, the report says.

"Shared solar" could represent 32%-49% of the distributed PV market in the US in 2020, equivalent to 5.5-11GW of cumulative capacity over the next half decade, according to the report.

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