Solar Power Startups funded by Y Combinator (YC) 2026

The best grid connection is no grid connection. Voxel builds vertically integrated energy generation and storage systems for data centers that bypass utility connection delays. By leveraging the vast supply of second-life EV batteries and our novel DC microgrid architecture, Voxel generates datacenter power on site and drastically reduces system cost and time-to-power.

Astro finds and buys land for new renewable energy projects, secures grid connections at minimal cost, and sells these development-ready projects to larger energy companies. Founded by Alex Fuster, a former Citadel energy trader, Astro's AI models identify profitable grid connections that eliminate the surprise costs causing 80-90% of renewable projects to fail. With the U.S. needing 2,000 gigawatts of new power generation by 2035 for AI data centers and electrification, Astro unlocks development opportunities that traditional methods consistently miss.

Plume is an AI-powered geospatial platform for site selection in energy infrastructure projects. Selecting the right sites requires analysis of +50 geospatial, grid, and regulatory constraints across fragmented data sources. Plume changes the process by enabling users to interact with geospatial data using natural language.

Spark AI is workflow software for solar, storage, and data center developers. We've reviewed and identified over 1 million zoning, permitting, and project-related documents in nearly every jurisdiction in America, so that you can instantly identify project requirements, local sentiment, and fatal flaws in seconds. We’re trusted by dozens of industry-leading developers representing over 90 gigawatts of project pipeline and $30 billion in financing. Our team combines leadership experience from AI and energy (Microsoft, Apple, Department of Energy, Brex).

Coperniq is workflow software for solar & energy contractors. It cuts soft cost per installation by $3K (17% of total cost) & accelerates project completion by 45 days (30% of project timeline). We replace Salesforce, spreadsheets, pencil-&-paper, & other hacky workarounds with an industry-specific application for the underserved energy workforce. Main benefits for our customers 1. Finish projects faster and cheaper: Our platform cuts 17% of soft costs, allowing contractors to deploy more projects, faster, and cheaper, with 5-star customer experience every time 2. Turn costly (often unprofitable) service calls into a revenue engine: By integrating with hardware OEMs (Enphase, SolarEdge, etc...), Coperniq gives you real-time health checks for your install base, automates service tickets, & drives referral revenue Coperniq does all this and much more in one beautiful platform! Are you or someone you know running or thinking about starting a solar company? [Schedule a call with us :)](https://calendly.com/coperniq-sales/discovery-web-v2 )

We offer no-money-down installations that generate free money for homeowners from day one. We are digitalizing the whole process of going solar. Instead of using traditional forms and leaving it up to customers to fill them, we use technology to take all that burden off our customers plate. We only ask for an address and offer free instant quotes.

Nira is a map tool, built for renewable energy developers, that shows available capacity at every interconnection point on the electrical grid. Customers like AES and Cypress Creek use Nira to find the most profitable points on the grid to site new projects.

Wand Solar enables Solar Revenue for Income Properties owners. By empowering landlords to sell solar energy directly to tenants, we make it a no-brainer for landlords to adopt solar energy.

Charge Robotics is building robots that automate the most labor-intensive parts of solar construction. Solar has rapidly become the cheapest form of power generation in many regions. Demand has skyrocketed, and now the primary barrier to getting it installed is labor logistics and bandwidth. Our robots remove the labor bottleneck, allowing construction companies to meet the rising demand for solar, and enabling the world to switch to renewables faster.

We find roofers more roofs, and homeowners the right roofer. There are over 80 million homes in the US, and eventually, every one of them will need a new roof. Our technology allows contractors to focus on what they do best—getting a repaired roof over homeowners' heads quickly.

SmartHelio provides a software that helps solar utilities automatically predict and prevent downtime disruptions. We help solar utilities to generate extra $200k per plant income on $10k spent using our software, by preventing 700 faults per year. We have a platform which reads live data (current, voltage, weather parameters) from a solar plant, runs algorithms to decouple various factors for the underperformance and provides recommendations to fix it. This data is 100% available for the large scale solar in the world just using software (e.g. APIs). Product launch: https://www.producthunt.com/posts/heliocloud Our cloud software is being used by 40+ leading solar developers in Europe and Asia. We have analyzed 25+ billion of data points from over 3 GW of solar assets spread across the globe in the last 2 years.

Momentus is a space infrastructure services company. As a first mover, Momentus will offer the most basic, foundational services that enable businesses to flourish in space. With their experienced team of aerospace, propulsion, and robotics engineers, Momentus makes and operates cost-effective and energy-efficient in-space transport and service vehicles that utilize water plasma propulsion technology. Momentus has service agreements in place with numerous private satellite companies, government agencies, and research organizations.

Solar power is the #1 source of new energy in the world. Raptor Maps is a fast-growing, MIT-born startup that builds software to manage the solar lifecycle. We are deployed across 45 countries and 200+ million solar panels. Our software enables the solar industry to scale. We're headquartered at Greentown Labs, the largest cleantech incubator in the US and also support fully remote employees.

SunFarmer provides affordable solar energy for hospitals, schools, businesses, and farms in developing countries. In many parts of the world, electricity is unavailable, unstable, or extremely expensive. Yet reliable electricity is critical for high quality healthcare, modern education, economic development, and improved agricultural productivity. Learn more at sunfarmer.org

Bright is Mexico’s #1 residential solar provider (think Sunrun for the developing world, starting first in Mexico). We provide the financing and software that enable thousands of student ambassadors and retail promoters to offer cheaper electricity to homes at no upfront cost, and we work with our network of hundreds of local installers and distributors to satisfy the resulting demand. Our first market is Mexico, which has more sun, higher electricity rates, and lower labor costs than the US. Bright's investors include First Round Capital, Y Combinator, and other top Silicon Valley firms.

Oolu was founded by Nilmi Senaratna and Dan Rosa in 2015. The company's mission is to provide off-grid households in rural regions in Africa with high quality products at an affordable price. In Wolof, a national language of Senegal, Oolu means ‘trust.’