## 3 Results
### Monthly and Weekly Energy Balance of the Households  
As heat pumps were employed in PMC, the electricity consumption obviously increased considerably in winter, and the PV production decreased, as shown in Table 5. In January, the production of \(\upmu\)-CHP was highest and decreased until September (except April). This highest peak seems to be the first trial of \(\upmu\)-CHP for the pilot, as afterwards the values settled between 85 and 105 kWh/household for the winter. Despite the fact that the highest PV production occurred in May, the lowest grid import happened in April, taking into account \(\upmu\)-CHP, otherwise in August for the group of households with only heat pumps.  
To focus on the import from the grid, given as averages with higher resolution, Figure 4 shows the weekly variations of electricity purchase, PV, and \(\upmu\)-CHP output in Figure 4a-c, respectively. Figure 4a shows that the average weekly electricity purchase per household (households with HP and \(\upmu\)-CHP) varied slightly throughout the year, except for holiday weeks, as the last week of December and the beginning of the August, where the users were expected to be away. The average value of weekly electricity purchased is 78 kWh per household vs. 96 kWh consumed, which shows the amount of self-consumption. The PV output (Figure 4b) and \(\upmu\)-CHP (Figure 4c) succeeded relatively to keeping the electricity purchase from the grid relatively constant although the seasonal consumption varied a lot in PMC and in most western countries such as the Netherlands.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**kWh/HH** & & **Min** & **Average** & **Max** \\ \hline \multirow{4}{*}{**Production**} & Delivery Low rate & 144 & 350 & 937 \\  & Delivery Normal Rate & 32 & 247 & 427 \\  & \(\upmu\)-CHP & 292 & 950 & 1396 \\  & PV & 152 & 866 & 1858 \\  & Total Production & 350 & 1277 & 2832 \\ \hline \multirow{4}{*}{**Consumption**} & Purchase Low rate & 712 & 1997 & 3587 \\  & Purchase Normal rate & 964 & 2291 & 3332 \\  & Self-Consumption & 247 & 935 & 1626 \\  & Total Consumption & 2193 & 5183 & 8188 \\ \hline \end{tabular}
\end{table}
Table 4: Minimum, average, and maximum values for the PMC Households for the year 2012.  
Figure 3: PowerMatching City electricity summary for the year 2012 per household.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**kWW/HH** & \multicolumn{2}{c}{**Consumption**} & \multicolumn{2}{c}{**Production**} & \multicolumn{2}{c}{**Grid Import \({}^{*}\)**} \\ \hline
**Month** & **Min.** & **Mean** & **Max** & **PV** & \(\mu\)**-CHP** & **Only PV** & **PV + \(\mu\)**-CHP** \\ \hline Jan & 167 & 516 & 824 & 27 & 217 & 489 & 271 \\ Feb & 148 & 466 & 633 & 28 & 90 & 438 & 347 \\ Mar & 89 & 479 & 561 & 66 & 69 & 413 & 344 \\ Apr & 152 & 347 & 645 & 96 & 92 & 251 & 159 \\ May & 99 & 346 & 512 & 137 & 26 & 209 & 183 \\ June & 96 & 326 & 473 & 95 & 20 & 231 & 211 \\ July & 121 & 330 & 708 & 109 & 17 & 221 & 205 \\ Aug & 55 & 296 & 509 & 113 & 17 & 183 & 166 \\ Sep & 149 & 321 & 637 & 83 & 52 & 288 & 186 \\ Oct & 146 & 529 & 570 & 44 & 88 & 485 & 398 \\ Nov & 146 & 520 & 579 & 25 & 106 & 495 & 389 \\ Dec & 125 & 561 & 640 & 9 & 102 & 552 & 451 \\ \hline \hline \end{tabular}  
* according to the production subtracted from the mean consumption value.  
\end{table}
Table 5: Monthly electricity consumption, production, and grid import on average per household for 12 households with heat pumps and 10 households with \(\mu\)-CHP.  
Figure 4: PowerMatching City (PMC) weekly values of (**a**) electricity purchase, (**b**) PV output, and (**c**) \(\mu\)-CHP (micro-combined heat and power) power generation.