var costs = {};
            costs.enrgyHT = 0.06499;
            costs.enrgyLT = 0.03599;
            costs.exciseDuty = 0.00305;
            costs.contrib67ActEZ = 0.00050;
            costs.ntwrkChrgHT = 0.04177;
            costs.ntwrkChrgLT = 0.03219;
            costs.taxFactor = 1.22;
            var cumuEnrgyHT = 0;
            var cumuEnrgyLT = 0;
			var cumuEnrgy = 0;
            var cumulativeCostArray = [];

            chart1Series.powerTotal.forEach(function (point) {
                var enrgy = point[1] / 1000;
                var timestamp = new Date(point[0]);
                if (isHighTariff(timestamp)) {
                    var cost = enrgy * (costs.enrgyHT + costs.exciseDuty + costs.contrib67ActEZ + costs.ntwrkChrgHT) * costs.taxFactor;
                    cumuEnrgyHT += enrgy;
                }
                else {
                    var cost = enrgy * (costs.enrgyLT + costs.exciseDuty + costs.contrib67ActEZ + costs.ntwrkChrgLT) * costs.taxFactor;
                    cumuEnrgyLT += enrgy;
                }
                cost = parseFloat(cost.toFixed(2));

                if (!chart3Series.cumulativeCost.length)
                    chart3Series.cumulativeCost.push([point[0], cost]);
                else
                    chart3Series.cumulativeCost.push([point[0], cost + chart3Series.cumulativeCost[chart3Series.cumulativeCost.length - 1][1]]);

				cumuEnrgy += enrgy;
				var cumuEnrgyKW = parseFloat((cumuEnrgy / 1000).toFixed(2));
				if (!chart3Series.cumulativeEnergy.length)
                    chart3Series.cumulativeEnergy.push([point[0], cumuEnrgyKW]);
                else
                    chart3Series.cumulativeEnergy.push([point[0], cumuEnrgyKW + chart3Series.cumulativeEnergy[chart3Series.cumulativeEnergy.length - 1][1]]);
            });