DurationX
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Before you commit millions to long-duration storage,
find out if the assumptions are CAPEX-ready.

DurationX is a vendor-independent, human-reviewed pre-CAPEX assumption readiness audit for long-duration energy storage. It identifies weak duration, CAPEX, technology-class, and reliability assumptions before vendor selection.

DurationX does not tell you which system to buy. It tells you whether the assumptions behind the decision are strong enough for the next diligence step — and if not, which evidence to strengthen first.

Request CAPEX Readiness AuditSee Sample Decision Brief

No vendor commissions. No supplier ranking. No procurement advice. Assumption audit only.

Why this can be trusted

Deterministic scoring
For a pinned intake, dataset, rubric, rules, and normalization inputs, the numeric scoring calculation is deterministic.
Human-reviewed before release
Before release, a person checks the report for input-to-output consistency, source/provenance display, prohibited claims, unresolved compliance flags, calculation reconciliation, and document integrity.
Vendor-independent
DurationX does not sell storage systems, rank vendors, accept supplier referral fees, or receive commissions from technology suppliers.
Independently verifiable
Every report is Ed25519-signed and re-hashed on demand — check any report’s authenticity yourself.
Verify a report →

What you receive

Every audit produces a single reviewed decision brief, delivered by 18:00 CET/CEST on the third business day after complete intake acceptance. One project. One location. Up to five scenarios.

Teams use it to decide whether to proceed, pause, or strengthen specific evidence before deeper diligence — with a verifiable record of what was assessed and against which benchmark versions.

Readiness + Confidence
A 0–100 readiness score with a four-band outcome label, and a separate confidence band for how well the intake supports its claims. Never blended.
Benchmark Position
Your declared timeline and CAPEX placed against versioned public benchmark data — with the source, sample window, and reference for every comparison.
Path to Ready
The ranked evidence gaps with the most readiness points at stake, the distance to the next readiness band, and what evidence a re-audit would assess first.
Assumption Failure Map
Top three assumption weaknesses, each with why it is weak and how much readiness it costs.
Scenario Intelligence
Up to five scenario comparisons — duration alternatives, technology-class alternatives — plus a CAPEX stability check against your own declared low/base/high range.
Investment Committee Memo
Decision-language memo with the recommendation, the primary constraint, and the open question for the committee — ready for the next diligence step.

Report sections

  1. 1.Project Snapshot
  2. 2.Readiness and Confidence
  3. 3.Top Assumption Failures
  4. 4.Scenario Comparison
  5. 5.Technology-Class Implication
  6. 6.Required Next Inputs
  7. 7.Investment-Committee Memo
  8. 8.Disclaimer and Provenance

Plus Appendix: Sources · Verification.

Every report follows this fixed eight-section contract, capped at five pages, with a signed verification reference checkable at /verify.

Vendor-independent by design

DurationX does not sell storage systems, rank vendors, broker procurement, or receive supplier commissions. Findings describe assumption readiness only. Decisions remain the responsibility of the customer and its advisors.

Methodology and sources

The scoring rubric compares customer-provided assumptions against a versioned public benchmark set drawn from PNNL grid energy storage cost and performance databases, NREL Annual Technology Baseline, and DOE public reports. Every report footer cites the exact dataset, rubric, prompt, and template versions used, plus a verification reference for independent authenticity checks.

Read the methodology →Verify a report →

How it works

  1. 01Qualification. Short fit form. A reviewer confirms scope within one to two business days.
  2. 02Payment. $1,000 fixed. Paddle handles billing.
  3. 03Intake. Structured project details. The SLA clock starts only after intake acceptance.
  4. 04Analysis. Deterministic scoring against the versioned benchmark, then narrative review.
  5. 05Human review. Every report is manually quality-checked before release.
  6. 06Delivery. Reviewed decision brief, verifiable via /verify.
  7. 07After delivery. Close the required inputs and re-audit the same project as its evidence matures, or bring the next project. Each audit covers one project, one location — by design.

Frequently asked questions

What is DurationX?

DurationX is a vendor-independent, human-reviewed pre-CAPEX assumption readiness audit for long-duration energy storage. It identifies weak duration, CAPEX, technology-class, and reliability assumptions before vendor selection.

What do I get for $1,000?

One reviewed decision brief for one project at one location (up to five scenarios), delivered as a signed PDF by 18:00 CET/CEST on the third business day after complete intake acceptance, including a Path to Ready roadmap and a verification reference checkable at durationx.com/verify.

What is DurationX not?

It does not recommend vendors, rank suppliers, or give procurement, investment, legal, or tax advice, and it does not guarantee project outcomes. It audits whether the assumptions behind the decision are strong enough for the next diligence step.

Is the sample a real client report?

No. The sample is a worked example built on a clearly-fictional project fixture, run through the same scoring workflow every paid audit uses.

Can I verify a delivered report?

Yes. Every report is Ed25519-signed; the verification page re-hashes the document and checks the signature.

How do I start?

Submit the qualification form. DurationX reviews whether the project fits the published 10–100 hour long-duration storage scope and current country coverage. If it fits, you receive a payment link; delivery is by the third business day after your intake is accepted.

How do I access my report again later?

Your account is created automatically when payment completes — there is no password to set. To return any time, go to durationx.com/signin, enter the email you paid with, and we send a fresh sign-in link. Every past report stays available there for 24 months after delivery (see the Privacy Policy for the full retention schedule).