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Pricing a battery feasibility study as a consultant: what the research found

No published fixed fees for C&I battery feasibility studies were found in Germany, the Netherlands, the UK or Romania; consultancies quote individually. The proxies that exist are hourly and day rates: an average of €110 an hour across 207 German freelance profiles in energy supply, and €480–920 a day for interim energy engineers on one German platform. If a simple one-site study takes 2–5 engineer-days — Zorowatt's estimate, not validated — that puts it at roughly €1,000–4,500. Price it from your own days and the decision it supports, and write down exactly what is included.

5 min read · Updated 2026-10-30

What the research found

  • Published fixed fees for a C&I battery feasibility study: none, after searches in German, Dutch, English and Romanian. Consultancies quote individually.
  • German freelancers in the energy supply category: €110 an hour on average, across 207 profiles (freelancermap).
  • German interim energy engineers: €480–920 a day on one platform's city pages, which include the platform's markup (fratch).
  • Context for what businesses pay for subsidised energy advice in Germany: BAFA's programme for non-residential buildings has paid 50% of the fee since 7 August 2024, capped at €850, €2,500 or €4,000 by floor area (oekozentrum.nrw).
  • UK, Dutch and Romanian study fees: unavailable.

An estimate of the effort

Zorowatt's market research estimates 2–5 engineer-days for a simple study — one site, 12 months of 15-minute data, peak shaving and solar, an NPV — and rounds the day rate to €500–900: 2 × €500 = €1,000 at the low end, 5 × €900 = €4,500 at the high end. It is an estimate for orientation, not market data; your own time sheet is the better source.

What drives the days

  • Getting and cleaning the data: one of the three pains users raise most often, with trusting the results and modelling the tariff. Asking early saves days.
  • The tariff: reading the right version, and rebuilding the bill until it matches the invoices.
  • The number of scenarios: sizes, the 2028 Dutch draft, the German 2029 reform, solar, a grant.
  • The report and the meeting: a finance reader will ask about every assumption.

What the client is deciding

The study supports an investment far larger than its fee. Illustrative: a 300 kWh battery at €450 per kWh installed is €135,000; a €2,500 study is 2,500 ÷ 135,000 ≈ 1.9% of it. One UK source puts 100 kWh of commercial storage at £20,000–40,000 installed (Heatable).

Ways to price it

  • A fixed fee per site, with the data and the scope defined in advance.
  • Tiers by data: a quick screen from invoices; a full study on 12 months of 15-minute data; extra scenarios priced separately.
  • A day rate, with an estimate of days.
  • A first-step price for the data check and bill reconciliation alone, which can stand as a deliverable: an invoice error found is a result the client can act on.

What an offer should say

  1. What the client provides, with a deadline: the data checklist in What to ask your client for before a battery study.
  2. What you deliver: the data check, the rebuilt bill against the invoices, the sizes tested, the expected case and upper bound, the sensitivities, the report.
  3. What it is not: not a guarantee, not a bankable report, not an installer's design or protection study, not investment advice.
  4. How many revisions and meetings are included.
  5. The tariff versions and the date they will be checked.

Your tools are part of the cost

For comparison, HOMER Grid lists $4,200 a year on its annual plan (HOMER Grid pricing). Zorowatt's own plans are on the pricing page; whichever tool you use, divide its yearly cost by the studies you expect to run.

Frequently asked questions

Is there a market price for a battery feasibility study?
Not a published one. The research found only hourly and day rates, so any figure for a whole study is an estimate built from the days it takes.
Fixed fee or day rate?
A fixed fee is easier for the client to approve; it works when the data and scope are defined first. A day rate fits when the data is unknown. Another option is to price the data check first, then fix the rest.
Can I charge for the bill check alone?
Yes. A rebuilt bill reconciled with the invoices is useful in its own right, and an invoice error it finds is a finding the client can act on before any battery is discussed.
Does a tool make the study cheaper?
It can cut the days spent on data, tariffs and dispatch. Whether you pass that on in the price or keep the margin is a business decision; the scope and the honesty of the result should not change.

Related guides

Sources

Last checked: 2026-10-30. Every figure in this guide comes from the source linked next to it, with the retrieval date Zorowatt's research recorded (28–30 October 2026), or from arithmetic shown step by step. The 2–5 days and the €1,000–4,500 range are Zorowatt's own estimates; the €2,500 fee and the 300 kWh battery are illustrative.

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