News / UK power prices finally drop

UK power prices finally drop

7th September 2018

Stay updated on energy market changes over the last 7 days with Haven Power’s market report.

  • UK seasonal power prices finally dropped on 30th August
  • Downwards movement on fuels complex weighed on power prices
  • Regulatory reform in the carbon market put further pressure on contracts
  • Strong start to the week for renewables didn’t persist; average generation remained low

Here’s a summary of the week starting 27th August:

Prompt/Day-ahead Power

Day-ahead prices saw mixed movement throughout week 35, with volatile wind generation and bullish gas the main driver of prices throughout. Strong peak solar generation offered little pressure to temper prices.

The week’s highest price of £68.22/MWh was for baseload power on 30th August, where gas generation was brought online to fill the gap created by low levels of wind. The relatively high cost of coal and carbon kept these options out of the mix.

The week’s low price of £55.02/MWh was for baseload delivery on 27th August when wind generation reached almost 10GW of output. Due to this high level of wind, the UK required less expensive fossil fuel generation – and coal output fell to zero over the course of the day.

day ahead 040918

Imbalance Prices

The average of all single imbalance prices during week 35 was £57.12/MWh; 10% lower than the previous week. This can be explained by higher than average wind generation (compared to earlier weeks) tempering stronger gas prices.

The week’s lowest price of -£45/MWh was for settlement period 10 (04:30-05:00) on 27th August, with strong overnight wind generation generating nearly 45% of supply.

The highest price for the week was £112.94/MWh for settlement period 36 (17:30-18:00) on 27th August. At this time, falling wind and solar generation combined with a demand spike, leading to a call for more expensive gas generation units to come online.

Imbalance prices 040918

Renewables and other

Solar and wind output contributed to 18% of the UK generation mix over week 35. Renewable output was highest on 27th August, when the combination contributed over 40% through the day, although both decreased from the mid-afternoon.

Wind generation for 27th August was roughly 10GW throughout the day. However, it averaged around 2GW for the rest of the week, forcing more gas generation into the UK fuel mix. The high price of gas drove prompt contract prices higher.

Renewables and other 040918

Seasonal Contracts

Secure and promote* (Seasons +1, +2, +3, +4) baseload contracts continued their bullish trend through the week. However, they saw a bearish turn on Thursday, 30th August, leading to an average decrease of £0.23/MWh.

Gas and carbon prices led the curve for the week, with Norwegian outages and minimal liquefied natural gas (LNG) imports pushing contracts upwards. Notifications of incoming LNG imports and weaker continental demand on Thursday led to a drop in gas prices, subsequently followed by all other contracts.

Carbon remained strong, with fossil fuels remaining a key part of the generation mix. Support for this strength followed announcements of regulatory reform heading into 2019 to limit oversupply.

Seasonal contracts 040918

*For more information about Secure and Promote, please consult this Ofgem web page.

Annual Power

The annual power graph shows how the value of an annual power contract changes over time. The annual contract value is the average of the front two seasons, currently Winter 18 and Summer 19.

Annual power 040918

To help you make sense of the industry, you can also use our jargon buster and handy guide to Third Party Costs (currently 60% of your bill). And for interesting articles and useful insights, look out for our blog.

Report written by Thomas Stebbings and Andrew Jarman, Haven Power’s Portfolio Analysts. To speak to them, or the rest of our Flex & Portfolio Management team’s analysts, on 01473 707755 quoting reference HP250.


Although we’ve made all reasonable effort to verify the information in this report and provide the highest possible accuracy, Haven Power Limited gives no warranty – express or implied – in respect of this information. Furthermore, our provision of this report does not constitute advice of any kind and readers should not take it as the basis for any commercial or financial decisions. You should make any such decision based on your own records, knowledge and perception of power market data, supplemented with appropriate independent expert advice when required.