Ofgem orders independent review of heatwave grid operations

Ofgem orders independent review of heatwave grid operations

The energy regulator has ordered an independent review of how National Grid managed the electricity system during the July 2026 heatwave, as Reuters reports. The announcement comes after temperatures topped 38°C in parts of southern England, pushing electricity demand to near-record levels as millions of households switched on air conditioning units and fans.

The review will be led by an independent panel, according to marketscreener.com, and is expected to report within six months. The regulator has faced criticism for being slow to act after several grid alerts were issued during the heatwave, with some areas warned of potential rolling blackouts. TradingView notes that the review will examine whether National Grid had sufficient reserve capacity and whether its communication with the public was adequate.

What the review will cover

The independent review will focus on three areas: the accuracy of demand forecasts, the adequacy of reserve power margins, and the effectiveness of emergency protocols. Ofgem has said it wants to understand whether the grid operator’s actions during the heatwave “met the standards expected” and whether any lessons can be applied to future heat events, which are expected to become more frequent.

But the review will also look at the role of consumer behaviour. Millions of households turned to portable air conditioning units and fans, many of which are inefficient and draw significant power. The review may recommend better demand-side response mechanisms, essentially, paying households to reduce consumption during peak times. That could mean more households signing up to schemes like the Demand Flexibility Service, which paid some households up to £100 last winter for shifting usage away from peak hours.

What it costs a typical 3-bed semi

For a typical 3-bed semi using 12,000 kWh of electricity per year, the heatwave added roughly £15–£25 to the July bill, based on the extra cooling load. But the bigger concern is network charges. These make up about 20% of a typical bill, roughly £140 a year. If the review leads to higher network reinforcement costs, that figure could rise by 5–10% over the next two years, adding £7–£14 to the annual bill.

There is also the question of EPC ratings. Currently, an EPC assessment does not account for cooling efficiency or heat resilience. But if the review recommends changes, future EPCs might include measures like solar shading, insulation upgrades that reduce heat gain, or even the presence of battery storage. That could affect a home’s EPC band and, by extension, its value and eligibility for certain mortgages.

Grants and schemes you can use now

No new grants have been announced as a direct result of this review. But existing schemes can help homeowners prepare for future heatwaves. The Boiler Upgrade Scheme offers £7,500 towards a heat pump, which can also provide cooling in some configurations. The ECO4 scheme provides free insulation for low-income households, which reduces heat gain in summer as well as heat loss in winter. The Home Upgrade Grant (HUG2) also covers insulation and solar PV for off-gas-grid homes.

Battery storage is not yet covered by any major grant scheme, though some local authorities offer interest-free loans. The review may prompt the government to extend the Smart Export Guarantee to cover battery discharge, or to include storage in future ECO schemes. For now, a typical 5 kWh home battery costs £4,000–£6,000 installed, and can save about £200–£300 a year on electricity bills if paired with solar panels.

What homeowners should do now

The review will not report for six months, and any policy changes will take longer. But there are steps you can take now. First, check if your home is eligible for the Demand Flexibility Service, sign up through your energy supplier. Second, consider basic heat resilience measures: loft insulation, reflective window film, and external blinds can reduce indoor temperatures by 3–5°C without using electricity. Third, if you are planning a solar PV installation, include battery storage from the start, it is cheaper than retrofitting later.

Finally, keep an eye on the review’s recommendations. If the government follows Ofgem’s likely advice, we could see new incentives for home batteries, changes to EPC methodology, and higher network charges for those who do not have demand-side response capability. The smart money is on getting ahead of the curve, installing the tech now, while grants are still available and before any new charges kick in.