Germany's Solar Expansion: Voltage Control Could Offer a Solution Over Line Expansion

Thüga AG, a German energy company, has deployed a medium-voltage voltage adjustment device in Thuringia's distribution network without adding new lines, enhancing solar connection capacity. This marks a technological demonstration to improve existing grid utilization as solar adoption strains distribution networks. The MSLR (Medium Voltage Line Regulator) allows existing power lines to accommodate up to 260% more solar generation capacity. The pilot project could connect approximately 2,750 rooftop solar systems to the grid. By controlling voltage through existing infrastructure, MSLR eliminates the need for costly line upgrades and permits, potentially reducing grid investment costs by hundreds of millions of euros by 2035. The demonstration highlights shifting challenges from generation capacity to grid absorption limits, positioning voltage control as a viable alternative to line expansion.