Residual electricity demand is the requirement that must be covered in addition to defined self-supply or allocated deliveries. System boundaries and the period assessed are decisive: an annual balance alone does not fully describe the remaining supply gap.
On-site generation, a PPA or a purchased block can cover part of demand. Check whether the volume is actually available at the same time and can be allocated to the supply point being assessed. Surpluses in one period do not automatically eliminate shortfalls in another.
AT A GLANCE
DemandConsumption per period
CoverageUsable allocated volume
RemainderAdditional supply
NeoBid’s own overview.
PROPERTY PRACTICE
What does this mean for your portfolio?
For photovoltaics on an office building, compare consumption and usable generation in matching time intervals. Weekends, winter months and possible storage management affect residual demand. A tender must clarify whether the forecast total volume or the remaining grid purchase volume is stated. Otherwise, the same generation may be deducted twice.
An example.
Our own calculation example: period A requires 100 kWh and provides 80 kWh of usable generation, leaving 20 kWh uncovered. Period B has demand of 40 kWh and generation of 60 kWh. Without storage or another contractual balancing arrangement, the 20 kWh from period A still needs additional supply.
Illustrative volumes; no statement about specific metering or balancing rules. Use of surpluses is considered separately.
WHAT MATTERS
Three questions for your portfolio.
01
Which generation or deliveries are already included?
02
Are demand and coverage comparable over time?
03
Who manages surpluses and shortfalls?
Make the distinction clear ↗
Residual electricity demand must not be equated with residual load across the entire electricity system. Here, it concerns the specifically defined supply of your property or portfolio.
Sources reviewed: 18 September 2026 · Editorial team: NeoBid
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