diff --git a/htdocs/frontend/index.html b/htdocs/frontend/index.html
index 43f4db9..c34e272 100644
--- a/htdocs/frontend/index.html
+++ b/htdocs/frontend/index.html
@@ -106,6 +106,7 @@
 						<td>
 							<label for="render-points"><input type="radio" id="render-points" name="render" value="points" /> Punkte</label>&nbsp;
 							<label for="render-lines"><input type="radio" id="render-lines" name="render" value="lines" /> Linien</label>
+							<label for="render-steps"><input type="radio" id="render-steps" name="render" value="steps" /> Stufen</label>
 						</td>
 					</tr>
 					<tr>
diff --git a/htdocs/frontend/javascripts/options.js b/htdocs/frontend/javascripts/options.js
index ab7200f..8e9d6ad 100644
--- a/htdocs/frontend/javascripts/options.js
+++ b/htdocs/frontend/javascripts/options.js
@@ -30,7 +30,7 @@ vz.options = {
 	backendUrl: '../backend.php', // TODO default backend, store backend urls in cookies
 	tuples: 300,
 	precission: 2, // TODO update from backend capabilities?
-	render: 'lines',
+	render: 'steps',
 	refresh: false,
 	defaultInterval: 24*60*60*1000, // 1 day
 	timezoneOffset: -(new Date().getTimezoneOffset() * 60000) // TODO add option with timezone dropdown
diff --git a/htdocs/frontend/javascripts/wui.js b/htdocs/frontend/javascripts/wui.js
index 7e6bb9e..88b2f9d 100644
--- a/htdocs/frontend/javascripts/wui.js
+++ b/htdocs/frontend/javascripts/wui.js
@@ -102,6 +102,7 @@ vz.wui.init = function() {
 	// plot rendering
 	$('#render-lines').attr('checked', (vz.options.render == 'lines'));
 	$('#render-points').attr('checked', (vz.options.render == 'points'));
+	$('#render-steps').attr('checked', (vz.options.render == 'steps'));
 	$('input[name=render][type=radio]').change(function() {
 		if ($(this).attr('checked')) {
 			vz.options.render = $(this).val();
@@ -528,7 +529,8 @@ vz.wui.drawPlot = function () {
 		$('#overlay').empty();
 	}
 
-	vz.options.plot.series.lines.show = (vz.options.render == 'lines');
+	vz.options.plot.series.lines.show = (vz.options.render == 'lines' || vz.options.render == 'steps');
+	vz.options.plot.series.lines.steps = (vz.options.render == 'steps');
 	vz.options.plot.series.points.show = (vz.options.render == 'points');
 
 	vz.plot = $.plot($('#flot'), data, vz.options.plot);
diff --git a/lib/Interpreter/MeterInterpreter.php b/lib/Interpreter/MeterInterpreter.php
index 8fc8ce8..06e9338 100644
--- a/lib/Interpreter/MeterInterpreter.php
+++ b/lib/Interpreter/MeterInterpreter.php
@@ -124,7 +124,7 @@ class MeterInterpreter extends Interpreter {
 
 		return array(
 			//($next[0] - $delta / 2), // timestamp in the middle
-			$next[0], // timestamp at the end
+			$last[0], // timestamp at the start
 			$next[1] * (3600000 / (($this->resolution / 1000) * $delta)), // value
 			$next[2] // num of pulses
 		);