1. Economics of Energy Efficient Lighting Outdoor
Prepared by ISR – University of Coimbra
August 2017

2. Summary Economics of Lighting LifeCycle Cost (LCC) Payback
LCC/Payback calculation – Example
Online tools
Energy Efficiency Investments
6. Additional Benefits of Energy-Efficiency

3. 1. Economics of Lighting Initial cost Operating cost Maintenance cost.
For the economic evaluation of different lighting solutions the Life-Cycle Cost (LCC) or Total Cost of Ownership (TCO) should be considered.
Total lighting systems costs include:
Initial cost
Operating cost
Maintenance cost.

4. 1. Economics of Lighting
Life-Cycle Cost (LCC) / Total cost of ownership for two types of lamps
The initial investment in the LED installation may be higher than a traditional lighting installation, but the LEDs lower energy consumption and maintenance cost may provide a lower total cost over the lifetime of the installation.
The same is true for luminaires. When using an energy efficient and optically superior luminaire, higher initial costs are quickly offset by using fewer luminaires. Less luminaires translate to savings in energy consumption and maintenance over the life of the product.

5. Economics of Lighting 2. LifeCycle Cost (LCC)
Initial Cost (IC): e.g. costs for the lighting design, lighting
equipment, wiring and control devices, and the labour for the installation of the system.
Operating cost (OC): energy
Maintenance Costs (MC): e.g. replacement of the burnt out lamps (relamping), cleaning, replacement of other parts (reflectors, lenses, louvers, ballasts, etc.)
𝑳𝑪𝑪=𝑰𝑪+𝑶𝑪+𝑴𝑪

6. Economics of Lighting 2. LifeCycle Cost (LCC)
Investment / Initial Cost (IC)
Data to be collected (for each technology option):
Number of luminaires (n)
Luminaire price including the light source (CL)
Installation costs per luminaire (CI)
𝑰𝒏𝒊𝒕𝒊𝒂𝒍 𝑪𝒐𝒔𝒕 € =𝒏× 𝑪 𝑳 + 𝑪 𝑰

7. Economics of Lighting 2. LifeCycle Cost (LCC)
Operating Cost (OC)
Data to be collected (for each technology option):
Number of luminaires (n)
Power per luminaire including lamp and ballast/driver, in Watt (PL)
Electricity cost, €/kWh (CE)
Annual operating hours (h)
𝑶𝒑𝒆𝒓𝒂𝒕𝒊𝒏𝒈 𝑪𝒐𝒔𝒕 € = 𝒏×𝒉× 𝑷 𝑳 × 𝑪 𝑬 𝟏𝟎𝟎𝟎
Annual operating hours (h)

8. Economics of Lighting 2. LifeCycle Cost (LCC)
Maintenance Cost (MC)
Data to be collected (for each technology option):
Number of luminaires (n)
Lifetime of lamp, in hours (LL)
Lifetime of project, in hours (LP)
Lamp exchange costs, including lamp and manpower (Cm1)
Other maintenance costs (Cm2)
𝒊𝒇 𝑳 𝑳 < 𝑳 𝑷 , 𝑴𝒂𝒊𝒏𝒕𝒆𝒏𝒂𝒏𝒄𝒆 𝑪𝒐𝒔𝒕 € =𝒏× 𝑳 𝒑 𝑳 𝑳 × 𝑪 𝒎𝟏 + 𝑪 𝒎𝟐
𝐢𝐟 𝐋 𝐋 ≥ 𝐋 𝐏 , 𝐌𝒂𝒊𝒏𝒕𝒆𝒏𝒂𝒏𝒄𝒆 𝑪𝒐𝒔𝒕 € = 𝑪 𝒎𝟐
(since no replacements will be made)

9. Economics of Lighting 3. Payback
Simple Payback = Difference in Investment Costs ( IC )
Difference in Annual Savings ( OC+MC )
Simple payback period does not take into account the time value of money, which is a serious drawback since it can lead to wrong decisions in projects with long payback times (>5 years), and/or large discount rates

10. Economics of Lighting 3. Payback
Discounted Payback A variation of payback method that attempts to remove this drawback is called discounted payback period method. If the discount rate is i, the discounted savings of year n are given by: 𝐷𝑖𝑠𝑐𝑜𝑢𝑛𝑡𝑒𝑑 𝑠𝑎𝑣𝑖𝑛𝑔𝑠= 𝐴𝑛𝑛𝑢𝑎𝑙 𝑉𝑎𝑙𝑢𝑒 𝑜𝑓 𝑆𝑎𝑣𝑖𝑛𝑔𝑠 (1+𝑖) 𝑛 .
i is the interest rate or discount rate, which reflects the cost of tying up capital and may also allow for the risk that the payment may not be received in full.
The lifecycle savings are calculated by summing the discounted savings over the years. The Discounted Payback period is the number of years for the sum of the discounted savings to be equal or greater than the difference in investment costs, and because of the reduced time value of future savings, is larger than the simple payback period.

11. Economics of Lighting 3. Payback
Simple Payback
𝑃𝑎𝑦𝑏𝑎𝑐𝑘 𝑃𝑒𝑟𝑖𝑜𝑑(𝑦𝑒𝑎𝑟𝑠)= ∆𝐼𝐶 ∆𝑂𝐶+ ∆𝑀𝐶 𝐿 𝑃 ℎ
𝑳 𝑷 𝒉 gives the projects lifetime in years
∆𝐼𝐶 - difference in Investment Cost
∆𝑂 - difference in anual Operating Cost
∆𝑀𝐶 - difference in Maintenance Costs during the project lifetime

12. Economics of Lighting 4. LCC calculation - Example
City X would like to examine a proposed street lighting retrofit project replacing 10, W High Pressure Sodium (HPS) lights with 60W LED lights
City X especially wants to know:
Expected cost of project
Energy savings (€) annually
Payback period

13. Economics of Lighting 4. LCC calculation - Example
Installation characteristics
Halogen
LED
Number of lamps
10 000
Lamp Luminous flux (lm)
16 500
6 000
Lamp Efficacy (lm/W)
100
Lamp Power (W)
150 60
Lamp + Ballast/Driver Power (W)
163.5 69
Luminaire Efficacy Factor (lm/W) 66 87
Lifetime (hours)
20 000
80 000
Annual operating hours
4 200
Cost (€)
3,00
200,0
Installation Cost (€) 5

14. Economics of Lighting 4. LCC calculation - Example
Initial Cost (IC) Calculation
Number of luminaires (n)
Luminaire price including lamp(CL)
Installation costs per luminaire (CI):
𝑰𝑪 𝑯𝑷𝑺 =𝟎
Existing installation
𝑰𝑪 𝑳𝒆𝒅 =𝒏× 𝑪 𝑳 + 𝑪 𝑰 =𝟏𝟎𝟎𝟎𝟎× 𝟐𝟎𝟎,𝟎𝟎+𝟓 =𝟐 𝟎𝟓𝟎 𝟎𝟎𝟎 €

15. Economics of Lighting 4. LCC calculation - Example
Operating Cost (OC)
Number of luminaires (n)
Power per luminaire including lamp and ballast/driver, in Watt (PL)
Electricity cost, €/kWh (CE)
Annual operating hours (h)
𝑶𝑪 𝑯𝑷𝑺 = 𝒏×𝒉× 𝑷 𝑳 × 𝑪 𝑬 𝟏𝟎𝟎𝟎
= 𝟏𝟎 𝟎𝟎𝟎×𝟒 𝟐𝟎𝟎×𝟏𝟔𝟑,𝟓×𝟎,𝟏𝟓 𝟏 𝟎𝟎𝟎 =𝟏 𝟎𝟑𝟎 𝟎𝟓𝟎€
𝑶𝑪 𝑳𝒆𝒅 = 𝒏×𝒉× 𝑷 𝑳 × 𝑪 𝑬 𝟏𝟎𝟎𝟎
= 𝟏𝟎 𝟎𝟎𝟎×𝟒 𝟐𝟎𝟎×𝟔𝟗×𝟎,𝟏𝟓 𝟏 𝟎𝟎𝟎 =𝟒𝟑𝟒 𝟕𝟎𝟎€
Annual operating hours (h)
Annual Electricity Savings of €

16. Economics of Lighting 4. LCC calculation - Example
Maintenance Cost (MC)
Number of luminaires (n)
Lifetime of lamp, in hours (LL)
Lifetime of project, in hours (LP)
Lamp exchange costs, including lamp and work (Cm1)
Other maintenance costs (Cm2) – in this example are considered zero
𝑴𝑪 𝑯𝑷𝑺 =𝒏× 𝑳 𝑷 𝑳 𝑳 × 𝑪 𝒎𝟏 + 𝑪 𝒎𝟐
=𝟏𝟎𝟎𝟎𝟎× 𝟖𝟎 𝟎𝟎𝟎 𝟐𝟎 𝟎𝟎𝟎 ×𝟖,𝟎𝟎+𝟎=𝟑𝟐𝟎 𝟎𝟎𝟎€
𝑴𝑪 𝑳𝒆𝒅 = 𝑪 𝒎𝟐 =𝟎

17. Economics of Lighting 4. LCC calculation - Example
LifeCycle Cost (LCC)
𝑳𝑪𝑪 𝑯𝑷𝑺 = 𝑰𝑪 𝑯𝑷𝑺 + 𝑶𝑪 𝑯𝑷𝑺 × 𝐿 𝑃 ℎ + 𝑴𝑪 𝑯𝑷𝑺 =𝟎+𝟏 𝟎𝟑𝟎 𝟎𝟓𝟎×𝟏𝟗+𝟑𝟐𝟎 𝟎𝟎𝟎=𝟏𝟗 𝟖𝟗𝟎 𝟗𝟓𝟎€
𝑳𝑪𝑪 𝑳𝒆𝒅 = 𝑰𝑪 𝑳𝒆𝒅 + 𝑶𝑪 𝑳𝒆𝒅 × 𝐿 𝑃 ℎ + 𝑴𝑪 𝑳𝒆𝒅 =𝟐 𝟎𝟓𝟎 𝟎𝟎𝟎+𝟒𝟑𝟒 𝟕𝟎𝟎×𝟏𝟗+𝟎=𝟏𝟎 𝟑𝟎𝟗 𝟑𝟎𝟎€

18. Economics of Lighting 4.Simple payback calculation
𝑷𝒂𝒚𝒃𝒂𝒄𝒌 𝑷𝒆𝒓𝒊𝒐𝒅 𝒚𝒆𝒂𝒓𝒔 = ∆𝐼𝐶 ∆𝑂𝐶+ ∆𝑀𝐶 𝐿 𝑃 ℎ
= 𝐼𝐶 𝐿𝑒𝑑 − 𝐼𝐶 𝐻𝑃𝑆 𝑂𝐶 𝐻𝑃𝑆 − 𝑂𝐶 𝐿𝑒𝑑 + 𝑀𝐶 𝐻𝑃𝑆 − 𝑀𝐶 𝐿𝑒𝑑 𝐿 𝑃 ℎ
= − −
=3,3 𝑦𝑒𝑎𝑟𝑠

19. Economics of Lighting 5. Online tools
There are online calculation tools that, with varying degrees of complexity, can help in the economic comparison between technology options. Some examples are:

20. Economics of Lighting Energy Efficiency Investments
Best practice for investment
Ring fenced investment budget
Retention of a % of savings for more measures
Appraisal on whole life cycle basis
Retention of a % of savings by relevant department
Maximise support from grants and other external sources
Energy efficiency investments often have to compete directly against other demands for capital budgets and can often lose out to projects that are seen as having greater priority. Consequently, if an organisation’s energy policy objectives are to be met it is likely that capital budgets will need to be specifically allocated to energy efficiency. Many organisations have also found it effective to retain achieved savings in energy costs to fund further measures, which helps sustain the energy programme and provides continuous improvement in energy performance.
Life cycle costing gives the full picture of the value of an energy efficiency project, over its whole life. The energy cost of running most equipment is many times higher than the original purchase price.

21. Economics of Lighting 6. Energy Efficiency Investments
Financial options:
own funding,
third party financing,
leasing,
ESCO financing,
rebates,
incentives
and others.

22. 7. Additional Benefits of Energy-Efficiency
Source-IEA, 2014