The recent change in government has brought about a significant change in the direction of energy policy, one which is far more supportive of renewable energy generation than the previous administration. Building on a key pillar of its manifesto, the new Labour government has wasted no time in changing policy, consenting large schemes and generally talking up the sector.

One of the most significant changes has been July’s policy statement on onshore wind, along with the government’s draft revisions to the National Planning Policy Framework (NPPF), a consultation on which has recently concluded. Removing the footnote in the NPPF which had put onshore wind on an uneven footing compared with other renewable technologies has removed a significant barrier to turbine installation.

The government has also committed to a target of doubling onshore wind capacity, from 15 GW to 30 GW by 2030. Most of this capacity is likely to come from Scottish projects and repowering projects in England by upgrading existing sites. However, this policy change also presents an opportunity for commercial building and estate sites with high energy use, enabling them to generate energy locally, making long-term energy cost savings and supporting energy security.

How to design an onsite wind turbine
Sites can install a turbine onsite or nearby which connects directly into the building to provide energy. These turbines often range from 200 kW to 4 MW. Sizing will be driven by energy demand, planning considerations and grid capacity, depending on how much energy is likely to be exported. The renewable energy will offset consumption from the grid which can often equate to 20–25 p/kWh in the current market. Any energy that is not used can be exported to the grid for a lower price of 7–9 p/kWh through an export power purchase agreement (PPA).

Site owners should note that sites which have previously been discounted may now be viable as a result of the advances in technology and increased means of mitigating issues relating to radar and aviation.

High-energy users have often already installed some solar photovoltaics (PV) at their sites, but energy output naturally peaks during the summer months. Wind turbines, on the other hand, generate electricity all year round, but mostly during the winter months. As a result, a turbine can complement an existing solar installation on such sites.

Battery storage can also complement wind turbines, storing excess energy generated onsite to be used later. While battery storage costs have, and continue, to come down, they are still high. As a result, it is important to consider whether a battery is really required on a project-by-project basis.

The main drivers for using batteries on site are where maximising onsite usage of renewable energy is key, potentially due to energy security or other environmental, social and governance (ESG) targets, and where there are restrictions on available grid capacity, which results in minimal or no export being available.

High-energy users have often already installed some solar PV at their sites, but energy output naturally peaks during the summer months. Wind turbines, on the other hand, generate electricity all year round, but mostly during the winter months.

How to develop a business case
As with all renewable energy generation, the resources available vary by location, and one of the first stages with any wind project is to understand the local wind speeds. Once these are known, then it is possible to understand the business case in more detail. For example, a 1 MW turbine can generate 2,500–3,000 MWh annually (depending on wind speed). Typical costs of £1.2–1.4mn/MW will vary as a result of the logistics of delivery, any planning mitigations and ground conditions.

The payback period is highly dependent on energy consumption, but the more that is used onsite, the quicker the payback. An export PPA can be arranged for any electricity which is exported, but the turbine should ideally be sized to minimise export.

While the recent policy change means that onshore wind is again on a level footing with other types of renewable energy generation, turbines still need to pass through the full planning application process. However, there is no longer the potential for a single objection to derail a wind project. Instead, local authorities need to take local opinion into account while assessing the overall value of development. They must also be supported by the necessary surveys, studies and planning case materials.

A wide range of constraints can impact a turbine development and these must be assessed at the outset. One example is nearby residential developments and appropriate clearance distances from paths and roads. One of the benefits of installing wind schemes near a building with high energy use, and connecting directly into the building, is that it presents a clear rationale for the turbine to be at that location, which can greatly help with supporting the argument to make to the planning authority.

With a much more positive approach to onshore wind being taken by central government, we see huge potential for companies to take advantage of the opportunity to install a wind turbine at their sites. This will allow buildings to generate their own renewable energy with the potential for considerable savings on energy costs to drive a quick payback on this investment.

The views and opinions expressed in this article are strictly those of the author only and are not necessarily given or endorsed by or on behalf of the Energy Institute.

• Further reading: ‘How local energy benefits local people’. Local energy projects deliver enormous benefits compared to commercial projects, according to Angela Terry, CEO, One Home, who led development of the first 100% community-owned wind farm in Oxfordshire, UK.
• Find out how the new state-backed GB Energy partnership with The Crown Estate aims to ‘turbocharge’ the UK’s energy independence.