The 12 closest competitors and alternatives to Think Box Capital Group LLC among renewable energy & sustainability companies — ranked by similarity to what Think Box Capital Group LLC actually does, not by market-cap band.
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ThinkBox Capital Group develops sustainable projects that fix aging building equipment, generate renewable power, upgrade operations technology, lower climate emissions, and reinvest in local communities. The company provides these services to clients seeking to improve building efficiency and environmental performance.
Think Box Capital Group LLC is a renewable energy & sustainability company headquartered in United States. Its most recent funding round raised $30M in June 2025. Xcout tracks 7 named people at Think Box Capital Group LLC, including James Marshall (POA from Leemon L Peterson, CEO of Think Box Capital LLC).
1 more named person on record for Think Box Capital Group LLC, with roles, board committees and tenure — see the full roster →
Every round on record:
| Date | Round | Amount | Investors |
|---|---|---|---|
| SEC Form D filing | $30M | — |
Who invested in each round, lead investors, valuations and the co-investor graph — open the full funding history →
Ranked by semantic similarity — how close each company is to Think Box Capital Group LLC by what it does, using Xcout's live company graph. Click any company for its full profile, or its competitor set.
Clean Energy & Energy Efficiency
Slipstream Group Co. develops, tests, and implements energy efficiency and renewable energy programs for utilities, governments, and other organizations. The company provides climate and energy solutions, high-performance building consulting, workforce training, and educational resources to support the clean energy transition.
Renewable Energy
NuPower Development LLC is a renewable energy development and investment company that helps clients achieve economic and energy efficiency. The company specializes in sustainable power projects across technologies such as biomass gasification, fuel cells, combined heat and power, district energy, and battery energy storage systems.
Clean Energy
Kanin Energy, Inc. is a clean energy company that develops waste heat-to-power projects for industrial facilities to reduce carbon emissions and generate clean electricity. The company works with heavy industries to capture wasted thermal energy and convert it into valuable power.
Clean Energy Technology
Alternative Sustainability manufactures patented clean energy-producing devices designed to be installed inside buildings to reduce utility consumption and carbon footprints. The company serves building owners and operators primarily in the New York Metro Area by providing energy efficiency products such as fan series, turbine slide frames, and solar strips.
Renewable Energy
Fieldston Power LLC is a renewable energy developer that modernizes the New York City power grid by building virtual power plants and solar-plus-storage solutions. The company serves landlords, local communities, and building owners by installing distributed energy resources on multifamily, commercial, and industrial properties.
Renewable Energy
Ameresco, Inc. operates as a clean technology integrator, offering a broad spectrum of solutions focused on energy efficiency and sustainable energy generation across the United States, Canada, and global markets. The company serves diverse businesses and organizations by implementing strategies for enhanced energy efficiency, critical infrastructure improvements, bolstered energy security and resilience, improved asset longevity, and the deployment of renewable energy systems. Its operations are structured into distinct segments: U.S. Regions, U.S. Federal, Canada, and Non-Solar Distributed Generation. Ameresco specializes in the conceptualization, development, engineering, and installation of projects specifically designed to lower energy consumption and decrease operational and maintenance (O&M) expenses for client facilities. These projects typically involve tailored interventions aimed at optimizing the performance of critical building infrastructure, including heating, ventilation, cooling, and lighting systems. Additionally, Ameresco delivers comprehensive renewable energy services. This encompasses building small-scale power generation facilities, either owned directly by the company or constructed for clients, to produce electricity, gas, heat, or cooling from sustainable sources. They also provide ongoing operations and maintenance for these plants and market the generated renewable electricity, processed gas fuel, or thermal energy. Beyond this, the company distributes photovoltaic (PV) solar products and integrated systems, offers specialized consulting, and provides enterprise-level energy management solutions. Notably, Ameresco also owns and manages a wind power facility situated in Ireland. Its broad client base includes federal, state, and local governmental bodies, healthcare organizations, educational establishments, airports, public housing entities, universities, and a wide spectrum of commercial and industrial clients. By the close of 2021, specifically December 31st, Ameresco's portfolio featured 147 wholly-owned and operated small-scale renewable energy facilities and solar photovoltaic installations. Founded in 2000, Ameresco, Inc. maintains its corporate headquarters in Framingham, Massachusetts.
Renewable Energy
SolarOne Solutions, Inc. provides renewable energy systems, including solar power, energy storage, and microgrids, for commercial business applications. The company's engineering services help businesses reduce demand costs, lower utility bills, and improve power resiliency.
Energy Infrastructure & Financing
Renew Energy Partners, LLC provides turnkey project financing and capital optimization for critical building infrastructure. The company serves commercial and industrial clients by funding energy efficiency, decarbonization, and infrastructure retrofits from design through operations.
Energy
Sparkfund offers organizations a simpler way to access energy-efficient products and services. The company helps organizations deploy and scale distributed energy solutions.
Energy Efficiency & Utilities
Envocore Holding, LLC provides sustainable infrastructure and energy efficiency solutions, including solar and storage, utility services, water efficiency, lighting, and building envelope improvements. The company serves a variety of clients such as energy service companies (ESCOs), utilities, government entities, educational institutions, healthcare facilities, and correctional facilities.
Energy Consulting
CEG Solutions LLC provides energy infrastructure and deep energy retrofit services, tailoring energy solutions for complex operations and facilities.
Energy
En-Power Group is an engineering firm founded in May 2003 that specializes in full-service building energy management, decarbonization, and sustainability solutions. The company provides energy engineering services designed to optimize building performance, reduce costs, and minimize environmental impact. Additionally, En-Power Group is a certified NYSERDA provider that assists clients in securing financial incentives.
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