Modular wind turbine blade

A modular wind turbine blade comprising a first blade module having a first spar cap extending longitudinally in a spanwise direction and a second blade module having a second spar cap extending longitudinally in the spanwise direction, the blade modules being configured for connection end-to-end via their respective spar caps,

• the first spar cap comprising first and second beams arranged side-by-side, each beam of the first spar cap having a tapered end defining a scarfed surface, with the tapered end of the first beam of the first spar cap extending beyond the tapered end of the second beam of the first spar cap;
• the second spar cap comprising first and second beams arranged side-by-side, each beam of the second spar cap having a tapered end defining a scarfed surface, with the tapered end of the second beam of the second spar cap extending beyond the tapered end of the first beam of the second spar cap;
• wherein the blade modules are configured such that when the modules are connected together the scarfed surfaces of the respective first beams mate to form a first scarf joint and the scarfed surfaces of the respective second beams mate to form a second scarf joint, the first scarf joint being offset from the second scarf joint in the spanwise direction.