TWO RIVERS URBAN PARK
Project Management Team
10 November 2016Engineering Services: Electrical
Key assumptions, City information and Preliminary findings
In partnership with the City of Cape Town
Melanie Attwell
and Associates
Lucien Le Grange
Architects and Urban
Planners
Electrical Bulk Infrastructure–NRS034-1:2007
TWO RIVERS URBAN PARK
Estimated Bulk Electricity Requirements and Associated Maximum SSEG Penetration
NMA Schedule 26 May 2016 - Includes River Club and Existing Development 2.2 mil m²
10 November 2016
Development Type Additional
Floor Area
Units NRS 034-1:2007
Maximum Demand
After Diversity (MVA)(m2)
Residential - High-rise 1 694 655 14086 56
Institutional
- Schools 32 500 11 1
- Other 226 744 18
Commercial 212 512 17
Parks
Sportsground 17 0
Public Open Space
Totals 2 161 411 92
Shortfall 88MVA
Energy Management
Energy Management
Energy conservationNo cost option
Occupany monitoring to control lighting and HVAC, behavoiral
change to energy use, maintenance (eg fixing leaks,
filters)
Energy EfficiencyIncreasing Cost Option
Energy efficient lighting systyems, BMS, process
optimisation, SWH, insulation
Energy substitution
Renewables and/or Fuel SwitchingIncreasing Cost Option
Solar PV / Wind / Hydro
Converting electric boilers to gas-fired
Regeneration / own
generationHigh Cost
Option
Biomass / Landfill /
Biodigestor gas-to-electrity
Green Priorities
Passive Solar Architecture/Energy Efficiency
Solar Water Heating [Distributed]
Photovoltaic [Distributed]
Biogas/Waste to Energy [District Level]
Passive Solar Architecture
Orientation – SANS 204
The building must be compact in Plan, with living areas and the major
glazing northern facing to permit solar thermal gain during the winter.
The building should have shading of the windows in summer.
Hot Water Requirements
Rooftop SWH
200 litre serves 3-4 people per day
2035 x 1350 = 2.75m²
13 962 units requires 5ha of roof
space
Engineering Services Model: Electrical
Development Type Units Comments
Residential
Township area (as per SANS 507 -1, ADMD of 2.64
kVA/unit
1 694 655 14 0862.66
Urban residential II (as per SANS 507 -1, ADMD of
5.31 kVA/unit 5.31
Selected Standard 3.99 56 133
Estimated Potential Savings
Solar/Gas water heating Yes 1.33 18 664 No electric elements allowed in development
Gas cooking and baking No 0.00 0 Dwelling breaker reduced to 20A
Sub-total
Residential Saving
Institutional
- Schools 27 500 11 85.00 935
- Other 226 744 0.08 18 140
Commercial 212 512 0.08 17 001
Sportsground 0
Peak Demand (kVA) 92208 18 664 73 544
Available Electrical Supply (kVA) - CoCT 2016 CoCT 0
Available Electrical Supply (kVA) - GIBB 2012
(793 619 m2 additional area) 5000
68 544
Selection section
Number of LSM 5 & 6 (as a percentage) 50%
Number of LSM 8 & 9 (as a percentage) 50%
Checksum TRUE
TWO RIVERS URBAN PARK
Electrical Demand Modelling
NMA Schedule 12 October 2016 - Includes River Club and Existing Development
27 October 2016
Electrical Demand
Additional Capex
( R ) per Unit
Additional Maintenance
( R / a / Unit )
Current Capacity available
Shortfall
Additional Floor Area
(m²)
Demand per Unit
(kVA)
Conventional Demand
(kVA)
Proposed MD
interventions (kVA)
Reduced Daily
Demand (kVA)
Dispatchability
For sustainable solar
power it must be
available
on-demand;
when it is needed;
where it is needed;
and
in the desired
amounts.
Demand vs Supply (PV)
Annual Solar Radiation Cape Town
Sustainability – NRS097-2-3:2014
Eskom SSEG Grid Code
1. Where the RE SSEG is to be connected to a shared point
of supply, such as a distribution transformer, the PV plant
shall not exceed 25% of the Notified Maximum Demand;
2. Alternatively, if the point of supply is a bulk dedicated
supply, for example the distribution transformer capacity is
solely applied to the consumer, the PV plant shall not
exceed 75% of the NMD; and
3. At no time shall the RE SSEG exceed 15% of the Medium
Voltage feeder capacity.
TOR requirement - No additional Bulk Electrical Services
TWO RIVERS URBAN PARK
Estimated Bulk Electricity Requirements and Associated Maximum SSEG Penetration
NMA Schedule 26 May 2016 - Includes River Club and Existing Development – 2.2mil m²
10 November 2016
Development Type Additional
Floor Area
Units NRS 034-1:2007
Maximum Demand
After Diversity (MVA)(m2)
Residential - High-rise 1 694 655 14086 56 14
Institutional
- Schools 32 500 11 1
- Other 226 744 18 13
Commercial 212 512 17 13
Parks
Sportsground 17 0
Public Open Space
Totals 2 161 411 92 14
Electrical Bulk Infrastructure–NRS034-1:2007
Categorise and Allocate SSEG
Budgetary Costs – Photovoltaic
Approximately 1.1ha is required for 1MWp of PV. Area
needs to be relatively flat or if roof space at normal
pitches. The area must face solar north and the northern,
eastern and western aspects must be clear of any
shadows;
The yield will be of the order of 1700kWh/kWp installed
per annum;
For planning purposes we can work on R20M/MWp
installed without storage; and
The installation can be distributed rooftop mounted or
consolidated in a ground mounted arrangement.
Budgetary Costs – MSW to Energy
233 347 tons of MSW with energy content of 9.2MJ/kg
will produce 17MWp;
The yield will depend on the MSW stream but roughly
speaking 100 ton of MSW per hour will provide 7kWh;
For planning purposes work on R50M/MWp [this
excludes the MSW collection, handling and storage
costs]; and
The installation would of necessity be a single
consolidated installation, provided there is a MSW
source.
Budgetary Costs-Municipal Effluent to Energy
50Ml/day yields 5000m³ of biogas which will generate
600kWp;
The yield for biogas is 6.4kWh/m³;
For planning purposes work on R50M/MWp [this
excludes the wastewater treatment plant costs]; and
The installation would of necessity be a single
consolidated installation, provided there is ME source.
Tariffs
Current Tariff
CoCT
Extended payback period
Net Metering
Drakenstein municipality
Shorter payback period
Is CoCT willing to change the Tariff Structure?