Is your business ready for MHHS? Here’s the full checklist

You might not have heard much about MHHS yet, but it’s coming. And it will change how your business is billed for electricity.

MHHS stands for Market-wide Half-Hourly Settlement. It’s a national programme that will soon require all electricity suppliers to settle energy use based on actual half-hourly data, rather than estimates.

It sounds technical. But here’s the simple version: if your business has a smart meter or an advanced meter, you’ll likely be affected. And while the final rollout deadline isn’t until December 2026, the way you manage energy today could affect how ready you are and how much control you have when it happens.

This checklist walks you through what to review, what to change, and how to get ahead.

Your MHHS Transition Checklist

1. Check if your meter is MHHS-ready

Not every electricity meter can record and send half-hourly usage data. MHHS depends on accurate data from your meter, so this is one of the first things to get clear.

There are three common situations:

• Already HH settled (Profile Class 00) - no change needed.
• Smart or AMR meter installed, but still on a profile. Your meter likely supports HH data, but billing and data services will need to change.
• Older or legacy meter. If your meter can’t record half-hourly data, you’ll need to upgrade before the deadline.

Why it matters for MHHS: Without a compliant meter, you won’t be able to move to half-hourly settlement, and you could face delays or extra costs if you leave this too late.

2. Understand your MPAN and profile class

Your MPAN (Meter Point Administration Number) includes a code that shows how your site is currently settled.

Look for:

• 00 – already HH settled
• 05–08 – advanced meters that must be HH settled
• 03/04 – non-HH meters that may need upgrading

If you’re not sure, check your latest bill or ask your energy partner to confirm.

Why it matters for MHHS: Knowing your profile class helps you understand how ready you are and what needs to change.

3. Review your contract and pricing structure

Half-hourly settlement will change how your energy charges are calculated. That means your existing contract may not be set up to reflect your true usage patterns.

Look out for:

• Pricing based on estimated usage rather than HH data
• Tariffs that don’t reward flexible usage
• Terms that may need renegotiating once MHHS goes live

Why it matters for MHHS: Contracts that don’t reflect half-hourly data may become outdated or less cost-effective. Getting ahead now could help you avoid mid-contract changes or missed opportunities.

4. Start accessing your half-hourly data

MHHS is based on actual half-hourly usage, not estimates. If your business has a smart or AMR meter, it’s likely already recording this data, even if you’re not billed on it yet.

Ask your supplier or energy partner for access. It’ll show you:

• When your energy use peaks
• Where you might be wasting energy
• If there are gaps or irregularities in your data

Why it matters for MHHS: Once MHHS goes live, this data will directly affect how you’re billed. Reviewing it now helps you avoid surprises and gives you time to adjust.

5. Plan for demand flexibility

Half-hourly data unlocks the chance to reduce costs by shifting usage away from peak times.

Once MHHS is in place, suppliers can offer:

• Flexible or time-of-use tariffs
• Savings for off-peak usage
• Contracts that reflect real usage patterns

Simple changes, like moving some processes to off-peak hours, could make a big difference.

Why it matters for MHHS: The system is designed to reward flexibility. The sooner you plan for this, the better you’ll be able to take advantage of it.

6. Make sure your data services are MHHS-ready

MHHS brings changes to how your data is handled. That includes new or updated roles for:

• Data Collectors and Aggregators
• Metering agents
• Other third-party service providers

Some older setups may no longer meet the new requirements, and your supplier or consultant may need to update your arrangements.

Why it matters for MHHS: Even if your meter is ready, poor data handling can lead to errors, delays, or extra costs under the new system.

7. Speak to your finance team

More detailed data can mean more variable bills, especially if your usage peaks during high-demand periods.

Finance teams should prepare for:

• Greater variation in monthly charges
• Budget forecasting based on actual usage patterns
• Potential new tariff structures

Why it matters for MHHS: Bills will better reflect real-time consumption. Forecasting and budgeting will need to adjust accordingly.

8. Ask the right questions now

Don’t wait for the deadline to find out where you stand. Start the conversation now with your supplier, your broker, or your account manager.

Questions to ask:

• Is our meter MHHS-compliant?
• When are we scheduled to transition?
• Can we see our half-hourly data now?
• Will our contract still work?
• What do we need to change?

Why it matters for MHHS: The earlier you understand what’s coming, the more control you’ll have over your setup, contracts and costs.

Getting ahead means staying in control

Delaying action means you risk:

• Being rushed into a meter upgrade
• Sticking with outdated contracts
• Missing out on flexible tariffs
• Getting caught off guard by new billing patterns

Taking simple steps now, like reviewing your meter, checking your data, and asking the right questions, puts your business in a stronger position when the changes roll out.

Need a hand?

Troo can support you at every stage of your MHHS transition, from checking your meter setup and contracts to helping you understand your half-hourly data.

Ask us to check if your business is MHHS-ready