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

Power vs Energy

MVA kWh (unit)

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.

Energy Efficiency

Roof Assembly - Regulation XA or SANS 204

Energy Efficiency

Fenestration - Regulation XA or SANS 204

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?

Questions

Thank You