Best data room for selling a battery storage project (October 2026, 6 we priced)
If a bank runs the auction, use its room, usually Datasite or Intralinks. The index matters more than the vendor. A developer selling all year uses a published-price room with one audience per bidder. This is our list of 6. Each row is the job that vendor actually wins.
Best data room for selling a battery storage project (definition). The room that matches the process: the banker’s Datasite or Intralinks room if a bank already runs the sale, or a published-price room with one audience per bidder if the developer does.
The index of site control, interconnection, offtake and tax-credit basis matters more than the logo. A Drive folder is not a diligence room for several IPPs.
How we tested
We read Fastio’s own pricing page on 2026-10-02. Yearly billing is selected by default on that page. We read Firmex’s renewable-energy industry page on 2026-10-02. The other published dollars reuse constants last read on 2026-10-02. A published number is quoted as published. Quote-only stays quote-only. No price here comes from a review site. If a vendor moves a figure after that date, believe their page.
What the buyer actually asks for is what documents a buyer needs for a solar or battery storage project acquisition.
What each data room costs a battery-storage project sale
| Tool | Published price (dated) | Job it wins | Ceiling |
|---|---|---|---|
| Datasite / Intralinks (the banker's room) | Quote-only. Datasite's cost FAQ has no public dollar (retrieved 2026-10-01). Intralinks cost guide is quote-only (retrieved 2026-10-01). | The banker-run auction. The name and the Q&A routing that bank already uses. | No public dollar. A second room in parallel is how versions drift. |
| Firmex | Quote-only. GET A QUOTE, per-project or subscription (firmex.com/pricing, retrieved 2026-10-01). | A developer selling all year. Firmex's renewable-energy page covers M&A, financing, RFP, NTP-related audits and joint ventures, with unlimited self-serve projects and unlimited external users (retrieved 2026-10-02). | No public dollar. Up to 50 GB drag-and-drop uploads on that page. SOC 2 and HIPAA are claimed on Firmex's own renewable-energy page. |
| Ansarada | 50 MB Essentials $69/month on a 12-month term; 20 GB $5,134/month on a 12-month term (ansarada.com/article/pricing-guide, retrieved 2026-10-02). | A published storage-based card that can sit unused until the interconnection agreement or toll is signed. | Storage tiers. The 12-month term is the figure quoted; monthly billing is higher on that same guide. |
| iDeals | Quote-only. Get price on every tier (retrieved 2026-10-01). | A traditional quote-based VDR with a public tier list. | No public dollar. |
| Fastio | Yearly billing is the page default. Starter $9.99/month or $99/year (3 seats, 250 GB); Business $49.99/month or $499/year (10 seats, 5 TB); Enterprise $199.99/month or $1,999/year (30 seats, 25 TB) (fast.io/pricing/, retrieved 2026-10-02). | A published-price AI workspace a developer can open without a quote. | Seats, storage and monthly credits. Enterprise lists single sign-on. Not the banker's auction room. |
| Cashpian Standard | $100 / mo per company, or $1,000 / yr. Unlimited rooms, viewers and documents, no seats. | One audience per bidder, Q&A private to each buyer until published, NDA signed at the door, watermarks, per-file download control, per-buyer page logs, and a checklist built from the buyer's own request list. | KMZ, shapefile, DWG and native engineering files cannot be uploaded; share PDF exports. Not a marketplace. No SOC 2, no SSO, no white label, no CRM. Not the name a banker's process already uses. |
Situation → pick
The table above is the dated prices. This one is the decision.
| If this is the sale | Pick | Do not pick |
|---|---|---|
| A bank already runs the process on Datasite or Intralinks | That banker's room | A second room in parallel. |
| A developer selling projects all year, several IPPs bidding | Firmex, or a published-price room with one audience per bidder | One Drive folder forwarded down the chain. |
| The room will sit unused until the IA or toll is signed | Ansarada | A storage cap you will cross mid-process. |
| Counsel or the buyer asks for iDeals | iDeals | A second room in parallel. |
| A published dollar without a quote, for working files | Fastio | Fastio as the banker-run auction room. |
| Owner-led, several bidders, one company line | A published-price room with one audience per bidder | A room that cannot take PDF exports of site plans and single-line diagrams. |
Where a published-price company room fits
A company-priced room is one line for the sale. Cashpian Standard is $100 / mo per company, or $1,000 / yr, with unlimited rooms, viewers and documents and no seats. See pricing.
Each bidder gets its own audience. A published answer reaches only that bidder. The NDA is signed at the door, with a certificate per signer. Watermarks and per-buyer page logs show who is actually working the file. KMZ, shapefile, DWG and native engineering files cannot be uploaded; the developer shares PDF exports of site plans, single-line diagrams and study reports. See What is Cashpian?
FAQ
If my banker already has a Datasite room, should I open a second one?
No.
Use that banker's room.
Datasite and Intralinks win the banker-run auction.
A second room in parallel is how versions drift.
Is Firmex built for renewable-energy developers?
Firmex publishes a renewable-energy industry page for M&A, financing, RFP, NTP-related audits and joint ventures.
Quote-only. Unlimited self-serve projects and unlimited external users, on that page.
Does Fastio replace a diligence room?
Fastio publishes prices for an AI workspace with seats and storage.
It wins a public dollar without a quote.
It is not the banker's auction room.
Which published-price room keeps competing bidders apart?
Any dedicated room that gives each bidder its own audience and its own Q&A thread.
A Drive folder and a forwarded Fastio link do not.
The setting, not the logo.
Sources
- Datasite, How much does Datasite cost?, retrieved 2026-10-01. No public dollar.
- Intralinks, How much does Intralinks cost?, retrieved 2026-10-01. Quote-only.
- Firmex, Firmex for Renewable Energy, retrieved 2026-10-02. M&A, financing, RFP, NTP-related audits, joint ventures. Unlimited self-serve projects. Unlimited external users. Up to 50 GB drag-and-drop uploads. SOC 2 and HIPAA claimed on that page.
- Firmex, pricing, retrieved 2026-10-01. GET A QUOTE. Per-project or subscription.
- Ansarada, pricing guide, retrieved 2026-10-02. 50 MB Essentials $69/month on a 12-month term; 20 GB $5,134/month on a 12-month term.
- iDeals, pricing, retrieved 2026-10-01. Get price. No public dollar.
- Fastio, pricing, retrieved 2026-10-02. Yearly billing selected by default. Starter $9.99/month or $99/year. Business $49.99/month or $499/year. Enterprise $199.99/month or $1,999/year.
- Cashpian, pricing. One company line from the public catalog. Unlimited rooms. Not per seat.
If the files are already in a folder, grade which row they are on. Cashpian is a gated room for that packet. It is not a listing portal. It does not sell the company or run the deal.