DALLAS—Texas has more solar power than anywhere else in the U.S. But there’s plenty of opposition to the energy resource that’s credited with helping avoid the risk of summer blackouts this year.

Chief among these criticisms is the issue of land. More often than not, roofs and lots end up often being finite spaces. For installers, home owners or developers, ensuring there’s enough room for the number of solar panels needed can be an obstacle.

A new Dallas-based start-up, Janta Power, aims to address that. The firm created 3-D solar towers—modular panel designs that swivel on a single axis to track the sun and are vertical rather than horizontal.

Janta’s founder, Mohammed Njie, said that by building up, the towers reduce land requirements, installation time and maintenance complexity, wh

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