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Market-Wide Half-Hourly Settlement (MHHS): A Smarter, More Flexible Energy Future

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Published: 11/03/2025


The UK energy market is undergoing a major transformation with the implementation of Market-Wide Half-Hourly Settlement (MHHS). This reform plays a key role in moving towards a smarter, more flexible energy system, ensuring that energy usage and generation are accurately measured and settled every 30 minutes. According to Ofgem, MHHS is expected to bring net benefits of between £1.6bn and £4.5bn for consumers in Great Britain from 2021 to 2045.

What is Market-Wide Half-Hourly Settlement?

MHHS is designed to improve the accuracy and efficiency of energy settlements by reflecting real-time consumption and generation patterns. Currently, many energy customers—especially those with older non-half-hourly meters—are settled based on estimated profiles. The shift to MHHS enables a more precise approach, supporting a more dynamic energy market.

Key Benefits of MHHS

Greater Billing Accuracy
One of the biggest advantages of MHHS is improved billing accuracy. With real-time energy data, consumers will no longer have to rely on estimated readings, reducing the chances of unexpected charges or bill adjustments.

Encouraging Energy Flexibility
By settling energy usage in half-hourly intervals, MHHS incentivises businesses and consumers to adjust their consumption in response to price signals. This means using energy when it is cheaper and cleaner, leading to potential cost savings.

Better Integration of Renewable Energy
Renewable energy sources like solar and wind are inherently variable, but a more granular energy market can accommodate these fluctuations more effectively. MHHS makes it easier to match demand with supply in real-time, reducing reliance on fossil fuels and promoting a greener energy system.

What Does This Mean for You?

If you have a non-half-hourly meter that is eligible for an exchange, your energy supplier will reach out to arrange a smart meter installation. This upgrade will be free of charge, as metering costs are covered by the supplier for non-half-hourly contracts. With a smart meter, you’ll benefit from:

  • More accurate billing based on actual energy usage.
  • Greater visibility and control over your consumption with real-time data.
  • The opportunity to take advantage of time-of-use tariffs, potentially lowering your energy costs.

How to Prepare for MHHS

To make the most of this transition:

  • Check with your energy supplier to see if your meter is eligible for an upgrade.
  • Consider adjusting your energy usage habits to take advantage of cheaper rates during off-peak periods.
  • Stay informed about market updates and new tariff options that may benefit your business.

Final Thoughts

MHHS is a crucial step towards a smarter energy system, enabling more efficient use of resources, reducing waste, and cutting costs for consumers. By embracing these changes and upgrading to a smart meter, you can unlock the benefits of more accurate billing, enhanced energy management, and a greener future.

For more insights into the latest energy market developments and how they affect your business, stay connected with Flame Energy.

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