Many down-votes but no comments?

I think as long as they serve the community as a means of exchange (as opposed to a store of value) and are freely inflated as by need of the community, many local currencies can co-exist in a Solarpunk world. But they would probably play a more minor role in day to day life.

A local currency could for example be created by an community fund to pay the workers of a larger public project and people accepting this money would in a sense become investors into this community structure then.