Insights / We cut energy output in our Ipswich office by 29%

We cut energy output in our Ipswich office by 29%

12th October 2020

Organisations that reduce their consumption can become both more sustainable and more successful – and play their part in reducing the planet’s carbon emissions.

We also know that seeing is believing and that sustainability begins at home. So, what better way to show the benefits of sustainable action – such as carbon cutting and cost savings – than by ‘walking the talk’ at one of our own offices?

Our objective

In 2019, we wanted to improve energy efficiency at our Ipswich office by at least 25%.

As well as achieving a huge reduction in consumption, we wanted to make sure the energy we used was cleaner. That meant incurring fewer carbon emissions throughout our operations.

Of course, such a goal had to make business sense, be cost efficient and show a good return on investment too.

Haven Power office aerial view

The plan

The Drax Electric Assets (EA) team – specialists in helping customers optimise their power-intensive machinery and other assets – took on the challenge at our own offices in Ipswich. Members of the team applied the same skills and processes that they know work on a customer’s site. By analysing business operations, they aimed to find smart ways to save energy, clean-up usage, and discover if those changes also created opportunities for making money.

The EA experts worked alongside the Drax Renewables team that investigate options for on-site generation and help businesses become self-reliant energy producers. This can also create new revenue streams, as well as producing zero carbon power.

The plan for our Ipswich office revolved around four core initiatives:

  1. On-site renewable generation that would reduce reliance on imported electricity
  2. Switching to, and encouraging use of, Electric Vehicles (EV)
  3. Updating to energy efficient technology that would reduce consumption
  4. Investing in battery storage that would take advantage of demand-based cost savings

Read on to discover how the team put each initiative into action.

Talking about our generation

Installing renewables generation onsite

We installed photovoltaic (PV – i.e. solar) generation technology on the building’s south-facing roof, to power it – and reduce demand on the Grid – when consumption costs are highest. Thanks to our awareness of the energy industry, we were able to commission the installation work in time to be eligible for the Feed-in-Tariff (FiT) scheme. Although this scheme is now closed to new generators, the team can still help customers find the onsite generation solution(s) that best suit(s) their needs.

Haven solar panels

Installing a battery storage facility

As the Ipswich office is rented, the team decided to install a semi-permanent 80kWh battery storage unit outside, housed within a transportable container. The facility can store the total amount that the solar panels can generate during peak periods.

The office uses electricity from the solar array and, in sunny periods when generation levels are higher than consumption, the battery stores the excess power. The office can then draw upon this at other times, including when Grid costs are high, or export the saved energy back to the Grid to earn additional income.

In the know, with the DNO

When planning the installation, the team worked closely with the local Distribution Network Operator (DNO). Initially, the DNO advised that an overload on one of the phases at the nearest sub-station made it impossible for the office to export its excess generated energy. To get around the issue, the team worked with the equipment suppliers to redesign and install an export limitation device on the battery and solar array.

The DNO approved the re-design and the team continued to liaise with the operator over the following months as the project continued. Thanks to this close working relationship with the DNO, the team learned about a sub-station upgrade that meant we could rework the installation design and remove the export limitation device. This allowed the team to achieve the project’s goals and successfully deliver the office’s excess generation back to the Grid.

Flip the switch

Using the onsite solar and battery to cut costs

Generating and storing your own energy has obvious cost-saving implications. Even so, our team likes to go one step further – as it does with our customers – and analyse the energy usage patterns to find more ways to lower costs. At Ipswich, the solar array and battery storage arrangement gave the office unprecedented control over energy usage, allowing the team to get tactical with our power management.

The newly installed battery was programmed to discharge stored energy to the building between 4.00pm and 7.00pm each weekday. This is when energy consumption costs are highest, since demand on the Grid reaches a peak. We also made sure that the battery had the capability to trigger and avoid the Triads. These are the three half-hour periods, between November and February, with the highest demand on Great Britain’s electricity transmission system.

Coinciding off-Grid consumption from a battery with these forecasted periods (that attract energy price fluctuations) can help any business reduce its Grid consumption and costs. Ipswich was no exception and, as a bonus, the battery also helps make sure the office can continue operating in the event of a power cut.

Battery energy storage

Lighting the way with LEDs

The team’s review of power usage identified that lighting was one of the Ipswich office’s highest costs – something that’s true for most businesses with an office footprint.

The team organised for the installation of low power light-emitting diodes (LEDs) to replace the building’s traditional halogen fittings. These LEDs use approximately one third of the energy per bulb for the same light output and so deliver an immediate and significant reduction in electricity consumption.

Life in the fast lane

Encouraging the uptake of EVs

Looking beyond the inside of the building, the team saw that changing the office’s pool car (that ran on traditional fuel) for a more sustainable vehicle would also be beneficial. The company agreed to upgrade the car to a new BMW i3 electric vehicle (EV) and to install four dedicated EV-only bays with charge points in the office car park.

EV in Autumn - no number plate or office - edited

As well as being used by colleagues driving the shared EV, these charge points can now be used by employees with their own EV – as well as by visitors – at no cost. By connecting these charge points to the building’s solar supply, we guarantee a truly carbon neutral charging infrastructure.

There’s a huge amount of choice for EV installation and connection partners, so the team worked hard to find the most efficient and cost-effective charging solution for our needs. To future proof the installation, the team created an infrastructure that allows for additional charge points to be connected as needed. This planning also took account of the good practice principle of only digging up the ground once, to minimise disruption to everyday business.

EV cars charging

The results

The coupling of energy efficiency savings with renewable generation has delivered clear and measurable benefits to our Ipswich office. Comparing May 2019 to the same period in the previous year, electricity import was down by an average of 29%.

Import from grid graph

Solar PV installation

  • Installed an array with 80 kWp (peak kilowatt) capacity in March 2019
  • 30% reduction (on average) in the amount of imported electricity compared to previous year
  • Increased to a 43% saving over the summer of 2019
  • During the summer, solar PV provided up to 30% of office’s consumption requirements
Consumption, import and solar graph

Battery storage

  • An 80kWh system is now in place on site, providing a total export capacity of 678kWh
  • Office now uses this as its main power source during peak times (4.00pm-7.00pm), helping to avoid the highest energy costs
  • The system is a contingency measure, so the office can keep operating without interruption in the event of a power cut

LED lighting upgrade

  • The lower power LEDs use one third of the energy per bulb for the same light output as the halogen lighting previously in place
  • Switching to LEDs has reduced daily electricity consumption by over 10%, saving 17 tonnes of CO2e (carbon dioxide emissions)

EV investment and charging points

  • In 2019, the EV pool car travelled 6,924 km and prevented 1.7 tonnes of CO2e entering the atmosphere (compared with the petrol car that would have been used)
  • Between installation and December 2019, the charge points dispensed 9 MWh of power over 550 sessions, saving 7.5 tonnes of CO2e
EV charging points graph

How can your business benefit?

We saw incredible success at our Ipswich office – and want to replicate it with businesses all over the UK.

If you want to cut consumption, costs and carbon emissions, we’ve got a team who can help.

Get your business on the fast track to net zero in no time – today.

Contact us