Early project decisions can have a disproportionate impact on the technical and economic performance of an energy solution. Grid capacity, site conditions, demand profiles, infrastructure interfaces and future energy requirements can significantly influence which concepts are viable. Once these parameters are fixed, the scope for optimisation becomes considerably smaller.
A feasibility study creates the basis for informed decisions before a project enters detailed planning. By assessing technical options, economic performance and implementation requirements together, it helps identify viable solutions, compare alternatives and address critical constraints at the stage when they can still be managed efficiently.
Whether the project involves photovoltaics, battery energy storage, heating and cooling, charging infrastructure or a combination of technologies, five issues are particularly important to address early.
1. Selecting a technology before defining the requirements
A project should start with the energy requirements and objectives – not with a predetermined technology.
A battery energy storage system (BESS), photovoltaic system, heat pump or other technology may initially appear to be the obvious solution. But the appropriate energy concept depends on factors such as current and future demand, load profiles, operating patterns, available energy resources, electricity tariffs, security-of-supply requirements and the development plans for the site.
The first step is therefore to establish what the energy system needs to achieve. A feasibility study translates these requirements into technical parameters and allows suitable technologies and system configurations to be compared before a solution is selected.
2. Identifying grid, site and infrastructure constraints too late
A technically sound energy concept must also be feasible at the specific site.
For electricity projects, available grid connection capacity and the requirements of the distribution system operator can materially influence system design and project economics. For thermal and integrated energy systems, existing infrastructure, temperature levels, energy sources and distribution networks may be equally decisive.
Physical conditions also matter. Available space, structural requirements, access, plant rooms, safety distances, fire protection, noise restrictions and permitting requirements can all affect the solution.
Identifying these constraints at an advanced stage can lead to additional engineering, delays and avoidable investment. An early feasibility assessment allows relevant requirements and interfaces to be incorporated while there is still sufficient flexibility to optimise the project.
3. Building the business case on assumptions that have not been tested
Technical feasibility does not automatically mean economic viability.
A credible assessment needs to consider CAPEX and OPEX, energy prices, grid tariffs, operating costs, equipment lifetime, efficiency, maintenance, financing assumptions and – where applicable – potential market revenues.
This is particularly important for technologies such as battery storage, where several potential use cases may exist. Peak shaving, self-consumption optimisation and market participation, for example, cannot necessarily deliver their theoretical maximum value simultaneously.
A feasibility study tests the business case under realistic operating assumptions and different scenarios. Sensitivity analyses can identify which variables have the greatest influence on profitability and where the principal economic risks lie.
The purpose is not to demonstrate that a preferred solution works financially, but to establish whether the investment case is sufficiently robust to proceed.
4. Assessing individual technologies instead of the complete energy system
Energy technologies increasingly interact with one another.
Photovoltaic generation affects electricity procurement and potentially the economics of battery storage. Electrification of heating and mobility changes future electricity demand and peak loads. Storage can influence self-consumption, grid utilisation and procurement strategies. Waste heat or locally available renewable energy sources may create opportunities that are overlooked when individual technologies are assessed separately.
For this reason, the technically optimal component is not necessarily part of the economically optimal overall solution.
A feasibility study should therefore consider generation, consumption, storage, distribution and procurement as an integrated energy system. This makes it possible to compare different configurations, understand dependencies and identify synergies before individual investment decisions are fixed.
5. Addressing energy requirements too late in project development
The timing of energy planning can have a substantial impact on the range and quality of available solutions.
As a building, industrial site or infrastructure project progresses, important parameters become increasingly fixed. These may include available areas, grid connection capacity, electrical infrastructure, plant rooms, access, construction phases and investment budgets.
Once these parameters have been defined, technically attractive energy solutions may become more difficult or more expensive to implement. Opportunities to integrate technologies, optimise infrastructure or coordinate investments can also be lost.
Considering energy requirements at an earlier stage preserves flexibility and allows interfaces with other planning disciplines to be identified before they become constraints. It also enables technical and economic alternatives to be evaluated while meaningful changes to the project are still possible.
This does not require detailed engineering at the beginning of every project. It requires the appropriate level of analysis at the appropriate stage.
What should an energy feasibility study include?
The scope of an energy feasibility study depends on the project, the site and the decisions that need to be made. Typically, it may include:
- current and projected energy demand and load profiles;
- existing energy infrastructure and site conditions;
- renewable generation and energy-efficiency potential;
- relevant technologies such as PV, battery energy storage systems (BESS), thermal systems and charging infrastructure;
- grid connection and infrastructure requirements;
- comparison of alternative system configurations and preliminary sizing;
- CAPEX, OPEX, potential savings and revenue streams;
- economic scenarios and sensitivity analyses;
- technical, regulatory and implementation risks; and
- recommended next steps and an implementation roadmap.
The objective is not to carry out detailed engineering prematurely. It is to establish which options merit further development and to provide a reliable basis for subsequent planning and investment decisions.
From feasibility to an informed investment decision
A feasibility study should not predetermine the outcome.
It may confirm the initial project concept. It may identify a technically or economically stronger alternative. It may show that a different system size or combination of technologies is preferable. Or it may demonstrate that an investment should not be pursued under the current conditions.
Each of these outcomes provides valuable information when it is established before substantial capital and engineering resources have been committed.
By addressing technical feasibility, economics, infrastructure requirements and implementation risks together, a feasibility study reduces uncertainty at a critical stage of project development. It provides a robust basis for deciding what to develop further, how to structure the next phase and where investment can create the greatest value.
