This folder has the workings and results from the grid use model which assesses:
(a) benefits from more efficient grid use 
(b) benefits from avoided costs of inefficient investment in batteries
(c) costs of transmission investment brought forward

Information on parameters used in the model are in the 'Parameter estimates' folder. 

The file 'Variable names.xlsx' has a list of names of variables used in the model.

The main Grid use model workings and results can be found in the 'Sensitivities' folder.

A model with fixed parameter values (for a single simulation) is in 'Grid use model/Models'. The file 'Central.py' reads data from the 'Data' folder and writes output to the 'Output' folder.
In the output folder there are files that calculate 
(1) aggregate results ('Aggregates.py'), including present valued costs of battery investment brought forward 
(2) welfare gains and costs based on 
	(i) a consumer surplus measure ('Welfare_and_costs_CS.py')
	(ii) a compensating variation measure ('Welfare_and_costs.py', a sensitivity)
(3) grid-connected generators' earnings ('Earnings.py')

SENSITIVITIES, FOR SIMULATIONS WITH A RANGE OF PARAMETER VALUES AND POLICY SCENARIOS

Model files are in the top level of the 'Sensitivities' folder.

4 core scenarios/model files contain the models with the facility to vary input parameters/data relating to generation LRMC, generation SRMC, demand growth rates and Tiwai closure date:
- Central.py
- Central_BBC_ex_OH.py, for analysing effects of recovering overheads in the residual charge
- Central_review_7525.py, for generation share of benefits under the simple method set at 25% after a review
- Central_7525.py, for generation share of benefits under the simple method set at 25% from the start of the proposed TPM

4 files for looping over combinations of parameter values and running a version of the model for each combination:
- Central_run_all.py 
- Central_BBC_ex_OH_run_all.py
- Central_review_7525_run_all.py
- Central_7525_run_all.py, 

Each run/sensitivity outputs 8 files for each simulation into the Output folder, with file names prefaced by the simulation name 's_[SRMC]_[LRMC]_[Demand]_[NZAS closure year]_[Generator share of benefits in simple method]'.

Simulation results are outputted to named sub-folders within the 'Sensitivities/Output/' folder. 

4 files are used to collect the results of all simulations for each scenario into summary files:
- Central_collect_results.py 
- Central_BBC_ex_OH_collect_results.py
- Central_review_7525_collect_results.py
- Central_7525_collect_results.py,

The files used to collect/collate results call 3 files that are slices of files used in the main model files for summarising generator earnings and welfare and costs. These are:
- Earnings.py
- Investment.py
- Transmission_costs.py

The files used to collect/collate results create 5 summary output files, for each scenario, that are outputted to the 'Summary' folder. 

4 files are used to summarise the results (output name 'summary_results.csv'):
- Central_summary_results.py
- Central_BBC_ex_OH_summary_results.py
- Central_review_7525_summary_results.py
- Central_7525_summary_results.py