Monday, 10 April 2023

Gresham House Energy Storage Trust - Full Yr Results

Since its launch in December 2018, Gresham House Energy Storage (GRID) has developed the largest energy storage portfolio in the country. It operates 20 utility-scale energy storage sytems with a total combined capacity of over 500MW.

As we transition from fossil fuel generation to renewables such as wind and solar, we will increasingly need energy storage solutions due to the intermittent nature of renewable energy - the wind doesn't always blow and there's not much solar in the winter months.

Currently we use gas-fired generation to fill the gap but we have legislated for net zero carbon emissions by 2050 so the ability to store excess energy from an ever increasing capacity from renewables will be essential. As renewable capacity expands, gas-fired power stations will be required less frequently and so they become less profitable to run. This means that renewables are forcing fossil fuels off the grid.

As recently as 2014, coal was our main source of electricity generation. It is still used in the winter months but currently accounts for just 2% of  generation and is due to be completely retired by the end of next year.

GRID has several streams of revenue which include the wholesale market and National Grid balancing mechanism, Firm Frequency Response based on small-scale changes to the grid's electrical frequency, fixed fees for being on call to deliver power at times of extreme need and Triad payments from National Grid when there is peak demand.


The company have recently released results for the full year to end December 2022 (link via Investegate).

Net Assets have increased by 39% per share over the year on a total return basis to 155.5p (last year 116.8p) and share price return is up 29.6% compared to FTSE 100 Index of 4.6%. The share price premium has reduced from around 15% to currently 5%. This was by far my best performing investment over the past year.

Operational revenues increased by 22% to £62m compared to £51m for the previous year. The company is forecasting growth of at least 15% in the coming year.

Over the year, the company has acquired three more storage projects with a total capacity of 141MW. Operational capacity increased by 29% from 425MW to 550MW by the end of the year. Capacity is expected to reach 1GW by the end of 2023 and 1.5GW in 2024. Looking forward, the management are looking to expand overseas and will seek authorisation to invest up to 30% of assets internationally.Looking to the second half of the decade they aim to expand into Europe, US and Australia and have set an ambitious target of 5GW by 2030.

The total UK energy storage capacity has increased to 2.4GW and is expected to grow ten-fold over the coming 3 to 4 years. GRID continue to be the market leader with around a 30% share.

Commenting on the results, Chair John Leggate CBE said 

"In 2022 GRID further built on its strong track record and delivered significant growth in earnings, operational capacity and NAV per share, while maintaining a fully covered dividend as projects became operational. Following GRID's strong trajectory in 2022, the Company has set its ambitions higher going into 2023.

We expect the EBITDA of the underlying investment portfolio to increase in 2023 as more projects are commissioned and operational capacity increases. This should also lead to growth in both NAV per share and earnings per share. As such, we expect to increase our 2023 dividend by 5%.

We are exceptionally well-positioned to capitalise on the exciting battery energy storage opportunities ahead of us in the UK and our targeted international markets.

We expect to see the income generating capacity of the underlying investment portfolio grow as the Fund's operational MW capacity almost triples through 2025, and as MWh capacity grows even faster as we increase the average duration of our portfolio (new projects are increasingly built out to 2-hour duration). Beyond this, it is clear to the Board and the Manager that we are still only in the foothills of the opportunities in the energy storage arena in Great Britain and globally and significant growth beyond 2025 is expected to drive ongoing shareholder returns for many years."

The company has paid a total dividend of 7.0p over the past year as promised and has increased this target by 5% to 7.35p for 2023. This gives a forward yield of 4.6%.

GRID 3 Yr Share Price/NAV

I added this trust to my green portfolio in December 2019 at the price of 105p...its currently 159p and continues to trade at a premium to net assets. The shares currently account for around 6% of my green portfolio with a further 6% invested in Gore St Energy Storage.

The focus so far has been batteries but they are now looking at the potential from solar PV and I am wondering whether they have considered other energy storage solutions such as longer duration flow batteries or green hydrogen as these also have lots of potential.

“Our world needs climate action on all fronts - everything, everywhere all at once” said Antonio Guterres at the launch of the latest IPCC report last month. It emphasised the urgency in addressing the climate emergency and called for investment in clean technologies at scale. (In-depth guide to report from Carbon Brief)

The reality is that fossil fuel generation will gradually be replaced by renewables as we move towards our net zero target by 2050. This means increasing intermittency which will require ways to store energy to bridge the gaps and provide a constant supply.

So, the market looks bright for this sector of the transition to cleaner energy. I may well look to increase my holding in the coming year in the event of further share offering/placing.

As ever, this article is merely a record of my personal investment decisions and should not be regarded as an endorsement or recommendation - always DYOR!


  1. During the results presentation the investment manager almost laughed at the idea of using hydrogen for storage when asked. Hydrogen’s applications seem to be more transport based.

    1. The manager would be foolish to dismiss the potential of hydrogen storage imho.

      For example, the EU will be increasingly using renewable hydrogen to decarbonise many sectors of their economy as part of its REPowerEU plans.

      Batteries provide short term back-up - typically just one or two hours but hydrogen will provide back up for longer periods - days, weeks - and provide more flexibility to energy systems.

      Here's a link to their hydrogen policy...

    2. There's work ongoing where H2 is stored in underground gas storage caverns - each the size of several St. PAUL'S cathedrals.

      The idea of having a gasometer with low pressure H2 storage is a non starter for many reasons.

      Keeping it liquid has other obvious problems