## 4 Full Dimensioning of V2G Energy Resource
### Political Dimension  
A. Government support
* Political support: There are currently some incentives in Brazil concerning the implementation of EVs; these always have an appeal focused on the environmental issue. Some current incentives in Brazil are exemption from import taxes, discounts on taxes such as IPVA and IPI and exemption in Rodizio (Sao Paulo). As the technology studied, V2G is still under study and implementation of pilot plans; implementation support is not yet active. Since V2G has a greater integrative capacity between renewable sources and the use of distributed generation, it can be expected to attract political appeal. However, no data are yet available to prove such possibilities.
* Tax discount: There is currently no dimension of the possibilities that can be brought about with the use of V2G and how incentives can be generated. As the technology allows for a \"sale\" of surplus energy to the grid and makes it possible to improve energy quality, it may be the target of incentives such as tax rebates in the future.
* Ownership of the Resource
* Location: Not affected by the negotiation between the distributor and the consumer.
* Technology owner: A mix of national and imported equipment (in which proportion), fully national equipment and equipment fully produced in the region of demand can be imported. It is currently 100% imported, but it can generate demand for national technology as the implementation grows. Regarding technology, we have the equipment to be produced for residential installation. Conversely, the installation service will be national, with a more specialized national workforce.
* Level of Acceptance
* Society and NGOs: Improvement for society due to the reduction in GHGs and improved energy quality. However, the higher cost of implementation is not accessible to all levels of income.
* Governmental: These players do not have a direct relationship with technology, but they are important for its entry and growth in the market, since they can create regulations and invest in infrastructure to make the technology viable. These policy makers can help to stimulate transmission and distribution operators to create their energy storage policies and regulations. They can also make space for ESS regulation, thus supporting for the creation of tax regulations on participants in the electricity production and consumption network.  
General tax settings can impact the implementation of V2G systems. Government policies can also indirectly influence the increase in renewable sources, as well as decarbonization and carbon taxes. These, in turn, have great appeal for storage technology, as seen above, improving the productivity of renewable sources and increasing their yield [19].  
* Consumers: Society can improve due to the reduction of GHGs and improvement in the quality of energy, decrease in the electricity bill of demand and energy storage itself in times of lack of supply.
* Power companies: Due to the improved power quality, improvement in the DEC/FEC indexes becomes a benefit for energy companies, such as utilities. In terms of energy generators, they are mainly renewable energy generators that have a direct connection with the use of V2G technology to improve their productivity.  
This technology brings greater complexity to the system, requiring large installations related to the management and monitoring of the network. Cybersecurity concerns will also be intensified, thus generating greater demand for investments [19].  
The following is a summary of the results from the different dimensions. In this summary, the most important dimensions and aspects for both the demand and supply sides contemplated by the research are separated (refer to Table 4).