Are shadow losses considered in ieco?

Yes. ✅

Horizon

Shadow losses from geographical features such as mountains are considered by default. In the notes section of the ieco template proposal, you can find a polar diagram representing the horizon where you can see shading due to terrain marked in gray.

Local shadows

Losses due to local shadows are caused by nearby obstacles such as a building or a chimney represented in the 3D scene. To take these losses into account, you can refer to How can local shading be taken into account in the simulation.