How to bid on Greenhouse Gas Inventory Verification for the City of Seattle

What the City of Seattle is buying

The City of Seattle is looking for proposals from vendors to provide greenhouse gas inventory verification services. This work specifically covers verification for California, Washington, and The Climate Registry. This is an opportunity for firms specializing in environmental compliance and reporting to work with a major city.

Key dates and what happens at the deadline

This Request for Proposals (RFP) was published on August 28, 2026. All proposals must be submitted by September 18, 2026, at 7:00 PM ET. Proposals received after this exact time will not be considered.

All questions regarding this solicitation must also be submitted through the Seattle e-procurement portal. The description does not provide a specific deadline for questions, so it is advisable to submit them as early as possible.

Who this opportunity suits

This opportunity is suitable for environmental consulting firms, auditing companies, or specialized service providers with expertise in greenhouse gas inventory verification. Vendors should have experience with regulatory frameworks in California and Washington, as well as The Climate Registry protocols. The category for this work is environmental services.

How to respond to this solicitation

To respond, you must access the opportunity through the City of Seattle's e-procurement portal. First, locate the original source of the solicitation. The portal may perform a brief security check; allow it to complete.

You will need to sign in or create a free vendor account on the OpenGov Procurement portal. This account will allow you to download all necessary plans and documents, submit any questions you have, join the list of planholders to receive updates, and ultimately submit your proposal before the deadline. Addenda and other notices will be sent through this portal.

Tips for preparing a competitive response

When preparing your proposal, clearly demonstrate your firm's experience with greenhouse gas inventory verification, particularly in the specified regions and with The Climate Registry standards. Highlight any certifications or accreditations your team holds relevant to environmental auditing and compliance.

Ensure your proposal directly addresses all requirements outlined in the solicitation documents. Pay close attention to the submission instructions on the e-procurement portal to avoid any technical issues. Proofread your entire submission carefully for clarity and accuracy before the deadline.