Energy Startups

Reefilla provides charging solutions for electric mobility and develops products to replace combustion generators across multiple contexts. The company focuses on enabling energy transition.

1 investor

Reelwell develops wired drillpipe technology for the oil and gas downhole drilling sector, offering digital telemetry, power delivery, and improved reliability for both land and offshore drilling operations. Its technology aims to reduce well construction costs and environmental emissions through drilling efficiency gains.

1 investor

Refraction Energy is an oil and gas company operating in the upstream energy sector, with a focus on unconventional plays in Canada such as the Duvernay and Montney formations.

1 investor

Regeno develops modular, plug-and-play wind turbines designed for rapid deployment and lower costs than traditional systems. The turbines are built from stackable components, require no cranes for installation, and are targeted at businesses seeking renewable energy with shorter payback periods.

1 investor

Reliance Production Optimization operates natural gas assets and provides daily operations, optimization, and maintenance services for sweet natural gas producers. The company serves oil and gas operators seeking cost reductions and improved asset management through field-deployed teams and specialized optimization expertise.

1 investor

Relode develops transmission-connected battery storage and electric vehicle charging infrastructure on the UK electricity grid, drawing on expertise across grid, planning, and engineering. It focuses on electricity infrastructure development and delivery in the United Kingdom.

1 investor

Remea offers a platform for EV charging station operators and businesses, providing real-time data, access management, customizable pricing, and monthly reports, alongside a web app that lets drivers scan, pay, and charge without downloading anything.

1 investor

Remix Point develops renewable energy and battery storage solutions to provide stable, distributed electric power and create sustainable energy systems for communities and regions.

1 investor

Remote Energy is a 501(c)(3) nonprofit founded in 2017 that trains technicians, educators, and community members in solar energy installation and maintenance across developing countries. The organization works to increase access to reliable renewable energy in marginalized communities while addressing racial, gender, and economic disparities in the solar industry.

1 investor

Remote Power Corp designs and manufactures modular, mobile, natural gas and propane-powered generation systems for temporary and on-demand power applications across various industrial and project-based sectors.

1 investor

Renalfa develops and operates renewable energy assets, including solar, wind, and grid-scale battery storage systems across Eastern Europe. The company serves the energy transition market in the region with a portfolio exceeding 1 GW of operating power capacity and 2.5 GWh of storage across Hungary, Bulgaria, Romania, North Macedonia, Lithuania, and Poland.

1 investor

Renbee is a UK platform for home decarbonisation that connects homeowners with vetted renewables installers, offering transparent quoting, project planning, and progress tracking. For installers, it provides a steady flow of customers plus tools for training, certification, and automated regulatory compliance.

1 investor

Rendesco designs, installs, and operates heat pump and battery storage systems for residential and commercial properties to reduce energy costs and carbon emissions. The company provides end-to-end solutions including compact cylinder-free heat pump systems, cloud-based optimization platforms, and funded clean heat networks for developers and social housing projects.

1 investor

Reneon Tech provides sensors, gateways, and software platforms for building managers and energy professionals to monitor and analyze energy consumption. The company also supplies green technology products and offers consultancy services to help buildings and cities improve energy efficiency and achieve net zero emissions.

1 investor

ReNew develops and operates renewable energy projects across India, holding one of the country's largest portfolios of clean energy assets. The company focuses on the clean energy transition and sustainability, positioning itself around decarbonization and renewable power generation.

1 investor

Renewcast provides short-term and intra-day wind and solar power generation forecasting as a service, using deep learning digital twin models on an Azure cloud platform to help energy operators reduce imbalancing costs. Its forecasts are delivered via API and a client UI for traders and energy operators managing renewable portfolios.

1 investor

Renewvia designs, installs, owns and operates commercial, community, and utility-scale solar power systems and energy storage assets across the United States and Africa for businesses and off-takers. The company provides turnkey solar installation, integrated financing, consulting, and operations services for commercial clients and develops microgrids in underserved regions.

1 investor

RenSource develops, finances and manages solar and hybrid energy systems for commercial and industrial businesses, including universities, hospitals and industrial facilities. It provides energy infrastructure, financing and asset management across Africa, with Nigeria as its largest operational market.

1 investor

RenuLogix provides engineering, procurement, construction, and project management services for solar, storage, and EV charging infrastructure projects. The company serves developers and operators seeking reliable project delivery backed by technical expertise and customer service.

1 investor

Renuvi develops a long duration energy storage system based on its proprietary Salt-Matrix sodium-based battery electrochemistry, aimed at providing reliable clean energy for the power grid. The company positions its technology as a manufacturable battery with higher energy density than other sodium-based designs.

1 investor

iQueue is a software platform for searching the U.S. interconnection queue, benchmarking renewable energy projects, and building acquisition shortlists based on custom criteria. It serves renewable energy M&A and developer teams by turning fragmented queue, land, permitting, and ownership data into project viability assessments for diligence and deal sourcing.

1 investor

RePowered Batteries evaluates surplus, end-of-life, RMA, and recalled battery inventory (post-consumer, industrial, and EV) to determine remaining value and repurpose batteries into new applications. It connects buyers, sellers, and partners across the battery supply chain and manages compliant recycling and disposal for businesses at every stage of the battery lifecycle.

1 investor

Repsol is a multi-energy company that produces and supplies energy, and works on the energy transition through initiatives run by its foundation. The page references quarterly financial results, press releases, and social initiatives combining innovation and technology.

1 investor

REPWR is an Indigenous-owned clean technology company that designs and manufactures modular, high-efficiency solar systems for ISO shipping containers and intermodal freight, enabling ships, trains, and trucks to run on solar power. It also provides resilient solar-based power for islanded microgrids serving the port, mining, and defense sectors.</parameter> <parameter name="founders">[{"full_name": "Zachary A. McCue", "title": "Founder"}]

1 investor