Technology
Transmission congestion occurs when electricity demand exceeds the capacity of transmission lines to deliver power from generation sources to consumers. Congestion causes locational price differences and can limit renewable energy deployment in constrained areas. Transmission congestion is a growing challenge as renewable energy deployment accelerates. Solar and wind resources are often located far from population centers, requiring long-distance transmission. When transmission capacity is insufficient, renewable energy cannot be fully utilized, and prices spike in congested areas. Grid operators address congestion through transmission upgrades, demand response, energy storage, and distributed generation. Distributed solar projects help alleviate transmission congestion by generating power near consumption points, reducing transmission losses and grid stress. For investors, understanding transmission congestion helps contextualize the value of distributed renewable energy and grid modernization investments. Projects in areas with transmission constraints may command premium prices due to their grid-support value.