ST. PAUL (AP) - Minnesota regulators have approved a $250 million solar power project that is set to be the biggest in the state.

Edina-based Geronimo Energy plans to install solar panels at as many as 21 sites in Minnesota as part of its Aurora Solar Project.  Geronimo officials plan to spread out the sites to make sure cloudy weather doesn't affect the system.

The Aurora project would increase Minnesota's solar output sevenfold. Plans call for its completion next year and for the power to be sold to Xcel Energy.

The panels are set to be installed on sites near existing electric substations, eschewing costly transmission lines. Many of the sites are farmland.