diff --git a/configure.ac b/configure.ac
index 3b16f84..2af3e09 100644
--- a/configure.ac
+++ b/configure.ac
@@ -207,6 +207,12 @@
                  ["$PYTHON \${top_srcdir}/monitor/gen-fan-monitor-defs.py \
                   -m $FAN_MONITOR_YAML_FILE"])
     ])
+
+    AC_ARG_VAR(NUM_MONITOR_LOG_ENTRIES, [Maximum number of entries in the message log])
+    AS_IF([test "x$NUM_MONITOR_LOG_ENTRIES" == "x"], [NUM_MONITOR_LOG_ENTRIES=75])
+    AC_DEFINE_UNQUOTED([NUM_MONITOR_LOG_ENTRIES], [$NUM_MONITOR_LOG_ENTRIES],
+                       [Maximum number of entries in the message log])
+
     AC_CONFIG_FILES([monitor/Makefile])
 ])
 
diff --git a/monitor/Makefile.am b/monitor/Makefile.am
index ecfab71..2c7a7fa 100644
--- a/monitor/Makefile.am
+++ b/monitor/Makefile.am
@@ -7,6 +7,8 @@
 phosphor_fan_monitor_SOURCES = \
 	argument.cpp \
 	fan.cpp \
+	power_interface.cpp \
+	logging.cpp \
 	main.cpp \
 	tach_sensor.cpp \
 	conditions.cpp \
diff --git a/monitor/logging.cpp b/monitor/logging.cpp
new file mode 100644
index 0000000..1463bc6
--- /dev/null
+++ b/monitor/logging.cpp
@@ -0,0 +1,30 @@
+/**
+ * Copyright © 2020 IBM Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "config.h"
+
+#include "logging.hpp"
+
+namespace phosphor::fan::monitor
+{
+
+Logger& getLogger()
+{
+    static Logger logger{NUM_MONITOR_LOG_ENTRIES};
+
+    return logger;
+}
+
+} // namespace phosphor::fan::monitor
diff --git a/monitor/logging.hpp b/monitor/logging.hpp
new file mode 100644
index 0000000..dbd2b8c
--- /dev/null
+++ b/monitor/logging.hpp
@@ -0,0 +1,13 @@
+#pragma once
+
+#include "logger.hpp"
+
+namespace phosphor::fan::monitor
+{
+/**
+ * @brief Returns the singleton Logger class
+ *
+ * @return Logger& - The logger
+ */
+Logger& getLogger();
+} // namespace phosphor::fan::monitor
diff --git a/monitor/power_interface.cpp b/monitor/power_interface.cpp
new file mode 100644
index 0000000..372993f
--- /dev/null
+++ b/monitor/power_interface.cpp
@@ -0,0 +1,41 @@
+/**
+ * Copyright © 2020 IBM Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "power_interface.hpp"
+
+#include "sdbusplus.hpp"
+
+namespace phosphor::fan::monitor
+{
+
+constexpr auto systemdService = "org.freedesktop.systemd1";
+constexpr auto systemdPath = "/org/freedesktop/systemd1";
+constexpr auto systemdMgrIface = "org.freedesktop.systemd1.Manager";
+
+void PowerInterface::softPowerOff()
+{
+    util::SDBusPlus::callMethod(systemdService, systemdPath, systemdMgrIface,
+                                "StartUnit", "obmc-host-shutdown@0.target",
+                                "replace");
+}
+
+void PowerInterface::hardPowerOff()
+{
+    util::SDBusPlus::callMethod(
+        systemdService, systemdPath, systemdMgrIface, "StartUnit",
+        "obmc-chassis-hard-poweroff@0.target", "replace");
+}
+
+} // namespace phosphor::fan::monitor
diff --git a/monitor/power_interface.hpp b/monitor/power_interface.hpp
new file mode 100644
index 0000000..1a339c5
--- /dev/null
+++ b/monitor/power_interface.hpp
@@ -0,0 +1,59 @@
+#pragma once
+
+namespace phosphor::fan::monitor
+{
+
+/**
+ * @class PowerInterfaceBase
+ *
+ * The base class that contains the APIs to do power offs.
+ * This is required so it can be mocked in testcases.
+ */
+class PowerInterfaceBase
+{
+  public:
+    PowerInterfaceBase() = default;
+    virtual ~PowerInterfaceBase() = default;
+    PowerInterfaceBase(const PowerInterfaceBase&) = delete;
+    PowerInterfaceBase& operator=(const PowerInterfaceBase&) = delete;
+    PowerInterfaceBase(PowerInterfaceBase&&) = delete;
+    PowerInterfaceBase& operator=(PowerInterfaceBase&&) = delete;
+
+    /**
+     * @brief Perform a soft power off
+     */
+    virtual void softPowerOff() = 0;
+
+    /**
+     * @brief Perform a hard power off
+     */
+    virtual void hardPowerOff() = 0;
+};
+
+/**
+ * @class PowerInterface
+ *
+ * Concrete class to perform power offs
+ */
+class PowerInterface : public PowerInterfaceBase
+{
+  public:
+    PowerInterface() = default;
+    ~PowerInterface() = default;
+    PowerInterface(const PowerInterface&) = delete;
+    PowerInterface& operator=(const PowerInterface&) = delete;
+    PowerInterface(PowerInterface&&) = delete;
+    PowerInterface& operator=(PowerInterface&&) = delete;
+
+    /**
+     * @brief Perform a soft power off
+     */
+    void softPowerOff() override;
+
+    /**
+     * @brief Perform a hard power off
+     */
+    void hardPowerOff() override;
+};
+
+} // namespace phosphor::fan::monitor
diff --git a/monitor/power_off_action.hpp b/monitor/power_off_action.hpp
new file mode 100644
index 0000000..05d4ff6
--- /dev/null
+++ b/monitor/power_off_action.hpp
@@ -0,0 +1,327 @@
+#pragma once
+
+#include "logging.hpp"
+#include "power_interface.hpp"
+
+#include <fmt/format.h>
+
+#include <sdeventplus/clock.hpp>
+#include <sdeventplus/event.hpp>
+#include <sdeventplus/utility/timer.hpp>
+
+#include <chrono>
+
+namespace phosphor::fan::monitor
+{
+
+/**
+ * @class PowerOffAction
+ *
+ * This is the base class for a power off action, which is
+ * used by the PowerOffRule class to do different types of
+ * power offs based on fan failures.
+ *
+ * The power off is started with the start() method, and the
+ * derived class may or may not allow it to be stopped with
+ * the cancel() method, which is really only useful when
+ * there is a delay before the power off.
+ *
+ * It uses the PowerInterfaceBase object pointer to perform
+ * the D-Bus call to do the power off, so it can be mocked
+ * for testing.
+ */
+class PowerOffAction
+{
+  public:
+    PowerOffAction() = delete;
+    virtual ~PowerOffAction() = default;
+    PowerOffAction(const PowerOffAction&) = delete;
+    PowerOffAction& operator=(const PowerOffAction&) = delete;
+    PowerOffAction(PowerOffAction&&) = delete;
+    PowerOffAction& operator=(PowerOffAction&&) = delete;
+
+    /**
+     * @brief Constructor
+     *
+     * @param[in] name - The action name.  Used for tracing.
+     * powerInterface - The object used to invoke the power off.
+     */
+    PowerOffAction(const std::string& name,
+                   std::shared_ptr<PowerInterfaceBase> powerInterface) :
+        _name(name),
+        _powerIface(std::move(powerInterface)),
+        _event(sdeventplus::Event::get_default())
+    {}
+
+    /**
+     * @brief Starts the power off.
+     *
+     * Though this occurs in the child class, usually this
+     * involves starting a timer and then powering off when it
+     * times out.
+     */
+    virtual void start() = 0;
+
+    /**
+     * @brief Attempts to cancel the power off, if the derived
+     *        class allows it, and assuming the power off hasn't
+     *        already happened.
+     *
+     * The 'force' parameter is mainly for use when something else
+     * powered off the system so this action doesn't need to run
+     * anymore even if it isn't usually cancelable.
+     *
+     * @param[in] force - If the cancel should be forced
+     *
+     * @return bool - If the cancel was allowed/successful
+     */
+    virtual bool cancel(bool force) = 0;
+
+    /**
+     * @brief If the power off action is currently in progress, which
+     *        usually means it's still in the delay time before the
+     *        power off D-Bus command is executed.
+     *
+     * @return bool - If the action is active
+     */
+    bool active() const
+    {
+        return _active;
+    }
+
+    /**
+     * @brief Returns the name of the action
+     *
+     * @return const std::string& - The name
+     */
+    const std::string& name() const
+    {
+        return _name;
+    }
+
+  protected:
+    /**
+     * @brief The name of the action, which is set by the
+     *        derived class.
+     */
+    const std::string _name;
+
+    /**
+     * @brief If the action is currently active or not.
+     */
+    bool _active = false;
+
+    /**
+     * @brief The object used to invoke the power off with.
+     */
+    std::shared_ptr<PowerInterfaceBase> _powerIface;
+
+    /**
+     * @brief The event loop object. Needed by timers.
+     */
+    sdeventplus::Event _event;
+};
+
+/**
+ * @class HardPowerOff
+ *
+ * This class is derived from the PowerOffAction class
+ * and will execute a hard power off after some delay.
+ */
+class HardPowerOff : public PowerOffAction
+{
+  public:
+    HardPowerOff() = delete;
+    ~HardPowerOff() = default;
+    HardPowerOff(const HardPowerOff&) = delete;
+    HardPowerOff& operator=(const HardPowerOff&) = delete;
+    HardPowerOff(HardPowerOff&&) = delete;
+    HardPowerOff& operator=(HardPowerOff&&) = delete;
+
+    /**
+     * @brief Constructor
+     *
+     * @param[in] delay - The amount of time in seconds to wait before
+     *                    doing the power off
+     * @param[in] powerInterface - The object to use to do the power off
+     */
+    HardPowerOff(uint32_t delay,
+                 std::shared_ptr<PowerInterfaceBase> powerInterface) :
+        PowerOffAction("Hard Power Off: " + std::to_string(delay) + "s",
+                       powerInterface),
+        _delay(delay),
+        _timer(_event, std::bind(std::mem_fn(&HardPowerOff::powerOff), this))
+    {}
+
+    /**
+     * @brief Starts a timer upon the expiration of which the
+     *        hard power off will be done.
+     */
+    void start() override
+    {
+        _timer.restartOnce(_delay);
+    }
+
+    /**
+     * @brief Cancels the timer.  This is always allowed.
+     *
+     * @param[in] force - If the cancel should be forced or not
+     *                    (not checked in this case)
+     * @return bool - Always returns true
+     */
+    bool cancel(bool) override
+    {
+        if (_timer.isEnabled())
+        {
+            _timer.setEnabled(false);
+        }
+
+        // Can always be canceled
+        return true;
+    }
+
+    /**
+     * @brief Performs the hard power off.
+     */
+    void powerOff()
+    {
+        getLogger().log(
+            fmt::format("Action '{}' executing hard power off", name()));
+        _powerIface->hardPowerOff();
+    }
+
+  private:
+    /**
+     * @brief The number of seconds to wait between starting the
+     *        action and doing the power off.
+     */
+    std::chrono::seconds _delay;
+
+    /**
+     * @brief The Timer object used to handle the delay.
+     */
+    sdeventplus::utility::Timer<sdeventplus::ClockId::Monotonic> _timer;
+};
+
+/**
+ * @class SoftPowerOff
+ *
+ * This class is derived from the PowerOffAction class
+ * and will execute a soft power off after some delay.
+ */
+class SoftPowerOff : public PowerOffAction
+{
+  public:
+    SoftPowerOff() = delete;
+    ~SoftPowerOff() = default;
+    SoftPowerOff(const SoftPowerOff&) = delete;
+    SoftPowerOff& operator=(const SoftPowerOff&) = delete;
+    SoftPowerOff(SoftPowerOff&&) = delete;
+    SoftPowerOff& operator=(SoftPowerOff&&) = delete;
+
+    /**
+     * @brief Constructor
+     *
+     * @param[in] delay - The amount of time in seconds to wait before
+     *                    doing the power off
+     * @param[in] powerInterface - The object to use to do the power off
+     */
+    SoftPowerOff(uint32_t delay,
+                 std::shared_ptr<PowerInterfaceBase> powerInterface) :
+        PowerOffAction("Soft Power Off: " + std::to_string(delay) + "s",
+                       powerInterface),
+        _delay(delay),
+        _timer(_event, std::bind(std::mem_fn(&SoftPowerOff::powerOff), this))
+    {}
+
+    /**
+     * @brief Starts a timer upon the expiration of which the
+     *        soft power off will be done.
+     */
+    void start() override
+    {
+        _timer.restartOnce(_delay);
+    }
+
+    /**
+     * @brief Cancels the timer.  This is always allowed.
+     *
+     * @param[in] force - If the cancel should be forced or not
+     *                    (not checked in this case)
+     * @return bool - Always returns true
+     */
+    bool cancel(bool) override
+    {
+        if (_timer.isEnabled())
+        {
+            _timer.setEnabled(false);
+        }
+
+        // Can always be canceled
+        return true;
+    }
+
+    /**
+     * @brief Performs the soft power off.
+     */
+    void powerOff()
+    {
+        getLogger().log(
+            fmt::format("Action '{}' executing soft power off", name()));
+        _powerIface->softPowerOff();
+    }
+
+  private:
+    /**
+     * @brief The number of seconds to wait between starting the
+     *        action and doing the power off.
+     */
+    std::chrono::seconds _delay;
+
+    /**
+     * @brief The Timer object used to handle the delay.
+     */
+    sdeventplus::utility::Timer<sdeventplus::ClockId::Monotonic> _timer;
+};
+
+/**
+ * @class EpowPowerOff
+ *
+ * Still TODO, but has a cancelable service mode delay followed
+ * by an uncancelable meltdown delay followed by a hard power off, with
+ * some sort of EPOW alert in there as well.
+ */
+class EpowPowerOff : public PowerOffAction
+{
+  public:
+    EpowPowerOff() = delete;
+    ~EpowPowerOff() = default;
+    EpowPowerOff(const EpowPowerOff&) = delete;
+    EpowPowerOff& operator=(const EpowPowerOff&) = delete;
+    EpowPowerOff(EpowPowerOff&&) = delete;
+    EpowPowerOff& operator=(EpowPowerOff&&) = delete;
+
+    EpowPowerOff(uint32_t serviceModeDelay, uint32_t meltdownDelay,
+                 std::shared_ptr<PowerInterfaceBase> powerInterface) :
+        PowerOffAction("EPOW Power Off: " + std::to_string(serviceModeDelay) +
+                           "s/" + std::to_string(meltdownDelay) + "s",
+                       powerInterface),
+        _serviceModeDelay(serviceModeDelay), _meltdownDelay(meltdownDelay)
+    {}
+
+    void start() override
+    {
+        // TODO
+    }
+
+    bool cancel(bool) override
+    {
+        // TODO
+        return true;
+    }
+
+  private:
+    std::chrono::seconds _serviceModeDelay;
+    std::chrono::seconds _meltdownDelay;
+};
+} // namespace phosphor::fan::monitor