ISEF Reopens October 21, 2025, for Small Fleets

September 22, 2025

The Innovative Small E-Fleet (ISEF) Set-Aside within the Clean Truck and Bus Voucher Incentive Project (HVIP) reopens on October 21st with $30.5 M in available incentives. 

With ISEF, small fleets (20 or fewer vehicles and under $15 million annual revenue) can access enhanced vouchers for zero-emission vehicle rentals, leases, truck-sharing, and other flexible agreements.

CARB has released Appendix F of the Fiscal Year 2024-25 Implementation Manual, detailing all program updates that take effect on September 22, 2025.

Key Changes

• Enhanced Voucher Levels: New small business voucher amounts take effect on September 22, 2025, for all requests.
• Purchase Plus: (Available when HVIP is closed) Combine straight purchases with pre-approved additional services. Services must be approved by CARB and the ISEF administrator before submitting requests.
• Residential Domicile: Small fleets using residential addresses must submit a commercial use letter to [email protected] with their voucher requests.
• Voucher Limits: Fleets may request up to five ISEF innovative vouchers per funding cycle, while Purchase Plus vouchers are limited to five per fleet (all-time total, not annually).
• Proof of Business Standing: Small fleet participants are required to be registered with the California Secretary of State for at least one year prior to voucher request. Alternate proof of business standing can be provided on a case-by-case basis, except under the Purchase Plus solution – which will follow HVIP straight purchase requirements.

How to Prepare for the ISEF Reopening

For Fleets:

• Find approved provider in the ISEF Provider Directory
• Work with your provider to access vouchers for rentals, leases, or truck-as-a-service agreements

For Providers:

• Coordinate with HVIP-eligible dealers to request vouchers for your fleet customer
• New providers: Complete the Provider Eligibility Application or email [email protected]

Need Support?

• Cal Fleet Advisor: Free technical assistance for operational, financial, and infrastructure planning
• ISEF Team: Email [email protected] for program questions

Get Ready – ISEF Opening and Overview Webinar

To prepare for ISEF reopening, join us for a free webinar on Wednesday, October 9, to learn about program changes and their impact on your business.

• Date: Wednesday, October 9, 2025
• Time: 10:00 AM – 11:00 AM PST
• Location: Zoom Webinar

Register Now

Project Background

About ISEF: ISEF supports small fleets and owner-operators in adopting zero-emission vehicles by offering flexible solutions such as all-inclusive leases, peer-to-peer truck sharing, truck-as-a-service, and other alternative business models. ISEF helps small fleets overcome barriers like high upfront costs and infrastructure challenges, while supporting California’s clean transportation goals. Learn more by visiting the ISEF page.

Thank you for your continued participation in HVIP and your commitment to clean transportation in California.

The HVIP Team