The Road to Net Zero - Part 3
- Matching Energy Supply and Demand
An energy system has to balance not just how much energy
is required, but when it is required.
Annual energy totals tell only part of the story.
A site might generate as much renewable electricity over a
year as it consumes and yet still import substantial amounts of electricity
because generation and demand occur at different times.
Understanding the profile of demand and generation is
therefore fundamental.
Half-hourly or higher-resolution modelling, combined with
Time-of-Use energy costs, allows different combinations of renewable
generation, storage, flexible demand and grid capacity to be tested.
Detailed energy-flow modelling can identify:
• how much renewable generation can be consumed locally;
• when surplus generation is likely to occur;
• where storage creates value;
• when export is commercially attractive;
• where peak demand drives infrastructure costs; and
• when grid import or export constraints become critical.
This is particularly important when assessing energy storage.
Rather than simply asking "What size battery do we need?", different storage capacities and operating strategies can be modelled against the evolving energy system.
This type of analysis can also inform the investment trajectory. For example, it may be preferable to install an initial BESS sized around today's requirements while allowing for future expansion as electrical demand grows, renewable generation increases or battery costs fall.
The objective is therefore not necessarily to maximise renewable generation or storage capacity. It is to optimise the evolving energy system at the right time.
Carbon is only one part of the business case. - Affordability and commercial value are equally important.
Renewable generation can reduce purchased electricity costs or create export revenues. Flexible consumption and export can improve project economics. Batteries can manage peak consumption, potentially reduce capacity-related costs and increase renewable self-consumption.
EV charging can turn locally generated electricity into a new revenue stream. Private-wire arrangements can connect generation directly with demand.
Flexible loads can increasingly respond to variations in electricity price and system conditions.
Conversely, poorly coordinated electrification can substantially increase peak electrical demand and trigger expensive network reinforcement.
A credible strategy therefore needs to consider cost, carbon, resilience and commercial value together.
The best solution is rarely the individual technology with the lowest carbon emissions. It is the combination of measures that produces a technically robust, flexible and economically sustainable energy system.
Having established the trajectory, considered the whole system and modelled how supply and demand interact,
Part 4 addresses the critical final step: converting strategy into investable projects.