Powering confidence with accurate energy billing
Optii independently recalculates every charge on every meter and compares it with what your supplier billed. You get evidence when a bill is wrong and confidence when it's right.
Your bills and data
- Half-hourly data
- PDF invoices
- EDI files
- CSV files
- Supplier portals
- Meter reads
Optii and our services
- Optii
- OptiiParse
- OptiiSnap
- OptiiLive
- Portfolio Services
- Bureau Services
Problems we catch
- Wrong unit rates
- Network charge errors
- Duplicate charges
- Estimated reads
- Levy and tax errors
- Out-of-date account data
Plus dozens more checks on every bill
£9,158.55 found on a demo invoice See it rebuiltTrusted by
New from Optima
Two new Optii products, a dedicated portfolio service and a partner programme.
See every file the moment it lands.
OptiiLive puts your whole billing pipeline on one screen: what has arrived, what processed first time, which suppliers send poor-quality files and how much is still outstanding.
- First-time processing rate, file by file
- Supplier file quality at a glance
- Outstanding discrepancy, in pounds
Inside Optii: the live launch webinar
Friday 16 October 2026, 12:30pm (UK time) · Online, on Microsoft Teams
Join our team for a live walkthrough of everything on this page: how Optii recalculates every bill, the new OptiiLive and OptiiSnap products, Portfolio Services and the Partner Programme, and how to prepare for half-hourly settlement. Bring your questions.
Registration is on Microsoft Teams.
Energy bills are too complex to take at face value.
Multiple suppliers, thousands of meters, changing tariffs, network charges, levies and flexible wholesale pricing. Somewhere in that detail there could be a charge you shouldn't be paying.
And the rules keep changing. Market-wide half-hourly settlement, network charging reform and shifting levies all change how your bills are calculated.
energy bills we recalculated failed an Optima accuracy check.
Every bill builds on the last.
We don't just read the bill. We recalculate it against a foundation of your contracts, meters and rates, and every validated bill extends that foundation for the next one.
- FoundationYour sites, meters, contracts and rates, set up once and kept up to date as your portfolio changes.
- RecalculateEach bill is collected from your suppliers and every charge rebuilt against that foundation and the published rates.
- Flag and actDiscrepancies come with the evidence attached, so you can challenge the supplier and recover the money.
- Carry forwardValidated reads, consumption and resolved queries become part of the record, so each bill is checked against more history than the last.
- Jan–MarValidated
- Apr–Jun1 query resolved
- Jul–SepValidated
- Oct–Dec2 flags
Recalculated, not just checked
Invoice INV-4471-A · Oct–Dec · demonstration data
Recalculates every line against the contract and the published charges.
| Charge line | Charged | Expected | Difference |
|---|
Not recalculated yet.
Every line of every bill.
Every bill runs through dozens of validation checks, and every charge is recalculated line by line. Each check is traced back to your contract, your meter data and the published rates, so every flag comes with evidence.
- Tariff recalculation Unit rates, standing charges, capacity, reactive power, maximum demand and flexible wholesale costs, rebuilt from your contract and the published rates.
- Network charges DUoS, TNUoS and BSUoS, checked against the right tariff, banding and loss factors.
- Levies and taxes RO, FiT, CfD, Capacity Market, AAHEDC, EII and Nuclear RAB levies, plus CCL and VAT against your account history and de minimis rules.
- Consumption and reads Billed against calculated consumption and half-hourly data, estimated and missing reads, and gas calorific values.
- Capacity and demand Load factor, maximum demand, agreed capacity and Triads.
- Duplicates and payment history Duplicate bills, periods already paid, reused bill numbers and invoices already in suspense.
- Cost and period tolerances Exceptional costs, minimum and maximum invoice cost, baselines and billed days.
- Account and meter set-up Unknown accounts, closed sites, expired contracts, MPAN and MPRN mismatches and unlinked charges.
Electricity half-hourly and non-half-hourlyGas including transportation chargesWater and sewerage including trade effluentPlus other utilities and emerging technologies
Two ways to work with Optima.
Run bill validation yourself on the Optii platform, have our specialists run it for you, or combine the two.
The Optii platform
Software your team runs: one engine and one set of validated data behind five connected products.
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OptiiValidate your bills across every site and meter with confidence.
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OptiiLiveOne screen for complete end-to-end visibility across every file.
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OptiiParseAI that turns PDF bills into structured data, with 99% extraction accuracy.
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OptiiSnapActual reads, not estimates, directly into Optii.
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Carbon reportingScope 1 and 2 emissions reporting from the same validated data.
Managed services
A team of specialists who run the work for you, every step of the way.
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Portfolio ServicesYou tell us what changes across your portfolio. Our dedicated team keeps every account, contract, rate and meter up to date, fixing issues before they slow down validation or supplier queries.
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Bureau ServicesYou send us bills and data. Our team runs collection, validation and supplier queries for you.
Two services, one complete picture
Portfolio Services keeps the record of what you have. Bureau Services checks what you're charged for it. Together they give you the whole picture in Optii.
Independent by design, technology first: accurate energy data at scale.
We don't sell energy, procurement or brokerage. Our only interest is making sure your bills are accurate. That's 30 years of billing expertise working for you, not for a supplier.
- Since 1995independent bill validation, with nothing else to sell
- Every chargerecalculated line by line, across electricity, gas and water
- ISO 27001certified information security
Built for complex, multi‑site portfolios with significant energy spend.
- Retail and hospitality
- Public sector
- Facilities management
- Property and housing
- Energy consultants and TPIs
Earn on every client you introduce.
Partners earn up to 20% of first-year ARR. You procure, we validate, and Optima sells and delivers the service end-to-end.
See Optii check your own bills.
Book a demo and we'll show you Optii working on your own data.
Frequently asked questions
Can Optima manage multiple sites?
Yes. Optima is built for complex portfolios: many sites, meters and suppliers in one view.
Can you validate flex tariffs?
Yes. We reconcile invoiced rates against your traded tranches, shape, imbalance and pass-through costs.
Can we use our data in other systems?
Yes. More than 200 documented, versioned API operations give you full access to your data, so Optii integrates easily with third-party systems and your own internal data teams.
How do you keep our data secure?
Optima is ISO 27001 certified, the international standard for information security management. Your data is handled under our privacy policy.
Do you replace our energy broker?
No. We validate bills. We don't compete for your energy contract.
How do we get started?
Book a demo. We'll review your portfolio and show you what Optima finds in your own data.