Battery Energy Storage

By working with your assets in an innovative way you can make new gains with a battery Energy Storage System. Generators of electricity can store surplus energy from their renewable assets in a battery bank. The stored energy can then be used when grid supplied energy is at its most expensive or when there is onsite demand and no, or little, renewable generation (e.g. evening time/ winter months for PV or non-windy periods for wind turbines). The system can be further optimised by charging off the grid during cheaper tariff periods (e.g economy 7).  For Industrial users with high energy demands and  larger grid connections there are a number of other ways in which an energy storage system can benefit the business detailed below.

Dulas installed its first battery storage project over 25 years ago so we’d be unjust in calling this new technology.  With practical experience over the decades in the combining of battery storage across hydro, wind and solar PV we’ve applied our technical knowledge in getting the solution precisely right for each and every client.

Effective control of any battery storage system is the key to getting the best returns and is usually specific for any individual client. Dulas’ highly skilled staff hold the technical knowledge to work with you to understand your specific needs and size and deliver not only the most appropriate renewable and energy storage solution but an intelligent control system to maximise the returns for the investment on any given site.

The main considerations in specifying a battery storage system include:

  • Your energy demand and cost profile
  • The capacity of your electrical connection
  • The capacity of the renewables system to be integrated
  • What you want to achieve with your system
  • Location of technology (space requirements, inverter size, distance to meter)
Battery Bank on Solar PV Energy Storage site
Control Panel on combined Solar PV and Hydro Energy Battery Storage site
Independent generators and large consumers of power are already installing commercial-scale battery storage solutions, allowing them to store both intermittent onsite renewable energy as well as charging from the grid, to sell when it is most profitable. Storage projects can also earn money by providing a range of other National Grid services, such as Enhanced Frequency Response (EFR) or Firm Frequency Response (FFR).
To identify what makes a really suitable opportunity you need to understand three core pieces of information:
  • Load profiles (production and consumption) of your site, ideally down to minutes or seconds for a 12 month period
  • The electricity contract
  • Battery types, characteristics, price and performance

The commercial benefits for having storage on-site are vast a varied and include;

Demand-Side Response (DSR)

Energy storage can be used to lower peak consumption, directly affecting demand charges such as DuOS (Red, Amber, Green) and TnUOS (Triads).

Grid Scale Renewable Power

Energy Storage can smooth out renewable generation helping reduce peak generations loads. This can directly affect sites that have a potentially high yield, but weak grid access. Or, it can lower the size of export requirement by smoothing out the peak generation periods and spreading them over 24hrs. This can reduce the cost of grid connection in some locations by a couple of pence to the pound.

Frequency response

The National Grid  must maintain a continuous balance between generation across the UK  and consumption. Due to this the grid pays varying amounts of money to those than can both reduce consumption, or feed generation into the grid within a short period of time. The amount of power and the speed of response that any one business can provide to the grid, either through reducing demand or through generating extra energy, is directly linked to the amount of potential revenue that it can claim.

Storage can help businesses be active in this lucrative market; allowing the site to reduce their demand from the grid, by pushing energy back into the grid and can also potentially prove backup for critical services on the site under some circumstances.  Battery storage is able to respond much more rapidly than some more common forms of accessing this market through STOR (Short Term Operating Reserve), for example diesel generators. This “Speed of Response” can provide access to an enhanced revenue model.

Payback & Financing

Storage helps your business be more energy resilient. It provides potential extra revenue and if linked to on-site generation, it demonstrably helps your business operate “greener”. Payback however can often be the first barrier as IRRs and ROI can be longer than most companies would feel comfortable with.

Luckily the technology is now gaining more interest from the financial sector and many investors provide off-balance sheet financing, meaning that you can immediately benefit from having storage on-site without having the impact to your balance sheet.

Dulas have been working with this technology at all scales since its infancy so we’re well placed to support you with your project. Be assured of our expertise backed up by high accolades in Health and Safety standard and put your project in safe hands.