IRENA Projects Slowdown in Renewable Capacity Additions for 2026

The International Renewable Energy Agency leadership has highlighted that new renewable generation capacity additions are expected to experience a notable downturn in 2026. The primary drivers behind this anticipated contraction are persistent power grid capacity shortfalls and expanding global trade barriers that hamper international equipment supply chains.

Grid infrastructure inadequacy is rapidly transitioning from a localised project risk into a systemic constraint on overall energy transition objectives. For electrical utilities, independent power producers, project developers, and transmission system operators, the principal bottleneck is no longer the availability or cost of generation assets such as solar panels or wind turbines. Instead, grid integration limits are dictated by the available transfer capacity of high-voltage transmission corridors, the availability of grid-connection slots at collector substations, and severe supply constraints affecting large power transformers.

Furthermore, trade restrictions and protectionist measures worsen supply chain bottlenecks for critical substation equipment. Lead times for high-voltage transformers, gas-insulated switchgear, and specialised protective relaying have extended significantly. When global trade barriers restrict the cross-border movement of key electrical components and raw materials, transformer manufacturers face increased production delays, which directly delays the commissioning of substations required for renewable integration.

As renewable integration encounters obstacles toward 2026, network operators must shift operational priorities toward maximising the availability and reliability of existing grid assets. Rather than assuming rapid transmission expansion, engineering teams must focus on asset health management, advanced oil diagnostics, thermal monitoring, and life-extension programmes for existing transformer fleets to handle sustained load pressures without compromising system reliability.

What this means for asset owners in Türkiye: Grid connection queues and transmission congestion will place increased emphasis on maintaining current substation infrastructure. Asset managers operating in Türkiye must proactively manage transformer maintenance, dynamic loading, and insulation testing to avoid thermal overloads and unplanned outages as high-voltage connections face extended delay windows leading into 2026.