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Welcome, founders! This page is your gateway to discovering valuable incubator and accelerator programs that can propel your startup to new heights. Here, you'll find a curated list of opportunities with upcoming application deadlines, designed to help you grow your business, refine your ideas, and connect with mentors and investors. Regularly check this page to stay informed about the latest programs that align with your startup's goals and stage of development.

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Accelerators & Incubators

<aside> CriticalMass

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Program Website

Program Length: N/A

Eligibility Criteria: Startup companies interested in deploying their TRL 8+ climatetech Innovations in Massachusetts

Due Date: September 22, 2025

Program Details:

• Provides up to $1,000,000 in grant funding
• Offers specialized services and partner matchmaking
• Supports commercial deployment projects addressing decarbonization challenges
• Focus on growing Massachusetts’ clean energy economy and leadership

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Third Derivative Accelerator Program

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Program Website

Program Length: 18 months (virtual)

Eligibility Criteria: Climate tech startups with significant climate impact potential

Due Date: May 5, 2025

Program Details:

• 18-month virtual accelerator program focused on helping advanced technology startups bring innovations to market
• Provides connections to investors, corporate partners, market experts, and mentors
• Aims to accelerate commercialization and bridge gaps to financing and resources
• Focus on sectors: Built Environment, Electricity, Fuels and Chemicals, Materials and Industrial Manufacturing, Resource and Climate Management, Transportation and Mobility

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Spark Cleantech Accelerator

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Program Website

Program Length: 12 weeks (Aug. 25, 2025 - Nov. 20, 2025)

Eligibility Criteria: Early-stage cleantech entrepreneurs

Due Date: May 16, 2025

Program Details:

• $15,000 stipends to help with travel/living costs and support business and technical milestones
• Prototyping services through the University of Tennessee’s Center for Materials Processing
• Mentorship in business, market analysis, IP strategy, product design, engineering, and manufacturing
• Connections with customers, investors, strategic partners, and universities/national labs + partnership opportunities with Tennessee Valley Authority, Oak Ridge National Lab, and others

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Thriving Communities: Climate Resilience US

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Program Website

Program Length: N/A

Eligibility Criteria: Early-stage startups developing solutions for climate resilience and low-income communities

Due Date: May 9, 2025

Program Details:

• Equity-free accelerator supporting 10 startups focused on climate resilience and uplifting low-income communities
• Access to Village Capital’s investment-readiness curriculum and on-demand coaching from an Investment Analyst
• Mentorship from investors and climate-focused subject matter experts
• Two startups eligible for investment capital at the end of the program

Fellowships

<aside> Climatebase Fellowship

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Program Website

Program Length: 12 weeks + Annual Community Membership

Eligibility Criteria: Climate-focused professionals and career transitioners

Due Date: February 14, 2025

Program Details:

• Industry-oriented educational program
• Expert guest speaker sessions
• Career support and guidance
• Project-based learning opportunities
• Access to network of talented peers
• Ongoing community membership benefits

Ongoing Programs with Rolling Applications