With the demand far outstripping the electricity generation in the country, many industries are now looking at alternatives based on the guidelines and roadmaps given by various forums and government bodies for clean energy generation. Besides, cross subsidies, higher tariff, power outages, load shedding and inconsistent quality of power supplied by utilities are other factors that adversely affect such industries. With India emerging as an IT/BPO hub, erratic power supply hampers the business process, which ultimately reflects on the countryвЂ™s economy. The statistics show that approximately 38В % of the total electric energy production is being consumed by the industrial sector, which is playing a crucial role in the economic growth of the country. Nowadays, the country is promoting renewable energy to augment the total power supply and to meet the rural needs either by augmenting grid supply or by off-grid supply. Besides, low-carbon generation systems bring competition in electricity markets and are in turn improves the countryвЂ™s sustenance and economy. In 2008, with the announcement of the National Action Plan on Climate Change (NAPCC), there is a marked shift in policy to diversify the energy mix to the lower carbon intensity. In chorus, attention is being paid to that the growth should be in a sustainable manner while addressing the climatic change concerns. One blaring result of its meteoric growth is the widening gap between the energy demand and the supply therefore, the government is paying increased focus to bridge the gap by capacity addition. India, a dwelling place for 1.21 billion people, which is over 17В % of the worldвЂ™s population, has a seemingly unquenchable thirst for energy.

The green and hybrid power system designed can be adaptable to any critical and large consumers of urban buildings. Finally, an energy management strategy is developed for the optimal system to ensure reliable power during contingency and disturbances. Sensitivity results indicate that the system is optimal and adaptable in a certain range of unanticipated variances with respect to best estimated value. From the simulation result, it is observed that the designed system is cost effective and environment friendly, which leads to 6.18В % annual cost savings and reduces CO 2 emissions by 38.3В %. Sensitivity analysis is performed to deal with uncertainties such as the increase in electricity consumption and grid tariff, environmental changes, etc. This building is associated with 3.4В MWh/day priority load (peak load as 422В kW), as well as 3.3В MWh/day deferrable load (peak load as 500В kW).

The logic is illustrated with a case study based on the practical data of a building located in southern India. The system is modeled and the optimal system configuration is estimated with the help of hybrid optimization model for electric renewables (HOMER). With a view to promote renewable energy sources, photovoltaics and wind turbines are integrated with the grid connected building. The objective of this paper is to model a hybrid power system for buildings, which is technically feasible and economically optimal.

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