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Tsankov, et al.

Table 8. Results of energy and economic calculations for the current investment project
Parameter Unit Town Total
Pavlikeni Byala Cherkva
Energy consumption before the project kWh/year C532,355 158,138 690,493
Energy consumption after the project kWh/year 105,385 36,025 141,411
Investment (new luminaires) BGN 354,452 113,257 467,709
Investment (control system, cabinets) BGN 76,500 16,500 93,000
Investment (PV-powered luminaires) BGN 7,200 - 7,200
Installation works BGN 64,249 14,581 78,830
Total investment (+5% unforeseen costs) BGN 528,282 151,733 680,015
Energy savings kWh/year 426,970 122,113 549,082
Energy savings percentage % 80.2 77.2 79.5
Average electricity price BGN/kWh 0.1991 0.1991 0.1991
Cost savings BGN/year 85,027 24,318 109,344
Payback period years 6.21 6.24 6.22
CO emissions saved tCO /year 1,049 300 1,349
2
2
Investment efficiency BGN/tCO 2 503.57 505.72 504.05
Abbreviations: CO : Carbon dioxide; PV: Photovoltaic.
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Table 9. “Renewable Energy, Energy Efficiency, Energy Security” program indicators
Indicator Unit Pavlikeni Byala Cherkva Total
Estimated annual CO reduction tCO /year 1,049 300 1,349
2
2
Estimated annual energy savings MWh/year 427 122 549
Estimated annual cost savings EUR/year 43,474 12,433 55,907
People benefiting (men) persons 4,569 820 5,389
People benefiting (women) persons 4,893 849 5,742
Total beneficiaries persons 9,462 1,669 11,131
Abbreviations: CO : Carbon dioxide; EUR: Euro.
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indicators illustrating the contribution of the project to 5. Conclusion
improved energy efficiency in buildings, industry, and
municipalities. The LED retrofit project implemented in the
The analysis of the results presented in Table 9 municipalities of Pavlikeni and Byala Cherkva
demonstrates that, through detailed project design highlights the transformative potential of high-efficiency
and optimization of the energy-saving measures lighting technologies combined with intelligent control
proposed in the Energy Efficiency Audit Report, and management systems. Achieving over 79% energy
the project implemented technical solutions that savings, substantial CO emission reductions, and
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significantly improve the values of the technical, a favorable economic payback period, the initiative
economic, and program-specific indicators defined by exemplifies a holistic approach to sustainable public
the “Renewable Energy, Energy Efficiency, Energy infrastructure. This study offers a replicable blueprint
Security” program under the European Economic for municipalities across Central and Eastern Europe
Area Financial Mechanism 2014–2021, Procedure and holds relevance for urban planners and energy
No. BGENERGY-2.001, titled “Rehabilitation and efficiency stakeholders worldwide seeking scalable
Modernization of Municipal Infrastructure—Systems solutions that align with contemporary environmental
for Outdoor Artificial Lighting in Municipalities.” standards.

Volume 22 Issue 6 (2025) 194 doi: 10.36922/AJWEP025310242