Google Apps Scripts to access Flukso.net data. This can be used in a Google Spreadsheet.

flukso.gs

/**
 *  Access Flukso API server returning a JSON
 * 
 */
function getJSON(sensor, token, query) {
  var sheetname = "test";
  //var aUrl = "http://api.flukso.net/sensor/c1411c6b4f9910bbbab09f145f8533b9?version=1.0&token=d8a8ab8893ea73f768b66b45234b5c3a&interval=month&unit=watt";
  var api="1.0";
  var aUrl = "http://api.flukso.net/sensor/"+sensor+"?version="+api+"&token="+token+query;
  
  var headers = {
    "Accept": "application/json",
  };
  var options = {
    "method": "get",
    "headers": headers,
  };
  var response = UrlFetchApp.fetch(aUrl); // get feed
  
  return JSON.parse(response.getContentText());
  
}

/**
 * Get information from Flukso, day resolution
 */
function getKWhMonth(sensor,token, start, end) {
  
  // Prepare query for API server
  
  var days = end - start;
  start = convertDate(start);
  end = convertDate(end);
  
  var query = "&start=" + start +"&end=" + end +"&resolution=day&unit=watt";
  
  var data=getJSON(sensor, token, query);
  
  var sum = 0;
  for (var i = 0; i < data.length; i++) {
    
    // data[x] = [ Unix date, Watt]
    // so, use the second parameter [1]
    if (typeof data[i][1] == "number")
      sum = sum + data[i][1];
  }
  
  // Average KWh
  return ((sum *24)/1000);
}

/**
 * Get information from Flukso, hour resolution
 */
function getKWhDay(sensor,token, start, end) {
  
  // Prepare query for API server
  
  //var days = end - start;
  start = convertDate(start);
  end = convertDate(end);
  
  var query = "&start=" + start +"&end=" + end +"&resolution=hour&unit=watt";
  
  var data=getJSON(sensor, token, query);
  
  var sum = 0;
  for (var i = 0; i < data.length; i++) {
    
    // data[x] = [ Unix date, Watt]
    // so, use the second parameter [1]
    if (typeof data[i][1] == "number")
      sum = sum + data[i][1];
  }
  
  // Average KWh
  return (sum/1000);
}


/**
 * Converts a given date number to Unix timestamp
 * (seconds from Jan-1-1970)
 * Accounts for Timezone Offset
 */
function convertDate(dateNumber) {
  
  var ret = Date.parse(dateNumber);
  var dat = new Date(ret); 
  var offset = dat.getTimezoneOffset() * 60; // seconds
  // return seconds instead of milliseconds
  return (ret /1000) - offset;

}

/**
 * Calculate coast of consumption based on
 * 
 * 1) KWh coast and company consuption reading
 *
 * or
 *
 * 2) Previous KWh coast and flukso actual reading
 */
function custo(companyRead,fluksoRead,custoActual,custoPrevious) {
  
  var ret = 0;
  if (((companyRead != "") && (typeof companyRead == "number")) && 
      ((custoActual != "") && (typeof custoActual == "number"))) {
    
     ret = companyRead * custoActual; 
  } else {
    
    if (((fluksoRead != "") && (typeof fluksoRead == "number")) && 
        ((custoActual != "") && (typeof custoActual == "number"))) {
        
        ret = fluksoRead * custoActual;
    } else {
      
      if (((fluksoRead != "") && (typeof fluksoRead == "number")) )//&& 
//        ((custoPrevious != "") && (typeof custoPrevious == "number"))) 
          ret = fluksoRead * custoPrevious;
    }
  }
  
  return (ret>0) ? ret : "";
}

/**
 * Adds a custom menu to the active spreadsheet, containing a single menu item
 * for invoking the readRows() function specified above.
 * The onOpen() function, when defined, is automatically invoked whenever the
 * spreadsheet is opened.
 * For more information on using the Spreadsheet API, see
 * https://developers.google.com/apps-script/service_spreadsheet
 */
/*function onOpen() {
  var sheet = SpreadsheetApp.getActiveSpreadsheet();
  var entries = [{
    name : "getJson",
    functionName : "getJson"
  }];
  sheet.addMenu("Script Center Menu", entries);
};*/

I used this snippet to build a spreadsheet that grabs information from Flukso.net (who holds my Fluksometer data) and compare it to my electricity monthly bill. The template of this spreadsheet is available at: https://drive.google.com/previewtemplate?id=0Anjfupsi3t5DdEd4eVh1RVV5cktiTTM3SFlJa0ZqY0E&mode=public