Bid Stacks
We’re all familiar with analysing bid stacks – how much volume offered at what price, across 10 buckets for each unit, aggregating by portfolio and region. But what if we apply constraints to our well known bid stack. We may finally answer the common question: “how many megawatts before it spiked in <insert region> last night”…. and know the unit that might have set the price (possible marginal unit).
Our constrained bid stack visualiser
Our bid stack is the first in an attempt to enable market equilibrium analysis on the electricity bid stack in dispatch. This is a constrained bid stack, but not ‘marginal’, in a sense that all constraints are applied up until the point of market clearing. Although, not perfectly accurate, it brings us closer to estimating the regional capacity response (for a change in demand) ie. spike levels, the regional demand beyond which electricity spikes occur.
This differs from traditional bid stack analysis because the following constraints are applied:
– Frequency Control Ancillary Services (FCAS) trapezium for generators and loads.
– Network Support and Control Ancillary Services (NSCAS) services.
– Unconstrained intermittent generation forecasts (UIGF)
– Semi-scheduled dispatch caps.
– Interconnector losses according to the NEMDE loss model.
– Generator and load ramp rates.
– Fast start inflexibility profiles (FSIP).
– Interconnector headroom (coming soon).
– Transmission and FCAS constraints (coming soon).
Contact me for more info or a demo.