Construction innovations could cut gigawatt-scale solar costs by 22%

Research from Lightsource bp finds that combining four construction innovations could cut direct installation costs for gigawatt-scale solar farms by around 22% and reduce installation time by up to 30% compared with current standard practice.

What four innovations drive the savings?

The UK-based independent power producer assessed automated foundation piling, a frameless panel design using steel instead of aluminium, press-fit bolt-free module installations, and on-site pre-assembly. Automated piling rigs guided by GPS can reduce installation time by up to 12.5% while lowering costs and improving consistency. The press-fit, bolt-free approach — where panels click into position — can cut installation time by up to 30% when paired with automated piling and the new module design, replacing conventional clamps and bolts.

When will these methods reach real projects?

Lightsource bp says the combined approach is intended for large-scale PV development from 2028 onwards. The company plans trials in Australia and the United States to validate supplier data and support bankability, with initial results targeted within the next 18 months. The NextGen Solar Programme is now moving from modelling into real-world validation on active projects, including robotic module placement and advanced cable harnessing.

Why does gigawatt-scale construction need new methods?

Chris Buckland, Global Technical Director at Lightsource bp, explained that demand for solar energy is rising but building at gigawatt scale is constrained by existing construction methods, affecting some projects’ commercial viability. The programme aims to deliver an evidence-based roadmap for scaling solar farm construction efficiently.

Ecoverse analysis

If the 22% direct installation cost reduction holds across a 1 GW project with typical installation costs of $0.30/W, that equals roughly $66 million in savings. A 30% time reduction could also lower financing costs and accelerate revenue generation. The shift from aluminium to steel frames may further reduce material exposure to price volatility, though Lightsource bp has not disclosed those figures.

For homeowners considering rooftop systems, the same principles of faster, simpler installation apply at smaller scale. See our guide on how to size a home solar system and how solar pays for itself.