**8. Conclusions**

104 Sustainable Growth and Applications in Renewable Energy Sources

Table 5 shows the obtained results. The table is divided into two columns for each demand scenario and two rows for each municipality. The sub-columns show the obtained results considering: 1) the individual solution (one generation equipment per household); 2) the solution with microgrids with one type of wind turbines (the type used in the real projects, Air X) and 3) the solution with microgrids with 4 types of wind turbines (the type used in the real projects, Air X, and 3 more powerful ones). The sub-rows present the investment cost, the difference of the cost of individual generators in the low demand scenario, the total energy, wind turbines used, the microgrids and the number of users in each one and

(140Wh/day; 100W)

Microgrid

(%) - -8,0% -13,2% 36,0% 35,3% 17,3%

8 (Air X) 2 (Whis. 100)

> 1 (4) 1 (3) 2 (2)

Total cost [\$] 14447 13886 13886 16447 16867 15867

[Wh/day] 4641 3381 3381 5185 5196 5161

(%) - -3,9% -3,9% 13,8% 16,8% 9,8%

10 (Air X) 8 (Air X) 8 (Air X) 12 (Air X) 12 (Air X)

(users) - 3 (2) 3 (2) - 1 (2) 1 (2)

Table 5. Analysis of the electrification solutions of Turco and Challapata with microgrids.

Total cost [\$] 19423 17862 16862 26423 26277 22777

[Wh/day] 4460 4234 4166 6086 6124 6227

(4 w.t.) Individual Microgrid

20 (Air X) 20 (Air X)


13 2 2 13 2 2

9 3 3 9 7 7

(1 w.t.)

1 (4) 1 (3) 2 (2)

13 (Air X) 12 (Air X)

High Energy Demand (280Wh/day; 200W)

(1 w.t.)

1 (4) 1 (3) 2 (2) Microgrid (4 w.t.)

7 (Air X) 3 (Whis. 100) 1 (Whis. 200)

> 1 (4) 1 (3) 2 (2)

9 (Air X) 1 (Whis. 100)

1 type of inverter: cost \$ 255, power 350W.

Low Energy Demand

Individual Microgrid

1 type of meter: cost \$ 50.

number of individual users.

Difference

Energy

Wind turbine (type)

Microgrids

Individual users

Difference

Energy

Wind turbine (type)

Microgrids

Individual users

(users) -

Turco

Challapata

This article aims to describe and evaluate two wind generation projects implemented in Bolivia, in the municipalities of Turco and Challapata, department of Oruro. This multicriteria evaluation was conducted when the systems had been running for one year by an external evaluation team. The results of the evaluation showed that the project has achieved its main objectives giving a weighted mark 89.33%, which corresponds to a qualitative assessment of "functioning under optimal conditions." This confirms that renewable energy is the best choice for access to modern energy in isolated communities.

Among the main strengths of the project s the positive acceptance of the beneficiaries and access to electricity in remote areas must be highlighted. The main weaknesses of the project are the bureaucracy that slows down municipal governments and internal conflicts among beneficiaries. The assessment highlighted limitations in the systems that must be resolved in future projects, for instance, the training should be extensive in time. The biggest risk is long term sustainability if the municipalities do not fulfil their commitments.

Furthermore, alternative designs were analyzed with microgrids to improve some of the drawbacks identified in the assessment: the continuity of supply against breakdowns, supply of electricity to non-permanent residents and the possible increase in energy supply to cover more applications. The results recommend taking advantage of microgrids for projects in future, to feed groups of households, improve the quality of electric service and reduce costs.
