n/helen.md: think of Helen / electricity stock pricing

Resolves: #302

n/helen.md

@@ -0,0 +1,32 @@
+---
+layout: null
+permalink: /n/helen.html
+sitemap: true
+month: 10
+monthly: "32,35 c/kWh"
+basictransfer: "5.51 €/month"
+transfermargin: "4.07 c/kWh"
+basicstock: "3,93 €"
+stockmargin: "0,38 c/kWh"
+cheapelectricity: "??.?? c/kWh"
+---
+
+# Thinking on Helen price
+
+*Or more like playing with Jekyll*
+
+Helen's monthly market price for {{ page.month }}. month is {{ page.monthly }}.
+
+* Transfer price: {{ page.basictransfer }} and {{ page.transfermargin }}.
+* Stock price: {{ page.basicstock }} and {{ page.stockmargin }}.
+
+## Plan for Tuntihinta
+
+* Expensive: <strong>{{ page.monthly }} + {{ page.transfermargin }}</strong> (The monthly plan + transfer margin)
+* Margin: <strong>{{ page.transfermargin }} + {{ page.stockmargin }}</strong> (Transfer fee (c/kWh + stock margin)
+
+## Sources
+
+* Definition of monthly plan price: https://www.helen.fi/sahko/sahkosopimus/markkinahinta and https://www.helen.fi/en/electricity/electricity-products-and-prices/marketpriceelectricity
+  * They use it all month following stock market price and trying to get their own citation.
+* Transfer is in *Oma Helen* and changes are announced in their newspaper.