Before vendor selection or deeper technical diligence,
test whether your long-duration storage assumptions hold up.

Is this for you?

Who is this for?

Energy consultants and storage developers with live project flow, small infrastructure investors and family offices, and teams preparing investment-committee material — anyone who repeatedly screens long-duration storage projects and wants to avoid spending senior reviewer time on a weak one.

At what project moment should it be used?

Before you issue a vendor or RFP brief, before you commission paid technical or financial diligence, and before an assumption file goes to an investment or steering committee — while duration, CAPEX, grid-timeline, and technology-class assumptions can still be revised cheaply.

What exact artifact is delivered?

One reviewed decision brief plus supporting appendix, as a signed PDF and an authenticated online drill-down of the same report and version. See “What you receive” below.

What will it not decide?

Which vendor to choose, whether the project is bankable, whether it will hit a target return, or whether you should invest. DurationX audits assumption readiness — it does not replace your own investment or engineering judgment.

Why not use an internal checklist?

A checklist does not cross-check your own numbers against each other, test them against versioned public benchmark data, or produce a signed, reproducible record your next reviewer can trust without redoing the work. This runs the same disclosed protocol every time.

Why act before detailed diligence?

Technical and financial diligence is expensive and slow to arrange. Fixing a weak duration, CAPEX, or technology-class assumption before that engagement starts is faster and cheaper than discovering it midway through — or after — a specialist review.

Why this can be trusted

Trust and accountability

Who operates DurationX, what a report review actually checks, and how any delivered report can be independently checked — in one place.

Operator

Dijin Teknoloji Limited Şirketi, trading as DurationX (Ankara, Türkiye), is the contracting party under the Terms of Service and the data controller under the Privacy Policy for every DurationX audit.

Human review

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. This quality-control review is not an engineering review, investment recommendation, legal opinion, safety certification, or independent verification of every customer-provided fact.

Vendor independence

DurationX does not sell storage systems, rank vendors, accept supplier referral fees, or receive commissions from technology suppliers. The benchmark may include public, licensed, and clearly identified supplier-originated evidence; supplier-originated evidence is labeled and does not become "independent" merely because DurationX uses it.

Sources and benchmarks

The benchmark set is drawn from public techno-economic sources first — PNNL Grid Energy Storage Cost and Performance, NREL Annual Technology Baseline, and DOE public reports — before any customer-provided input, which is always the audit subject and never a benchmark source.

Report security

Reports are kept in private storage and downloaded only through short-lived, server-signed links. Report metadata is signed with Ed25519 over a SHA-256 hash of the delivered PDF, and anyone can re-check that signature at /verify.

AI role

Numeric scoring is deterministic and version-pinned; no AI is involved in that calculation. Narrative explanations are produced under a version-pinned AI process — the model, prompt, and template versions are recorded on every report — and are reviewed by a person before release.

Independent methodology review

Independent methodology review pending. The identified methodology, rubric, compiler rules, and benchmark dataset version have not yet been reviewed by an independent energy-storage subject-matter reviewer. This page will be updated with the reviewer identity, review date, covered versions, scope, and any conditions or exceptions once that review is complete and recorded.

Full contractual and privacy detail: Terms of Service · Privacy Policy · Security & Data Handling · Methodology. Support and security contact: support@durationx.com.

What the audit tests

Every audit runs the same disclosed, versioned control register — thirteen checks against your submitted assumptions and the active benchmark set. Each control resolves to supported, conditional, unsupported, or not evaluable; none are skipped to make the findings look larger.

1. 01Required-assumption completeness. Confirms every required assumption field is declared, present, or explicitly marked pending.
2. 02Unit and range validity. Confirms declared power/duration/CAPEX figures use a consistent unit basis and produce a coherent normalized value.
3. 03Cross-field consistency. Confirms the interconnection capacity and value-stream declarations are internally consistent with the declared target power and streams.
4. 04Technology, use-case, and duration coherence. Confirms the declared target duration is coherent with the selected technology class's benchmarked duration range.
5. 05CAPEX scope, range, and benchmark applicability. Confirms the declared CAPEX range is complete, internally ordered, and — where evaluable — positioned against a matched public benchmark duty point.
6. 06Reliability and cycling coherence. Confirms the declared reliability requirement and cycling pattern are coherent with the selected use case and the technology class's benchmarked life data.
7. 07Grid and timeline benchmark applicability. Confirms the declared grid/interconnection timeline is internally consistent and, where evaluable, positioned against benchmarked interconnection lead times.
8. 08Delivery and procurement evaluability. Confirms the declared procurement/delivery timeline is internally consistent and, where evaluable, positioned against benchmarked procurement lead times.
9. 09Evidence origin and substantiation status. Confirms every material finding's evidence trail is visible, typed, and dated where applicable, with no evidence overstated as independently verified.
10. 10Project-exception traceability. Confirms a declared benchmark exception carries a rationale, a declared evidence origin, and an exact evidence request to close it.
11. 11Scenario robustness and recalculation. Confirms comparison scenarios are only shown when they produce a decision-relevant change versus the baseline, recomputed through the same benchmark path.
12. 12Score, issue, memo, source, and PDF reconciliation. Confirms every customer-visible priority (top failures, required next inputs, roadmap) resolves to a real, traceable finding, and that the delivered PDF's hash and signature match the persisted record.
13. 13Prohibited-claim and document-integrity review. Confirms the delivered narrative contains no prohibited claim or phrasing, and that the document's hash and signature are independently re-checkable.

Every check behind these 13 categories already runs on each delivered report; the itemized, control-by-control register shown here becomes part of the authenticated drill-down described under “What you receive” below as this report-format version activates.

See it worked end-to-end

The worked sample follows one declared CAPEX assumption from its evidence, through its benchmark position, to its logged exception and the exact next evidence that would close it — the same chain every paid audit produces for your own project.

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.

You receive a signed PDF decision brief, plus an authenticated online drill-down of the same report and version — control register, evidence manifest, and scenario detail included.

It supports a proceed-to-diligence, revise-assumptions, or gather-more-evidence discussion — never a go/no-go investment decision — with a verifiable record of what was assessed and against which benchmark versions.

Benchmark coverage varies by technology class, country, and metric. Every case a control cannot evaluate is disclosed as not evaluable — never guessed and never a silent penalty. Current coverage: see active sources and data coverage.

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.

Price, SLA, and how to request

$1,000 fixed covers the full audit protocol for one project at one location, up to five scenarios: input normalization and cross-field reconciliation, benchmark-applicability and CAPEX/timeline control checks, project-exception handling, scenario recalculation against the same benchmark path, evidence-and-issue reconciliation across every surface, and mandatory human quality control.

You receive a signed PDF decision brief, plus an authenticated online drill-down of the same report and version — control register, evidence manifest, and scenario detail included. The delivery SLA (18:00 CET/CEST on the third business day) starts only once your paid intake is submitted and accepted as complete — not at the moment of payment.

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. A re-audit is a new audit at the current published price; a confirmed DurationX defect is corrected without charge.

Frequently asked questions