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Celsari

Federal rules to meet. Federal money to claim.

Celsari helps municipalities, school districts and nonprofits with three federal matters that run on deadlines: accessible public documents, refunds for clean energy projects, and ARPA closeout. We do the legwork and put the right professional in front of every decision.

Dates that matter

  1. Oct 31, 2026Third-quarter 2026 ARPA Project and Expenditure report is due to Treasury. Treasury
  2. Nov 16, 2026Clean energy refund return or extension is due for a tax-exempt owner with a July to June tax year and a project placed in service July 2025 to June 2026. See all dates
  3. Dec 31, 2026ARPA funds must be spent. Unspent funds return to Treasury. Treasury
  4. Apr 26, 2027ADA web accessibility rule applies to governments serving 50,000 people or more. ADA.gov
  5. Apr 26, 2028Same rule for governments serving fewer than 50,000 people, and special districts.

Three services, one desk

The clerk, manager or finance director who handles one of these usually handles the other two. Each is driven by a rule or a deadline, and each is mostly organizing, checking and paperwork, which is what we do.

Document accessibility

Due April 26, 2027 or 2028

The ADA rule requires the PDFs on your website to be readable by people with disabilities. We rebuild your current agendas, minutes, forms and notices, set up templates so new ones come out right, and keep a record of the work.

Document accessibility

Clean energy refunds

Filing season runs through spring 2027

Tax-exempt and government owners of solar, battery storage and EV charging projects can claim the federal credit as a direct payment. We find the projects, organize the paperwork and bring in a licensed tax preparer.

Clean energy refunds

ARPA closeout

Spend by December 31, 2026

ARPA dollars not spent by the deadline go back to Treasury. We map the balances at risk and prepare the documentation to move them to eligible projects within Treasury’s rules, then help with final reporting.

ARPA closeout

We do the legwork. The right professional makes the call.

Federal rules reward careful paperwork, and they punish guesses. So we stay in our lane and say plainly where it ends.

We never ask for your passwords. Anything that goes to the IRS or to Treasury is reviewed and submitted by your own people or by the licensed professional who signs it.

Who does what
MatterCelsariDecided and signed by
DocumentsInventory, triage, repair, templates, reportYour staff post the files and decide what to archive
Clean energy refundsFind projects, gather and organize documents, keep the calendarA licensed tax preparer determines the credit, prepares, signs and files the return
ARPAReconcile balances, draft the plan and the written justification, prepare portal entriesYour finance director reviews and submits; your auditor or counsel reviews larger moves

Who is behind Celsari

Celsari is a service of RevHarvester LLC, a Maine company based in Portland. It is run by Matt Garbarino, who builds software that turns public records and published rules into plain, checkable work. We began with documents, because we measured the problem: in a first scan of 284 local government websites in Vermont, Maine and New Hampshire, 87% of the PDFs we tested failed a basic accessibility check. The refund and ARPA services followed because the same offices carry all three deadlines.

We would rather tell you we cannot help than sell you something you do not need. If your ARPA funds are already spent, or your project does not qualify, we will say so.

Not sure which of these applies to you?

Tell us about your municipality, school district or organization. We will tell you honestly whether we can help, and what to ask your own advisers if we cannot.