One of the major challenges that the energy system is facing is how 100% renewable electricity generation should be designed and controlled. So far, utility-scale solar PV power parks (PV parks), have dominated the international market and is expected to grow in Sweden. In order for this expansion to thrive it needs to be done resource- and system efficiently. In this study, a methodology for a utility-scale solar guide (from Swedish ‘Solbruksplan’) is developed. It is done by electrical grid simulations and geographical analysis in order to find strategic places for PV parks, without grid reinforcements, using Herrljunga municipality as a case study. The electrical grid is analyzed through power flow simulations and the geographical assessment is done by multi-criteria analysis (MCA) with a Boolean approach. Three different sizes of PV parks, 1, 3, and 5 MWp, were simulated and assessed. The results show that 8.6 % of the municipality, or 78,500 m2 per substation, is suitable for 1 MWp PV parks. The majority of the grid’s substations (about 90 %) also has enough capacity for a PV park of 1 MWp. Furthermore, the grid can host PV parks of 3 and 5 MWp, but limited to the proximity of the urban areas. However, 3 and 5 MWp are not suitable due to limited land availability in urban areas. The results highlight that a utility-scale solar guide can be used to identify possible areas for PV parks, considering geography and grid capacity. Furthermore, it can work as a tool for utility companies, municipalities, PV companies, and land-owners to find resource- and system efficient locations for PV parks.