Lunar Energy is Scaling Home Battery Deployments and AI-powered VPP Software to Meet Surging Demand for Affordable Electricity

Lunar Energy, the leader in integrated home battery systems and Virtual Power Plant software, led by Kunal Girotra, and others, announced it raised $102 million in an oversubscribed Series D round led by B Capital and Prelude Ventures. This round follows a previously unannounced Series C financing of $130 million led by Activate Capital. These commitments will accelerate Lunar’s mission of powering every home with clean, reliable, and affordable energy with its suite of hardware and software products. The Series C and Series D funding rounds also included participation from DCVC, Piva Capital, Leitmotif, Sunrun, Itochu Corporation, and Q Capital Partners. 

Following its California launch, Lunar will use the financing to expand its home battery system nationwide and scale Lunar Gridshare, its AI-driven platform managing the country’s largest Virtual Power Plants. With thousands of systems deployed and 650 MW under management globally, Lunar demonstrates that combining hardware and software is key to affordable, reliable, and secure energy.

“This financing validates our founding vision,” said Kunal Girotra, Founder and CEO of Lunar Energy. “The energy transition requires both hardware and software. This funding enables scaling that model, helping homes electrify and participate in a smarter, more resilient grid.”

In its first commercial year, Lunar deployed thousands of systems in California. Its Gridshare platform powers Sunrun’s distributed power plants across multiple U.S. markets and supports community choice aggregators in California, as well as utilities and energy retailers in Europe and Asia. Customers benefit from affordable energy, with AI-driven software earning an average of $464 through VPP participation and saving an additional $338 versus standard battery use. Designed in California and assembled in Georgia and Washington, the Lunar System supports U.S. leadership in the energy transition and qualifies for clean energy tax credits.

“The residential battery industry is at a turning point, and Lunar’s integrated hardware-software system is setting a new standard,” said Jeff Johnson, General Partner at B Capital. “By combining modular hardware with AI-driven optimization, Lunar maximizes solar production, ensures reliability, and drives energy affordability, supporting both homeowners and the grid while accelerating VPP adoption.”

Tim Woodward, Managing Director at Prelude Ventures, added, “Lunar’s DC architecture, intelligent hardware, and easy installation differentiate its residential battery, driving strong market traction. It's advanced energy optimization helps homeowners manage rising electricity costs and shapes the next generation of decentralized grid operations.”

“Lunar combines two key insights: integrated solar and storage create resilient homes, and edge flexibility is increasingly valuable for grid stability and household resilience,” said Raj Atluru, Managing Partner of Activate Capital. “With rising power shortages and grid instability, demand for storage solutions like Lunar is surging among consumers, utilities, and governments. We were excited to lead their Series C and are proud to back them again in Series D, confident in their hardware and software innovation.”